Gap-like feature observed in the non-magnetic topological insulators

Yilmaz, T.; Pertsova, A.; Hines, W.; Vescovo, E.; Kaznatcheev, K.; Balatsky, A. V.; Sinkovic, B.

doi:10.1088/1361-648X/ab6349

Title: Gap-like feature observed in the non-magnetic topological insulators

Journal Article · 08 January 2020 · Journal of Physics. Condensed Matter

DOI: https://doi.org/10.1088/1361-648X/ab6349 · OSTI ID:1604317

; Pertsova, A.; Hines, W.; Vescovo, E.; Kaznatcheev, K.; Balatsky, A. V.; Sinkovic, B.

Non-magnetic gap at the Dirac point of topological insulators remains an open question in the field. Here, we present angle-resolved photoemission spectroscopy experiments performed on Cr-doped Bi₂Se₃ and showed that the Dirac point is progressively buried by the bulk bands and a low spectral weight region in the vicinity of the Dirac point appears. These two mechanisms lead to spectral weight suppression region being mistakenly identified as an energy gap in earlier studies. We further calculated the band structure and found that the original Dirac point splits into two nodes due to the impurity resonant states and the energy separation between the nodes is the low density of state region which appears to be like an energy gap in potoemission experiments. Furthermore, we supported our arguments by presenting photoemission experiments carried out with on- and off- resonant photon energies. Our observation resolves the widely debated questions of apparent energy gap opening at the Dirac point without long range ferromagnetic order in topological insulators.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); University of Connecticut

Grant/Contract Number:: SC0012704

OSTI ID:: 1604317

Report Number(s):: BNL--213701-2020-JAAM

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 14 Vol. 32; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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