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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Band inversion and topology of the bulk electronic structure in FeSe0.45Te0.55 Himanshu Lohani , Tamaghna Hazra , Amit Ribak , Yuval Nitzav , Huixia Fu , Binghai Yan , Mohit Randeria , Amit Kanigel Physical Review B 101 DOI: 10.1103/PhysRevB.101.245146 Diamond Proposal Number(s): [15822] Show Abstract ▼ Abstract: FeSe 0.45 Te 0.55 (FeSeTe) has recently emerged as a promising candidate to host topological superconductivity, with a Dirac surface state and signatures of Majorana bound states in vortex cores. However, correlations strongly renormalize the bands compared to electronic structure calculations, and there is no evidence for the expected bulk band inversion. We present here a comprehensive angle resolved photoemission (ARPES) study of FeSeTe as a function of photon energies ranging from 15–100 eV. We find that although the top of the bulk valence band shows essentially no k z dispersion, its normalized intensity exhibits a periodic variation with k z . We show, using ARPES selection rules, that the intensity oscillation is a signature of band inversion indicating a change in the parity going from Γ to Z . We also present a simple realistic tight-binding model which gives insight into ARPES observations. Thus we provide direct evidence for a topologically nontrivial bulk band structure that supports protected surface states.	Jun 2020

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I05-ARPES

Band inversion and topology of the bulk electronic structure in FeSe0.45Te0.55

Himanshu Lohani , Tamaghna Hazra , Amit Ribak , Yuval Nitzav , Huixia Fu , Binghai Yan , Mohit Randeria , Amit Kanigel

Physical Review B 101

DOI: 10.1103/PhysRevB.101.245146

Diamond Proposal Number(s): [15822]

Show Abstract ▼

Jun 2020