Emergent flat band electronic structure in a VSe2/Bi2Se3 heterostructure

Yilmaz, Turgut; Tong, Xiao; Dai, Zhongwei; Sadowski, Jerzy T.; Schwier, Eike F.; Shimada, Kenya; Hwang, Sooyeon; Kisslinger, Kim; Kaznatcheev, Konstantine; Vescovo, Elio; Sinkovic, Boris

doi:10.1038/s43246-020-00115-w

Title: Emergent flat band electronic structure in a VSe₂/Bi₂Se₃ heterostructure

Journal Article · Wed Jan 20 00:00:00 EST 2021 · Communications Materials

DOI:https://doi.org/10.1038/s43246-020-00115-w· OSTI ID:1777425

^[1]; Tong, Xiao ^[2];

^[2];

^[2]; Schwier, Eike F. ^[3];

^[3]; Hwang, Sooyeon ^[2]; Kisslinger, Kim ^[2]; Kaznatcheev, Konstantine ^[1]; Vescovo, Elio ^[1]; Sinkovic, Boris ^[4]

Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Hiroshima Univ. (Japan)
Univ. of Connecticut, Storrs, CT (United States)

Flat band electronic states are proposed to be a fundamental tool to achieve various quantum states of matter at higher temperatures due to the enhanced electronic correlations. However, materials with such peculiar electronic states are rare and often rely on subtle properties of the band structures. Here, by using angle-resolved photoemission spectroscopy, we show the emergent flat band in a VSe₂ / Bi₂Se₃ heterostructure. Our photoemission study demonstrates that the flat band covers the entire Brillouin zone and exhibits 2D nature with a complex circular dichroism. In addition, the Dirac cone of Bi₂Se₃ is not reshaped by the flat band even though they overlap in proximity of the Dirac point. These features make this flat band distinguishable from the ones previously found. Thereby, the observation of a flat band in the VSe₂ / Bi₂Se₃ heterostructure opens a promising pathway to realize strongly correlated quantum effects in topological materials.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1777425

Report Number(s):: BNL-221249-2021-JAAM

Journal Information:: Communications Materials, Vol. 2, Issue 1; ISSN 2662-4443

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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