Crossover between strongly coupled and weakly coupled exciton superfluids

Liu, Xiaomeng; Li, J. I.  A.; Watanabe, Kenji; Taniguchi, Takashi; Hone, James; Halperin, Bertrand I.; Kim, Philip; Dean, Cory R.

doi:10.1126/science.abg1110

Crossover between strongly coupled and weakly coupled exciton superfluids

Journal Article · 14 January 2022 · Science

DOI:https://doi.org/10.1126/science.abg1110· OSTI ID:1980725

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Department of Physics, Harvard University, Cambridge, MA 02138, USA.
Department of Physics, Brown University, Providence, RI 02912, USA.
Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA.
Department of Physics, Columbia University, New York, NY 10027, USA.

Following a crossover

Superfluidity in fermionic systems occurs through the pairing of fermions into bosons, which can undergo condensation. Depending on the strength of the interactions between fermions, the pairs range from large and overlapping to tightly bound. The crossover between these two limits has been explored in ultracold Fermi gases. Liuet al. observed the crossover in an electronic system consisting of two layers of graphene separated by an insulating barrier and placed in a magnetic field. In this two-dimensional system, the pairs were excitons formed from an electron in one layer and a hole in the other. The researchers used magnetic field and layer separation to tune the interactions and detected the signatures of superfluidity through transport measurements. —JS

Research Organization:: Harvard Univ., Cambridge, MA (United States); Cornell Univ., Ithaca, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0012260; SC0019481

OSTI ID:: 1980725

Journal Information:: Science, Vol. 375, Issue 6577; ISSN 0036-8075

Publisher:: AAAS

Country of Publication:: United States

Language:: English

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