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Title: Local, global, and nonlinear screening in twisted double-layer graphene

Abstract

One-atom-thick crystalline layers and their vertical heterostructures carry the promise of designer electronic materials that are unattainable by standard growth techniques. To realize their potential it is necessary to isolate them from environmental disturbances, in particular those introduced by the substrate. However, finding and characterizing suitable substrates, and minimizing the random potential fluctuations they introduce, has been a persistent challenge in this emerging field. Here we show that Landau-level (LL) spectroscopy offers the unique capability to quantify both the reduction of the quasiparticles’ lifetime and the long-range inhomogeneity due to random potential fluctuations. Harnessing this technique together with direct scanning tunneling microscopy and numerical simulations we demonstrate that the insertion of a graphene buffer layer with a large twist angle is a very effective method to shield a 2D system from substrate interference that has the additional desirable property of preserving the electronic structure of the system under study. We further show that owing to its remarkable nonlinear screening capability a single graphene buffer layer provides better shielding than either increasing the distance to the substrate or doubling the carrier density and reduces the amplitude of the potential fluctuations in graphene to values even lower than the ones in AB-stackedmore » bilayer graphene.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Rutgers Univ., New Brunswick, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1255459
Alternate Identifier(s):
OSTI ID: 1348831
Grant/Contract Number:  
FG02-99ER45742
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 113 Journal Issue: 24; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; graphene; STM; screening; Landau-level spectroscopy

Citation Formats

Lu, Chih-Pin, Rodriguez-Vega, Martin, Li, Guohong, Luican-Mayer, Adina, Watanabe, Kenji, Taniguchi, Takashi, Rossi, Enrico, and Andrei, Eva Y. Local, global, and nonlinear screening in twisted double-layer graphene. United States: N. p., 2016. Web. doi:10.1073/pnas.1606278113.
Lu, Chih-Pin, Rodriguez-Vega, Martin, Li, Guohong, Luican-Mayer, Adina, Watanabe, Kenji, Taniguchi, Takashi, Rossi, Enrico, & Andrei, Eva Y. Local, global, and nonlinear screening in twisted double-layer graphene. United States. doi:10.1073/pnas.1606278113.
Lu, Chih-Pin, Rodriguez-Vega, Martin, Li, Guohong, Luican-Mayer, Adina, Watanabe, Kenji, Taniguchi, Takashi, Rossi, Enrico, and Andrei, Eva Y. Thu . "Local, global, and nonlinear screening in twisted double-layer graphene". United States. doi:10.1073/pnas.1606278113.
@article{osti_1255459,
title = {Local, global, and nonlinear screening in twisted double-layer graphene},
author = {Lu, Chih-Pin and Rodriguez-Vega, Martin and Li, Guohong and Luican-Mayer, Adina and Watanabe, Kenji and Taniguchi, Takashi and Rossi, Enrico and Andrei, Eva Y.},
abstractNote = {One-atom-thick crystalline layers and their vertical heterostructures carry the promise of designer electronic materials that are unattainable by standard growth techniques. To realize their potential it is necessary to isolate them from environmental disturbances, in particular those introduced by the substrate. However, finding and characterizing suitable substrates, and minimizing the random potential fluctuations they introduce, has been a persistent challenge in this emerging field. Here we show that Landau-level (LL) spectroscopy offers the unique capability to quantify both the reduction of the quasiparticles’ lifetime and the long-range inhomogeneity due to random potential fluctuations. Harnessing this technique together with direct scanning tunneling microscopy and numerical simulations we demonstrate that the insertion of a graphene buffer layer with a large twist angle is a very effective method to shield a 2D system from substrate interference that has the additional desirable property of preserving the electronic structure of the system under study. We further show that owing to its remarkable nonlinear screening capability a single graphene buffer layer provides better shielding than either increasing the distance to the substrate or doubling the carrier density and reduces the amplitude of the potential fluctuations in graphene to values even lower than the ones in AB-stacked bilayer graphene.},
doi = {10.1073/pnas.1606278113},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 24,
volume = 113,
place = {United States},
year = {2016},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1073/pnas.1606278113

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Cited by: 5 works
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