769 research outputs found
Tuning correlated electrons in organic quantum materials
No full textOrganic quantum materials feature a large variety of correlated electron phenomena including Mott metal-insulator transition, unconventional superconductivity, Fermi-liquid transport & bad metals as well as frustrated magnetism & quantum spin liquids. These phases result from narrow electronic bandwidth and can be studied by various tools of bandwidth tuning ranging from chemical substitution and hydrostatic pressure to recent advancements in uniaxial strain and doping. Remarkably, in some organic compounds virtually all above mentioned phenomena can be studied even in a single sample as it is tuned through the phase diagram by pressure or strain [1-6].
[1] A. Pustogow, Solids 3, 93–110 (2022).
[2] B. Miksch et al., Science 372, 276-279 (2021).
[3] A. Pustogow et al., Nat. Commun. 14, 1960 (2023).
[4] A. Pustogow et al., Nat. Mater. 17, 773-777 (2018).
[5] A. Pustogow et al., npj Quantum Mater. 6, 9 (2021).
[6] A. Pustogow et al., Nat. Commun. 12, 1571 (2021)
κ-(ET)2Cu2(CN)3: From Spin-Gapped Mott Insulator to Bad Metal
No full textThe Mott metal-insulator transition is among the most broadly investigated phenomena of correlated electron research – especially in geometrically frustrated materials that promise the realization of a quantum-spin-liquid state. The organic charge transfer salt κ-(ET)2Cu2(CN)3 became the most intensely studied genuine Mott system [1] as it is located at a sweet spot in the phase diagram enabling to examine both frustration effects on its magnetic ground state (ambient pressure) [1-3] as well as the insulator-metal transition (1 – 2 kbar pressure) [3-6]. The latter features first-order phase coexistence [5] as well as an enigmatic bad-metal state with resilient quasiparticles arising from a Fermi-liquid ground state [6].
Here, we perform nuclear magnetic resonance (NMR) and dc transport measurements on the chemical substitution series κ-[(ET)1-x(STF)x]2Cu2(CN)3 spanning from the spin-gapped Mott-insulating state (x = 0) [1-3] to the Fermi-liquid and bad metallic region (x → 1) [5,6]. By probing NMR and dc transport on the same samples over a wide range of correlation strength (equivalent to 20 kbar), we obtain deep insight into the breakdown of coherent charge transport with increasing temperature and correlation strength. Our results imply that the deviations from Fermi-liquid behavior – ρ ∝ T2 and temperature-independent (T1T)-1 – in the bad metal are the consequence of steadily reducing quasiparticle weight Z as temperature increases above TFL. Notably, this trend is opposite to oxides, where Z increases with T [7,8].
References
[1] A. Pustogow, Solids 3, 93–110 (2022).
[2] B. Miksch et al., Science 372, 276-279 (2021).
[3] A. Pustogow et al., Nat. Commun. 14, 1960 (2023).
[4] A. Pustogow et al., Nat. Mater. 17, 773-777 (2018).
[5] A. Pustogow et al., npj Quantum Mater. 6, 9 (2021).
[6] A. Pustogow et al., Nat. Commun. 12, 1571 (2021).
[7] X. Deng et al., Phys. Rev. Lett. 113, 246404 (2014).
[8] A. Hunter et al., Phys. Rev. Lett. 131, 236502 (2023)
Strain Tuning of Spin Liquids and Topological Flat Bands: Stress Reduces Frustration
No full textTuning materials properties on demand is at the heart of solid-state physics. Charge transport and magnetism are strongly linked to the overlap of electronic wave functions and can be, thus, manipulated by varying the electronic bandwidth through chemical substitution or physical pressure. Yet, a controlled modification of geometrical frustration of transfer integrals and exchange interactions remained inaccessible so far.
