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Title: Electrical band flattening, valley flux, and superconductivity in twisted trilayer graphene

Abstract

Twisted graphene multilayers have been demonstrated to yield a versatile playground to engineer controllable electronic states. Here, by combining first-principles calculations and low-energy models, we demonstrate that twisted graphene trilayers provide a tunable system where Van Hove singularities can be controlled electrically. In particular, it is shown that besides the band flattening, bulk valley currents appear, which can be quenched by local chemical dopants. We finally show that in the presence of electronic interactions, a nonuniform superfluid density emerges whose nonuniformity gives rise to spectroscopic signatures in dispersive higher-energy bands. Our results put forward twisted trilayers as a tunable van der Waals heterostructure displaying electrically controllable flat bands and bulk valley currents.

Authors:
; ORCiD logo
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); Academy of Finland
OSTI Identifier:
1659549
Alternate Identifier(s):
OSTI ID: 1726207
Report Number(s):
LA-UR-20-23775
Journal ID: ISSN 2643-1564; 033357
Grant/Contract Number:  
89233218CNA000001; 331342; 336243
Resource Type:
Published Article
Journal Name:
Physical Review Research
Additional Journal Information:
Journal Name: Physical Review Research Journal Volume: 2 Journal Issue: 3; Journal ID: ISSN 2643-1564
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; impurities; superconductivity; graphene; topological materials; van der Waals systems; density functional theory; tight-binding model

Citation Formats

Lopez-Bezanilla, Alejandro, and Lado, J. L. Electrical band flattening, valley flux, and superconductivity in twisted trilayer graphene. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevresearch.2.033357.
Lopez-Bezanilla, Alejandro, & Lado, J. L. Electrical band flattening, valley flux, and superconductivity in twisted trilayer graphene. United States. https://doi.org/10.1103/physrevresearch.2.033357
Lopez-Bezanilla, Alejandro, and Lado, J. L. Thu . "Electrical band flattening, valley flux, and superconductivity in twisted trilayer graphene". United States. https://doi.org/10.1103/physrevresearch.2.033357.
@article{osti_1659549,
title = {Electrical band flattening, valley flux, and superconductivity in twisted trilayer graphene},
author = {Lopez-Bezanilla, Alejandro and Lado, J. L.},
abstractNote = {Twisted graphene multilayers have been demonstrated to yield a versatile playground to engineer controllable electronic states. Here, by combining first-principles calculations and low-energy models, we demonstrate that twisted graphene trilayers provide a tunable system where Van Hove singularities can be controlled electrically. In particular, it is shown that besides the band flattening, bulk valley currents appear, which can be quenched by local chemical dopants. We finally show that in the presence of electronic interactions, a nonuniform superfluid density emerges whose nonuniformity gives rise to spectroscopic signatures in dispersive higher-energy bands. Our results put forward twisted trilayers as a tunable van der Waals heterostructure displaying electrically controllable flat bands and bulk valley currents.},
doi = {10.1103/physrevresearch.2.033357},
journal = {Physical Review Research},
number = 3,
volume = 2,
place = {United States},
year = {2020},
month = {9}
}

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