期刊
PHYSICAL REVIEW LETTERS
卷 120, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.177702
关键词
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资金
- National Science Foundation [EECS-1610008]
- Nanoelectronics Research Initiative SWAN center
- Army Research Office [W911NF-17-1-0312]
- Elemental Strategy Initiative
- JSPS KAKENHI [JP15K21722]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1610008] Funding Source: National Science Foundation
We report the experimental observation of strongly enhanced tunneling between graphene bilayers through a WSe2 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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