Here, we utilize the recent advancements in strain tuning of unconventional superconductors [1-3] and apply uniaxial stress to a clean kagome-lattice system without disorder [4]. As we break the hexagonal symmetry in a continuous manner, we achieve in situ tuning of antiferromagnetic order within one single crystal through a controlled release of frustration strength [4], see Fig. 1(a). We further apply uniaxial strain to fine-tune the Mott transition with unprecedented precision [5]. Our pioneering endeavors [4,5] demonstrate uniaxial strain as a powerful tool to tweak interacting electrons on frustrated lattices – with the prospect of tuning frustration-induced topological flat bands [Fig. 1(b-d)], e.g. in kagome systems such as Ni3In [6,7], that may be applied to generate ‘green’ energy from metallic thermoelectrics [8].
References
1. C.W. Hicks et al., Science 344, 283 LP (2014).
2. A. Pustogow et al., Nature 574, 72–75 (2019).
3. A. Chronister et al., npj Quantum Mater. 7, 113 (2022).
4. Jierong Wang, Y.-S. Su, M. Spitaler, K.M. Zoch, C. Krellner, P. Puphal, S.E. Brown, and A. Pustogow, Phys. Rev. Lett. 131, 256501 (2023).
5. A. Pustogow, Y. Kawasugi, H. Sakurakoji, N. Tajima, Nat. Commun. 14, 1960 (2023).
6. L. Ye et al., Nat. Phys. 20, 610 (2024).
7. H. J. Kim, M. J. Kim, J. Lee, J. M. Ok, and C.-J. Kang, Phys. Rev. B 110, 024504 (2024).
8. F. Garmroudi, I. Serhiienko, S. Di Cataldo, M. Parzer, A. Riss, M. Grasser, S. Stockinger, S. Khmelevskyi, K. Pryga, B. Wiendlocha, K. Held, T. Mori, E. Bauer, and A. Pustogow, e-print arXiv:2404.0806
SPECTROSCOPY UNDER STRAIN: NEW SPIN ON CORRELATED ELECTRONS
No full textTuning materials properties on demand is at the heart of condensed matter science. Electronic transport and magnetism are strongly linked to the overlap of electronic wave functions and can be, thus, manipulated by varying the electronic bandwidth through chemical substitution or physical pressure. However, a controlled tuning of the symmetry and anisotropy of transfer integrals and exchange interactions remained inaccessible so far.
Here, we apply unidirectional compression and tension to single crystalline samples to explore systems with strong electronic interactions. In our studies of the unconventional superconductor Sr2RuO4 [1-3] uniaxial strain enabled us to reveal even-parity Cooper pairing, thus ruling out spin-triplet superconductivity after more than two decades of intense studies on this material. In particular the strong increase of Tc upon uniaxial compression goes hand in hand with an enhanced upper critical field, which allowed us to obtain more precise NMR data of the superconducting state that eventually overturned previous highly cited results [4].
Following that, we utilized the recent advancements in strain tuning and applied uniaxial stress to triangular-lattice Mott systems enabling us to tune the metal-insulator transition and unconventional superconductivity with unprecedented precision [5]. This way, we pinpoint the nonmagnetic ground state of one of the hottest quantum-spin-liquid candidates through the slope of its metal-insulator boundary in the temperature-pressure phase diagram [5-7]. Apart from tuning the electronic correlation strength, uniaxial strain is a powerful tool to manipulate frustrated magnetism, which is particularly relevant in quantum-spin-liquid candidates where geometrical frustration suppresses antiferromagnetic order down to very low temperatures TN << J [8] or entirely [5-7]. Here we obtain, for the first time, direct control of antiferromagnetic order within a kagome-lattice single crystal by applying in situ uniaxial strain at cryogenic temperatures [8]. Breaking the symmetry in a controlled manner yields a linear increase of TN by 10% as stress reduces the frustration strength, in line with theoretical predictions for a distorted kagome lattice.
Our pioneering endeavors [1-3,5,8] demonstrate uniaxial strain as a powerful tool to tune correlated electrons in situ between insulating, (non)magnetic, metallic and superconducting states – towards stabilizing novel, exotic, possibly even quantum entangled phases.
