Strongly Enhanced Tunneling at Total Charge Neutrality in Double-Bilayer Graphene-WSe_{2} Heterostructures

Physical Review Letters
G William BurgE Tutuc

Abstract

We report the experimental observation of strongly enhanced tunneling between graphene bilayers through a WSe_{2} barrier when the graphene bilayers are populated with carriers of opposite polarity and equal density. The enhanced tunneling increases sharply in strength with decreasing temperature, and the tunneling current exhibits a vertical onset as a function of interlayer voltage at a temperature of 1.5 K. The strongly enhanced tunneling at overall neutrality departs markedly from single-particle model calculations that otherwise match the measured tunneling current-voltage characteristics well, and suggests the emergence of a many-body state with condensed interbilayer excitons when electrons and holes of equal densities populate the two layers.

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Citations

Oct 4, 2019·Nature·Andrey Chaves, David Neilson
Apr 24, 2020·The Journal of Chemical Physics·R J NeedsJ R Trail
Jun 14, 2020·Nature Communications·Sunny GuptaBoris I Yakobson
Nov 9, 2019·Physical Review Letters·Øyvind JohansenRembert A Duine
Jul 9, 2020·Physical Review Letters·Ding ZhangJurgen H Smet
Nov 18, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jinhua WangKamran Behnia

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