11,148 research outputs found
Many-particle effects in adsorbed magnetic atoms with easy-axis anisotropy: the case of Fe on the CuN/Cu(100) surface
No full textWe study the effects of the exchange interaction between an adsorbed magnetic atom with easy-axis magnetic anisotropy and the conduction-band electrons from the substrate. We model the system using an anisotropic Kondo model and we compute the impurity spectral function, which is related to the differential conductance (dI / dV) spectra measured using a scanning tunneling microscope. To make contact with the known experimental results for iron atoms on the CuN/Cu(100) surface (Hirjibehedin et al 2007 Science 317 1199), we calculated the spectral functions in the presence of an external magnetic field of varying strength applied along all three spatial directions. It is possible to establish an upper bound on the coupling constant J : in the range of the magnetic fields for which the experimental results are currently known (up to 7 T), the low-energy features in the calculated spectra agree well with the measured dI / dV spectra if the exchange coupling constant J is at most half as large as that for cobalt atoms on the same surface. We show that for an even higher magnetic field (between 8 and 9 T) applied along the 'hollow direction', the impurity energy states cross, giving rise to a Kondo effect which takes the form of a zero-bias resonance. The coupling strength J could be determined experimentally by performing tunneling spectroscopy in this range of magnetic fields. On the technical side, the paper introduces an approach for calculating the expectation values of global spin operators and all the components of the impurity magnetic susceptibility tensor (including the out-of-diagonal ones) in numerical renormalization group (NRG) calculations with no spin symmetry. An appendix contains a density functional theory (DFT) study of the Co and Fe adsorbates on the CuN/Cu(100) surface: we compare magnetic moments, as well as orbital energies, occupancies, centers and spreads, by calculating the maximally localized Wannier orbitals of the adsorbates.Slovenian Research Agency (ARRS) [Z1-2058]; DFG [SFB 602
ARPES spectra of the Hubbard model
No full textARPES spectra of the Hubbard model / Th. A. Maier, Th. Pruschke, M. Jarrell. – In: Physical review. B. 66. 2002. 07510
ARPES spectra of the Hubbard model
No full textARPES spectra of the Hubbard model / Th. A. Maier, Th. Pruschke, M. Jarrell. – In: Physical review. B. 66. 2002. 07510
Nonresonant inelastic light scattering in the Hubbard model
No full textNonresonant inelastic light scattering in the Hubbard model / Th. Pruschke ... – In: Physical review. B. 67. 2003. 15510
Phase diagram of the frustrated Hubbard model
No full textPhase diagram of the frustrated Hubbard model / Th. Pruschke ... – In: Physical review letters. 93. 2004. 01640
Phase diagram of the frustrated Hubbard model
No full textPhase diagram of the frustrated Hubbard model / Th. Pruschke ... – In: Physical review letters. 93. 2004. 01640
Semianalytical solution of the Kondo model in a magnetic field
No full textSemianalytical solution of the Kondo model in a magnetic field / Th. Pruschke ... – In: Physical review. B. 67. 2003. 18440
Magnetism and phase saration in the ground state of the Hubbard model
No full textMagnetism and phase saration in the ground state of the Hubbard model / R. Zitzler, Th. Pruschke, R. Bulla. – In: European physical journal. B. 27. 2002. S. 473-48
The physics of quantum impurities – a bridge from micro/nano to macro systems
No full textWe will give a comprehensive introduction into the concept of quantum impurities and survey on where and why quantum impurity problems arise in modem solid-state physics, The physical properties of these systems and their applications will be discussed for a selected set of examples, (c) 2005 WILEY-VCH Verlag Gmbh W Co. KCA, Weinheim
Kondo screening in d-wave superconductors in a Zeeman field and implications for STM spectra of Zn-doped cuprates
No full textKondo screening in d-wave superconductors in a Zeeman field and implications for STM spectra of Zn-doped cuprates / Th. Pruschke ... – In: Physical review. B. 66. 2002. 13452
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