[1] A. Pustogow, Y. Luo, A. Chronister, Y.-S. Su, D.A. Sokolov, F. Jerzembeck, A.P. Mackenzie, C.W. Hicks, N. Kikugawa, S. Raghu, E.D. Bauer, and S.E. Brown, Nature 574, 72–75 (2019)
[2] Y. Luo, A. Pustogow, P. Guzman, A. P. Dioguardi, S. M. Thomas, F. Ronning, N. Kikugawa, D.A. Sokolov, F. Jerzembeck, A.P. Mackenzie, C.W. Hicks, E.D. Bauer, I.I. Mazin, and S.E. Brown, Phys. Rev. X 9, 021044 (2019)
[3] A. Chronister, M. Zingl, A. Pustogow, Y. Luo, D.A. Sokolov, N. Kikugawa, C.W. Hicks, F. Jerzembeck, J. Mravlje, E.D. Bauer, A.P. Mackenzie, A. Georges, and S.E. Brown, npj Quantum Materials 7, 113 (2022)
[4] K. Ishida, H. Mukuda, Y. Kitaoka, K. Asayama,Z. Q. Mao, Y. Mori, and Y. Maeno, Nature 396, 658-660 (1998)
[5] A. Pustogow, Y. Kawasugi, H. Sakurakoji, and N. Tajima, Nat. Commun. 14, 1960 (2023)
[6] B. Miksch, A. Pustogow, M. Javaheri Rahim, A. A. Bardin, K. Kanoda, J. A. Schlueter, R. Hübner, M. Scheffler, and M. Dressel, Science 372, 276-279 (2021)
[7] A. Pustogow, Solids 3, 93–110 (2022).
[8] Jierong Wang, Y.-S. Su, M. Spitaler, K.M. Zoch, C. Krellner, P. Puphal, S.E. Brown, and A. Pustogow, Phys. Rev. Lett. 131, 256501 (2023
New Spin on Correlated Electrons: Stress Reduces Frustration
No full textTuning materials properties on demand is at the heart of condensed matter science. Electronic transport and magnetism are strongly linked to the overlap of electronic wave functions and can be, thus, manipulated by varying the electronic bandwidth through chemical substitution or physical pressure. Yet, a controlled variation of the symmetry, anisotropy and frustration of transfer integrals and exchange interactions remained inaccessible so far.
Here, we explore Mott insulators subject to strong antiferromagnetic interactions, where geometrical frustration suppresses magnetic order entirely [1] or down to very low temperatures TN << J [2]. Utilizing the recent advancements in strain tuning of unconventional superconductors [3-6], we apply uniaxial stress to tune the Mott transition and unconventional superconductivity of a triangular-lattice compound in fine steps with unprecedented precision. Through the slope of the metal-insulator boundary in the temperature-pressure phase diagram we pinpoint the nonmagnetic ground state of the most intensely studied quantum-spin-liquid candidate [1,7]. Moreover, we obtain direct control of antiferromagnetic order within one single crystal by applying in situ uniaxial pressure to a kagome-lattice compound [2]. As the applied stress reduces the frustration strength, the transition temperature is enhanced by 10%. Our pioneering endeavors demonstrate uniaxial strain as a powerful tool to tune correlated electrons between insulating, (non)magnetic, metallic and superconducting states – towards stabilizing novel, exotic, possibly even quantum entangled phases.
