Observation of Flat Bands in Gated Semiconductor Artificial Graphene

Du, Lingjie; Liu, Ziyu; Wind, Shalom J.; Pellegrini, Vittorio; West, Ken W.; Fallahi, Saeed; Pfeiffer, Loren N.; Manfra, Michael J.; Pinczuk, Aron

doi:10.1103/physrevlett.126.106402

Title: Observation of Flat Bands in Gated Semiconductor Artificial Graphene

Journal Article · Fri Mar 12 00:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.126.106402· OSTI ID:1850951

Du, Lingjie ^[1];

^[2]; Wind, Shalom J. ^[2]; Pellegrini, Vittorio ^[3]; West, Ken W. ^[4]; Fallahi, Saeed ^[5]; Pfeiffer, Loren N. ^[4]; Manfra, Michael J. ^[5]; Pinczuk, Aron ^[2]

Nanjing Univ. (China); Columbia Univ., New York, NY (United States)
Columbia Univ., New York, NY (United States)
Istituto Italiano di Tecnologia, Genova (Italy)
Princeton Univ., NJ (United States)
Purdue Univ., West Lafayette, IN (United States)

Flat bands near M points in the Brillouin zone are key features of honeycomb symmetry in artificial graphene (AG) where electrons may condense into novel correlated phases. Here we report the observation of van Hove singularity doublet of AG in GaAs quantum well transistors, which presents the evidence of flat bands in semiconductor AG. Two emerging peaks in photoluminescence spectra tuned by backgate voltages probe the singularity doublet of AG flat bands and demonstrate their accessibility to the Fermi level. As the Fermi level crosses the doublet, the spectra display dramatic stability against electron density, indicating interplays between electron-electron interactions and honeycomb symmetry. Our results provide a new flexible platform to explore intriguing flat band physics.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States); Columbia Univ., New York, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0006671; SC0010695

OSTI ID:: 1850951

Journal Information:: Physical Review Letters, Vol. 126, Issue 10; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Physics
van Hove singularity
Honeycomb lattice
Two-dimensional electron gas
Photoluminescence

Title: Observation of Flat Bands in Gated Semiconductor Artificial Graphene

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