215 research outputs found
Interlocked attosecond pulse trains in slightly bi-elliptical high harmonic generation
No full textAbstractThe ellipticity of high harmonics driven by bi-chromatic (e.g. ω−2ω) co-propagating fields can be fully tuned by varying the polarization of the pump components. In order to start revealing the underlying mechanism of this control, we explore a relatively simple regime of this scheme that still gives rise to full control over the harmonics ellipticities. In this regime, the pumps are only slightly elliptical and the high harmonic radiation consists of two (different) interlocked attosecond pulse trains (APTs). We formulate a semi-analytic model that maps the high harmonic ellipticity to properties of the APTs harmonic decompositions. Utilizing this model, we reconstruct these APTs variables from measurements of the high harmonics ellipticities. This ellipticity-resolved spectroscopy of interlocked APTs may be useful for ultrafast probing of chiral degrees of freedom
Dataset for "selection rules in symmetry-broken systems by symmetries in synthetic dimensions"
No full text<p>Data for the article "Selection rules in symmetry-broken systems by symmetries in synthetic dimensions" by Matan Even Tzur, Ofer Neufeld, Eliyahu Bordo, Avner Fleischer, and Oren Cohen.</p>
Ofer Ben-Amots' solo piano works and song cycles
No full textThis thesis builds upon the author's previous bachelor's thesis and expands the mapping and analysis of the compositional oeuvre of Ofer Ben-Amots. Following a comprehensive examination of his choral and operatic works, the thesis focuses on solo piano compositions and song cycles with piano accompaniment. The author delves into interpretative challenges and explores specific musical techniques employed by the composer in his creative process. Furthermore, the thesis aims to raise awareness of Ofer Ben-Amots' work among the general public. Key words Ofer Ben-Amots, jewish music, contemporary music, piano works, song cycles, interpretation, analysi
Are there universal signatures of topological phases in high harmonic generation? Probably not
Full text linkHigh harmonic generation (HHG) has developed in recent years as a promising
tool for ultrafast materials spectroscopy. At the forefront of these
advancements, several works proposed to use HHG as an all-optical probe for
topology of quantum matter by identifying its signatures in the emission
spectra. However, it remains unclear if such spectral signatures are indeed a
robust and general approach for probing topology. To address this point, we
perform here a fully ab-initio study of HHG from prototypical two-dimensional
topological insulators in the Kane-Mele quantum spin-Hall and anomalous-Hall
phases. We analyze the spectra and previously proposed topological signatures
by comparing HHG from the topological and trivial phases. We demonstrate and
provide detailed microscopic explanations of why in these systems none of the
thus far proposed observables uniquely and universally probe material topology.
Specifically, we find that the: (i) HHG helicity, (ii) anomalous HHG
ellipticity, (iii) HHG elliptical dichroism and (iv) temporal delays in HHG
emission, are all unreliable signatures of topological phases. Our results
suggest that extreme care must be taken when interpreting HHG spectra for
topological signatures, and that contributions from the crystal symmetries and
chemical nature might be dominant over those from topology. They hint that a
truly universal topological signature in nonlinear optics is unlikely, and
raise important questions regarding possible utilization and detection of
topology in systems out-of-equilibrium.Comment: 24 figures including appendice
Jazz Diasporas: Race, Music, and Migration in Post-World War II ParisJazz Diaspora: Music and Globalisation
No full textThis review examines two recent monographs that explore the concept of "jazz diaspora/s": Rashida Braggs’s Jazz Diasporas: Race, Music, and Migration in Post-World War II Paris and Bruce Johnson’s Jazz Diaspora: Music and Globalisation. While both authors engage with the term, they use it in distinct and sometimes contradictory ways, especially in terms of its theoretical implications for jazz scholarship and its global significance. By highlighting their approaches to power and identity, this review clarifies how each author contributes to understanding jazz as both an African diasporic music and a global phenomeno
Ofer Ben-Amots' solo piano works and song cycles
Full text linkDiplomová práce navazuje na bakalářskou práci téže autorky a rozvíjí mapování a analýzu skladatelského díla Ofera Ben-Amotse. Po důkladném zpracování jeho sborové a operní tvorby se práce soustředí na sólové klavírní skladby a písňové cykly s klavírním doprovodem. Autorka se zaměřuje na interpretační výzvy a hledá specifické hudební prostředky, které skladatel při své tvorbě využívá. Práce si rovněž klade za cíl dostat dílo Ofera Ben-Amotse do širšího povědomí široké veřejnosti. Klíčová slova Ofer Ben-Amots, židovská hudba, soudobá hudba, sólová klavírní tvorba, písňové cykly, interpretace, analýzaThis thesis builds upon the author's previous bachelor's thesis and expands the mapping and analysis of the compositional oeuvre of Ofer Ben-Amots. Following a comprehensive examination of his choral and operatic works, the thesis focuses on solo piano compositions and song cycles with piano accompaniment. The author delves into interpretative challenges and explores specific musical techniques employed by the composer in his creative process. Furthermore, the thesis aims to raise awareness of Ofer Ben-Amots' work among the general public. Key words Ofer Ben-Amots, jewish music, contemporary music, piano works, song cycles, interpretation, analysisKatedra hudební výchovyPedagogická fakultaFaculty of Educatio
Probing phonon dynamics with multidimensional high harmonic carrier-envelope-phase spectroscopy
Full text linkWe explore pump-probe high harmonic generation (HHG) from monolayer hexagonal-boron-nitride, where a terahertz pump excites coherent optical phonons that are subsequently probed by an intense infrared pulse that drives HHG. We find, through state-of-the-art ab initio calculations, that the structure of the emission spectrum is attenuated by the presence of coherent phonons and no longer comprises discrete harmonic orders, but rather a continuous emission in the plateau region. The HHG yield strongly oscillates as a function of the pump-probe delay, corresponding to ultrafast changes in the lattice such as specific bond compression or stretching dynamics. We further show that in the regime where the excited phonon period and the pulse duration are of the same order of magnitude, the HHG process becomes sensitive to the carrier-envelope phase (CEP) of the driving field, even though the pulse duration is so long that no such sensitivity is observed in the absence of coherent phonons. The degree of CEP sensitivity versus pump-probe delay is shown to be a highly selective measure for instantaneous structural changes in the lattice, providing an approach for ultrafast multidimensional HHG spectroscopy. Remarkably, the obtained temporal resolution for phonon dynamics is ∼1 femtosecond, which is much shorter than the probe pulse duration because of the inherent subcycle contrast mechanism. Our work paves the way toward routes of probing phonons and ultrafast material structural changes with subcycle temporal resolution and provides a mechanism for controlling the HHG spectrum
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