[1] A. Pustogow, Y. Kawasugi, H. Sakurakoji, and N. Tajima, Nat. Commun. 14, 1960 (2023)
[2] Jierong Wang, Y.-S. Su, M. Spitaler, K.M. Zoch, C. Krellner, P. Puphal, S.E. Brown, and A. Pustogow, Phys. Rev. Lett. 131, 256501 (2023)
[3] C.W. Hicks, D.O. Brodsky, E.A. Yelland, A.S. Gibbs, J.A.N. Bruin, M.E. Barber, S.D. Edkins, K. Nishimura, S. Yonezawa, Y. Maeno, & A.P. Mackenzie, Science 344, 283 LP (2014)
[4] Y. Luo, A. Pustogow, P. Guzman, A. P. Dioguardi, S. M. Thomas, F. Ronning, N. Kikugawa, D. A. Sokolov, F. Jerzembeck, A. P. Mackenzie, C.W. Hicks, E. D. Bauer, I. I. Mazin, and S. E. Brown, Phys. Rev. X 9, 021044 (2019)
[5] A. Pustogow, Y. Luo, A. Chronister, Y.-S. Su, D. A. Sokolov, F. Jerzembeck, A. P. Mackenzie, C. W. Hicks, N. Kikugawa, S. Raghu, E. D. Bauer, and S. E. Brown, Nature 574, 72–75 (2019)
[6] A. Chronister, M. Zingl, A. Pustogow, Y. Luo, D. A. Sokolov, N. Kikugawa, C. W. Hicks, F. Jerzembeck, J. Mravlje, E. D. Bauer, A. P. Mackenzie, A. Georges, and S. E. Brown, npj Quantum Materials 7, 113 (2022)
[7] B. Miksch, A. Pustogow, M. Javaheri Rahim, A. A. Bardin, K. Kanoda, J. A. Schlueter, R. Hübner, M. Scheffler, and M. Dressel, Science 372, 276-279 (2021
New Spin on Correlated Electron Systems: Stress Reduces Frustration
No full textTuning materials properties on demand is at the heart of condensed matter science. Charge transport and magnetism are strongly linked to the overlap of electronic wave functions and can be, thus, manipulated by varying the electronic bandwidth through chemical substitution or physical pressure. Yet, a controlled variation of the symmetry, anisotropy and frustration of transfer integrals and exchange interactions remained inaccessible so far.
Here, we explore Mott insulators subject to strong antiferromagnetic interactions, where geometrical frustration suppresses magnetic order entirely [1,2] or down to very low temperatures TN << J [4,7]. Utilizing the recent advancements in strain tuning of unconventional superconductors [8,9], we apply uniaxial stress to fine-tune the Mott transition with unprecedented precision in a triangular-lattice compound [2]. Through the slope of the metal-insulator boundary in the temperature-pressure phase diagram we pinpoint the nonmagnetic ground state of the most intensely studied quantum-spin-liquid candidate [1-3]. By applying in situ uniaxial pressure to a clean, well-studied kagome-lattice compound without disorder [4-6], we obtain direct control of antiferromagnetic order within one single crystal [7]. As the applied stress reduces the frustration strength, TN is enhanced by 10% [7]. Our pioneering endeavors [2,7] demonstrate uniaxial strain as a powerful tool to tune interacting spins on frustrated lattices – towards stabilizing novel, exotic, possibly even quantum entangled spin states.
[1] B. Miksch, A. Pustogow, M. Javaheri Rahim, A. A. Bardin, K. Kanoda, J. A. Schlueter, R. Hübner, M. Scheffler, M. Dressel, Science 372, 276-279 (2021)
[2] A. Pustogow, Y. Kawasugi, H. Sakurakoji, N. Tajima, Nat. Commun. 14, 1960 (2023)
[3] Y. Kawasugi, S. Yamazaki, A. Pustogow, N. Tajima, J. Phys. Soc. Jpn. 92, 065001 (2023)
[4] P. Puphal, M. Bolte, D. Sheptyakov, A. Pustogow, K. Kliemt, M. Dressel, M. Baenitz, C. Krellner, J. Mater. Chem. C 5, 2629 (2017)
[5] T. Biesner et al., Adv. Quantum Technol. 2022, 2200023 (2022)
[6] D. Chatterjee et al., Phys. Rev. B 107, 125156 (2023)
[7] Jierong Wang, Y.-S. Su, M. Spitaler, K.M. Zoch, C. Krellner, P. Puphal, S.E. Brown, and A. Pustogow, Phys. Rev. Lett. 131, 256501 (2023)
[8] C.W. Hicks et al., Science 344, 283 LP (2014)
[9] A. Chronister et al., npj Quantum Mater. 7, 113 (2022
Strain Tuning of Correlated Electrons: Stress Reduces Frustration
No full textTuning materials properties on demand is at the heart of condensed matter science. Magnetism and charge transport are strongly linked to the overlap of electronic wave functions and can be, thus, manipulated by varying the electronic bandwidth through chemical substitution or physical pressure. Yet, a controlled modification of geometrical frustration of transfer integrals and exchange interactions remained inaccessible so far.
