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Electronic structure and unconventional nonlinear response in double Weyl semimetal SrSi2
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Material- och nanofysik. IFW Dresden, Leibniz Inst Solid State & Mat Res, Helmholtzstr 20, D-01069 Dresden, Germany..ORCID-id: 0000-0002-3980-9208
Rhein Westfal TH Aachen, Inst Theorie Stat Phys, D-52056 Aachen, Germany..
2021 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 104, nr 24, artikkel-id 245122Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Considering a noncentrosymmetric, nonmagnetic double Weyl semimetal (WSM) SrSi2, we investigate the electron and hole pockets in bulk Fermi surface behavior that enables us to characterize the material as a type-I WSM. We study the structural handedness of the material and correlate it with the distinct surface Fermi surface at two opposite surfaces following an energy evolution. The Fermi arc singlet becomes doublet with the onset of spin orbit coupling that is in accordance with the topological charge of the Weyl nodes (WNs). A finite energy separation between WNs of opposite chirality in SrSi2 allows us to compute circular photogalvanic effect (CPGE). Followed by the three band formula, we show that CPGE is only quantized for Fermi level chosen in the vicinity of WN residing at a higher value of energy. Surprisingly, for the other WN of opposite chirality in the lower value of energy, CPGE is not found to be quantized. Such a behavior of CPGE is in complete contrast to the time reversal breaking WSM where CPGE is quantized to two opposite plateau depending on the topological charge of the activated WN. We further analyze our finding by examining the momentum resolved CPGE. Finally we show that two band formula for CPGE is not able to capture the quantization that is apprehended by the three band formula.

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American Physical Society (APS) , 2021. Vol. 104, nr 24, artikkel-id 245122
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URN: urn:nbn:se:kth:diva-307359DOI: 10.1103/PhysRevB.104.245122ISI: 000734384000004Scopus ID: 2-s2.0-85122013041OAI: oai:DiVA.org:kth-307359DiVA, id: diva2:1630927
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QC 20220121

Tilgjengelig fra: 2022-01-21 Laget: 2022-01-21 Sist oppdatert: 2022-06-25bibliografisk kontrollert

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