Dryad
Published November 5, 2024 | Version v1
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Perfect Coulomb drag and exciton transport in an excitonic insulator

Creators

  • 1. University of California, Berkeley
  • 2. National Institute for Materials Science
  • 3. Arizona State University

Description

Strongly coupled electron-hole bilayers can host quantum states of interlayer excitons, such as high-temperature exciton condensates at zero magnetic field. This state is predicted to feature perfect Coulomb drag, where a current in one layer is accompanied by an equal but opposite current in the other. Here we use an optical technique to probe the electrical transport of correlated electron-hole bilayers based on MoSe2/hBN/WSe2 heterostructures. We observe perfect Coulomb drag in the excitonic insulator phase at low temperatures; the counterflow resistance of interlayer excitons remains finite. These results indicate the formation of an exciton gas that does not condense into a superfluid. Our work demonstrates that dynamic optical spectroscopy provides a powerful tool for probing exciton transport behavior in correlated electron-hole fluids.

Notes

Funding provided by: United States Department of Defense
ROR ID: https://ror.org/0447fe631
Award Number: AFOSR FA9550-23-1-0246

Funding provided by: United States Department of Energy
ROR ID: https://ror.org/01bj3aw27
Award Number: DE-AC02-05-CH11231

Funding provided by: United States Department of Energy
ROR ID: https://ror.org/01bj3aw27
Award Number: SC0020653

Funding provided by: National Science Foundation
ROR ID: https://ror.org/021nxhr62
Award Number: CMMI 1933214

Funding provided by: Japan Society for the Promotion of Science
ROR ID: https://ror.org/00hhkn466
Award Number: 21H05233

Funding provided by: Ministry of Education, Culture, Sports, Science and Technology
ROR ID: https://ror.org/048rj2z13
Award Number:

Funding provided by: Japan Society for the Promotion of Science
ROR ID: https://ror.org/00hhkn466
Award Number: 23H02052

Funding provided by: National Science Foundation
ROR ID: https://ror.org/021nxhr62
Award Number: mid-scale 1935994

Funding provided by: National Science Foundation
ROR ID: https://ror.org/021nxhr62
Award Number: 1904716

Funding provided by: National Science Foundation
ROR ID: https://ror.org/021nxhr62
Award Number: DMR 1552220

Funding provided by: National Science Foundation
ROR ID: https://ror.org/021nxhr62
Award Number: DMR 1955889

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Additional details

Related works

Is source of
10.5061/dryad.vhhmgqp3h (DOI)