Here, we utilize the recent advancements in strain tuning of unconventional superconductors [1-3] and apply uniaxial stress to a clean kagome-lattice system without disorder [4]. As we break the hexagonal symmetry in a continuous manner, we achieve in situ tuning of antiferromagnetic order within one single crystal through a controlled release of frustration strength [4]. We further apply uniaxial strain to fine-tune a metal-insulator transition with unprecedented precision in a frustrated Mott insulator [5]. Our pioneering endeavors [4,5] demonstrate uniaxial strain as a powerful tool to tweak interacting electrons on frustrated lattices – with the potential of tuning frustration-induced topological flat-band systems [6,7], that may be applied in near future to generate ‘green’ energy in metallic thermoelectrics [8].
[1] C.W. Hicks et al., Science 344, 283 LP (2014)
[2] A. Pustogow et al., Nature 574, 72–75 (2019)
[3] A. Chronister et al., npj Quantum Mater. 7, 113 (2022)
[4] Jierong Wang, Y.-S. Su, M. Spitaler, K.M. Zoch, C. Krellner, P. Puphal, S.E. Brown, and A. Pustogow, Phys. Rev. Lett. 131, 256501 (2023)
[5] A. Pustogow, Y. Kawasugi, H. Sakurakoji, N. Tajima, Nat. Commun. 14, 1960 (2023)
[6] L. Ye et al., Nat. Phys. 20, 610 (2024)
[7] H. J. Kim, M. J. Kim, J. Lee, J. M. Ok, and C.-J. Kang, Phys. Rev. B 110, 024504 (2024)
[8] F. Garmroudi, I. Serhiienko, S. Di Cataldo, M. Parzer, A. Riss, M. Grasser, S. Stockinger, S. Khmelevskyi, K. Pryga, B. Wiendlocha, K. Held, T. Mori, E. Bauer, and A. Pustogow, arXiv:2404.0806
Magnetoelastic Coupling and Terahertz Magnetometry of Kagome Systems
Get PDFThe quest for quantum spin liquids has triggered intense investigations on frustrated magnetic systems, resulting in the synthesis of various layered materials with triangular, honeycomb or kagome lattices. Among the
latter, herbertsmithite and its analogues were studied in minute detail by various magnetic probes. While optical measurements are primarily sensitive to the charge degrees of freedom, valuable information can be obtained on magnetoelastic coupling and low-energy spin excitations. Here, we performed comprehensive infrared and THz studies on several paradigmatic kagome compounds. Our work on ZnCu3(OH)6Cl2 – a copper hydroxide system with a charge transfer gap of 3.3 eV [1,2] – revealed pronounced nonthermal redshifts
and broadening specifically for phonon modes that deform the kagome layer or affect the Cu-O-Cu bond angles [3]. Via this strong spin-lattice coupling, sketched in Fig. 1(a), we utilize lattice vibrations as a probe of the magnetic
ground state. Similar effects are observed in the closely related Y3Cu9(OH)19Cl8, where our time-domain THz experiments (Fig. 1b) access the spin density of states (SDOS) over the entire Brillouin zone through three-center magnon excitations. This mechanism is aided by the three different magnetic sublattices and strong short-range correlations in the distorted kagome lattice, in excellent agreement with linear spin-wave theory. Relaxing the
conventional zone-center constraint of photons provides a new aspect to probe magnetism in matter. Lately, we have also observed magnetic THz resonances in the paramagnetic state of the newly synthesized averievite Cu5−xZnxV2O10(CsCl), where Cu2+ kagome layers are sandwiched between honeycomb planes consisting of V and Cu [4]. This comparison allows a direct probe of the different contributions from magnetic order, frustration, and structural properties in the phase diagram of averievite. Overall, our results illustrate the
effect of magnetic interactions in THz spectra of various frustrated magnets.
