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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20231109T110000
DTEND;TZID=Europe/Paris:20231109T120000
DTSTAMP:20231103T202900
UID:MEC-6adbe8b2ab3a52e619c526eff905468a@lps.u-psud.fr
CREATED:20231103
LAST-MODIFIED:20231103
PRIORITY:5
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SUMMARY:A.PTOK: Electronic band structure – Experimental observations v. theoretical calculations
DESCRIPTION:\n            Angle-resolved photoemission spectroscopy (ARPES) gives the opportunity to directly study the electronic band structure. The ARPES spectra can usually be well reproduced by ab-initio (DFT) calculations. I will present our recent investigations of the electronic band structure for several compounds where this does not seem to be the case.\n\n\n\nFirst, I will discuss half-Heusler compounds, which can possess non-trivial topological features similar to those observed in HgTe/CdTe, in particular YPdBi/YPtBi as an example of a trivial/topological compound [1]. Next, I will discuss electronic band structure of GdTe3 antiferromagnet, with charge density wave (CDW). A large difference between theoretical and experimental results uncovers directly the momentum-dependent CDW gap [2]. Finally, I will discuss the electronic band structure of an altermagnetic system. Altermagnets, as a third “new” elementary class of crystal with a collinear magnetic order, exhibit unconventional alternating spin-polarization and time-reversal-symmetry breaking in their band structure without magnetization. As an example I’ll discuss RuO3, where spin-polarized ARPES can be used as to test for existence of altermagnetism [3].\n\n\n\n[1] “Tuning the topological character of half-Heusler systems YTBi (T=Pd, Pt)”,\n\n\n\nJ. C. Souza, M. V. Ale Crivillero, H. Dawczak-Debicki, A. Ptok, P. G. Pagliuso, and S. Wirth, Physical Review B 108, 165154 (2023).\n\n\n\n[2] “Observation of momentum-dependent charge density wave gap in a layered antiferromagnet GdTe3”,\n\n\n\nS. Regmi, I. Bin Elius, A. P. Sakhya, D. Jeff, M. Sprague, M. I. Mondal, D. Jarrett, N. Valadez, A. Agosto, T. Romanova, J.-H. Chu, S. I. Khondaker, A. Ptok, D. Kaczorowski, and M. Neupane, Scientific Reports 13, 18618 (2023).\n\n\n\n[3] “Ruthenium dioxide RuO2: effect of the altermagnetism on the physical properties”,\n\n\n\nA. Ptok, arXiv:2309.02421.\n
URL:https://www.lps.u-psud.fr/en/events/a-ptok-electronic-band-structure-experimental-observations-v-theoretical-calculations/
CATEGORIES:Condensed Matter Theory Seminar
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