Photon energy and polarization-dependent electronic structure of Cr-doped Bi2Se3

Yilmaz, T.; Gu, G. D.; Vescovo, E.; Kaznatcheev, K.; Sinkovic, B.

doi:10.1103/PhysRevMaterials.4.024201

Title: Photon energy and polarization-dependent electronic structure of Cr-doped ${Bi}_{2} {Se}_{3}$

Journal Article · 04 February 2020 · Physical Review Materials

DOI: https://doi.org/10.1103/PhysRevMaterials.4.024201 · OSTI ID:1603288

^[1]; Gu, G. D. ^[2]; Vescovo, E. ^[1]; Kaznatcheev, K. ^[1]; Sinkovic, B. ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Univ. of Connecticut, Storrs, CT (United States)

In this article, we report a comparative study of the electronic structure of Cr-doped and pristine Bi₂Se₃. Circular dichroism and photon-energy-dependent angle-resolved photoemission experiments were performed. Even though the surface states seen on the Cr-doped samples are gapped, they exhibit strong circular dichroism, for which we provide its origin in accordance with the nontrivial band structure of the bulk. We note the surface electronic structure measurements with linear and circular polarized light show signatures that the orbital composition of the surface states is changed with Cr doping. Our observations not only provide further spectroscopic information about topological materials, but also promotes an alternative experimental tool to control their spin-orbital texture.

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

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

Grant/Contract Number:: SC0012704

OSTI ID:: 1603288

Report Number(s):: BNL--213681-2020-JAAM

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 2 Vol. 4; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Photon energy and polarization-dependent electronic structure of Cr-doped Bi 2 Se 3

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Title: Photon energy and polarization-dependent electronic structure of Cr-doped ${Bi}_{2} {Se}_{3}$