[1] P. Puphal, M. Bolte, D. Sheptyakov, A. Pustogow, K. Kliemt, M. Dressel, M. Baenitz, and C. Krellner, J. Mater. Chem. C 5, 2629 (2017).
[2] A. Pustogow, Ying Li, I. Voloshenko, P. Puphal, C. Krellner, I. I. Mazin, M. Dressel, and R. Valentí, Phys. Rev. B 96, 241114(R) (2017).
[3] Ying Li, A. Pustogow, M. Bories, P. Puphal, C. Krellner, M. Dressel, and R. Valentí, Phys. Rev. B 101, 161115(R) (2020). [Editors’ Suggestion]
[4] T. Biesner, S. Roh, A. Razpopov, J. Willwater, S. Süllow, Y. Li, K. M. Zoch, M. Medarde, J. Nuss, D. Gorbunov, Y. Skourski, A. Pustogow, S. E. Brown, C. Krellner, R. Valentí, P. Puphal, and M. Dressel, Adv. Quantum Technol. 2022, 2200023 (2022).
[5] T. Biesner, S. Roh, A. Pustogow, H. Zheng, J. F. Mitchell, and M. Dressel, Phys. Rev. B 105, L060410 (2022)
Kagome Optics Under Pressure
No full textTuning materials properties on demand is at the heart of solid-state physics [1]. Charge transport and magnetism are strongly linked to the overlap of electronic wave functions and can be, thus, manipulated by varying the electronic bandwidth through chemical substitution or physical pressure. Yet, a controlled modification of geometrical frustration of transfer integrals and exchange interactions remained inaccessible so far.
Here, we tune kagome frustration in two distinct directions by pressure and strain in the clean quantum spin system Y3Cu9(OH)19)Cl8 without disorder [2]. As we break the hexagonal symmetry in a continuous manner through in-plane uniaxial strain – in situ within one single crystal – we revive antiferromagnetic order through a controlled release of frustration [3]. Vice versa, we increase frustration by applying hydrostatic pressure which suppresses antiferromagnetic order entirely – establishing a major step forward towards ultimately stabilizing a real quantum spin liquid [4]. Based on our comprehensive optical characterizations of charge excitations and magnetoelastic coupling [5,6], we reveal the absence of any structural transition by probing optical phonon modes under pressure [4].
Our pioneering endeavors [3,4] demonstrate spectroscopy under pressure and strain as powerful tools to tweak interacting electrons on frustrated lattices – with the prospect of tuning frustration-induced topological flat bands in kagome metals and other exotic phenomena.
References
[1] D. N. Basov, R. D. Averitt, and D. Hsieh, Nat. Mater. 16, 1077–1088 (2017).
[2] P. Puphal, M. Bolte, D. Sheptyakov, A. Pustogow, K. Kliemt, M. Dressel, M. Baenitz, and C. Krellner, J. Mater. Chem. C 5, 2629 (2017).
[3] Jierong Wang, Y.-S. Su, M. Spitaler, K.M. Zoch, C. Krellner, P. Puphal, S.E. Brown, and A. Pustogow, Phys. Rev. Lett. 131, 256501 (2023).
[4] D. Chatterjee, P. Doležal, F. Abbruciati, T. Biesner, K. M. Zoch, R. Khasanov, S. Sohel Islam, G. Kaur, S. Roh, F. Capitani, G. Garbarino, C. Krellner, P. Mendels, E. Kermarrec, M. Dressel, B. Wehinger, A. Pustogow, F. Bert, and P. Puphal, arXiv:2502.09733.
[5] A. Pustogow, Ying Li, I. Voloshenko, P. Puphal, C. Krellner, I. I. Mazin, M. Dressel, and R. Valentí, Phys. Rev. B 96, 241114(R) (2017).
[6] P. Doležal, T. Biesner, Y. Li, R. Mathew Roy, S. Roh, R. Valentí, M. Dressel, P. Puphal, and A. Pustogow, Phys. Rev. B 110, 174445 (2024)
New Spin on Electrons in Solids: Stress Reduces Frustration
No full textTuning materials properties on demand is at the heart of condensed matter science. Electronic transport and magnetism are strongly linked to the overlap of electronic wave functions and can be, thus, manipulated by varying the electronic bandwidth through chemical substitution or physical pressure. However, a controlled tuning of the symmetry and anisotropy of transfer integrals and exchange interactions remained inaccessible so far. Here, we apply compression and tension to single crystalline samples to explore systems with strong electronic interactions.
Geometrical frustration suppresses magnetic order down to very low temperatures TN << J [1] or entirely [2,3]. Utilizing the recent advancements in strain tuning of the unconventional superconductor Sr2RuO4 [4-6], we apply uniaxial stress to a triangular-lattice compound enabling us to tune the Mott transition and unconventional superconductivity with unprecedented precision. This way, we pinpoint the nonmagnetic ground state of one of the hottest quantum-spin-liquid candidates through the slope of its metal-insulator boundary in the temperature-pressure phase diagram [2,3]. Moreover, we obtain direct control of antiferromagnetic order within one kagome-lattice single crystal by applying in situ uniaxial strain [2]. Breaking the symmetry in a controlled manner yields a linear increase of TN by 10% as stress reduces the frustration strength, in line with theoretical predictions for a distorted kagome lattice. Our pioneering endeavors [1,2,5-7] demonstrate uniaxial strain as a powerful tool to tune correlated electrons in situ between insulating, (non)magnetic, metallic and superconducting states – towards stabilizing novel, exotic, possibly even quantum entangled phases.
In the end, I provide a glimpse into utilization of bandwidth tuning in the applied physics: we achieved a new world record in thermoelectric power factor in NiAu alloys by tuning electronic interband scattering through negative chemical pressure [8].
[1] Jierong Wang, Y.-S. Su, M. Spitaler, K.M. Zoch, C. Krellner, P. Puphal, S.E. Brown, and A. Pustogow, Phys. Rev. Lett. 131, 256501 (2023)
[2] A. Pustogow, Y. Kawasugi, H. Sakurakoji, and N. Tajima, Nat. Commun. 14, 1960 (2023)
[3] B. Miksch, A. Pustogow, M. Javaheri Rahim, A. A. Bardin, K. Kanoda, J. A. Schlueter, R. Hübner, M. Scheffler, and M. Dressel, Science 372, 276-279 (2021)
[5] Y. Luo, A. Pustogow, P. Guzman, A. P. Dioguardi, S. M. Thomas, F. Ronning, N. Kikugawa, D. A. Sokolov, F. Jerzembeck, A. P. Mackenzie, C.W. Hicks, E. D. Bauer, I. I. Mazin, and S. E. Brown, Phys. Rev. X 9, 021044 (2019)
[6] A. Pustogow, Y. Luo, A. Chronister, Y.-S. Su, D. A. Sokolov, F. Jerzembeck, A. P. Mackenzie, C. W. Hicks, N. Kikugawa, S. Raghu, E. D. Bauer, and S. E. Brown, Nature 574, 72–75 (2019)
[7] A. Chronister, M. Zingl, A. Pustogow, Y. Luo, D. A. Sokolov, N. Kikugawa, C. W. Hicks, F. Jerzembeck, J. Mravlje, E. D. Bauer, A. P. Mackenzie, A. Georges, and S. E. Brown, npj Quantum Materials 7, 113 (2022)
[8] F. Garmroudi, M. Parzer, A. Riss, C. Bourgès, S. Khmelevskyi, T. Mori, E. Bauer, and A. Pustogow, Sci. Adv. 9, abc123456 (2023
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