Journal
SCIENCE
Volume 375, Issue 6577, Pages 205-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abg1110
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Funding
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0019481]
- DOE [DE-SC0012260]
- DoD Vannevar Bush Faculty Fellowship [N00014-18-1-2877]
- CREST, JST [JPMJCR15F3]
- ARO MURI [W911NF-14-1-0247]
- Center for Precision-Assembled Quantum Materials (PAQM), a Materials Science and Engineering Research Center (MRSEC) through NSF [DMR-2011738]
- Science and Technology Center for Integrated Quantum Materials, NSF [DMR-1231319]
- NSF [DMR-1644779]
- state of Florida
- NSF NNIN [ECS-00335765]
- MEXT, Japan
- JSPS
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We have studied the transition between two bosonic quantum condensate phases in a solid-state system using magneto-exciton condensates in graphene double layers.
In fermionic systems, superconductivity and superfluidity occur through the condensation of fermion pairs. The nature of this condensate can be tuned by varying the pairing strength, which is challenging in electronic systems. We studied graphene double layers separated by an atomically thin insulator. Under applied magnetic field, electrons and holes couple across the barrier to form bound magneto-excitons whose pairing strength can be continuously tuned by varying the effective layer separation. Using temperature-dependent Coulomb drag and counterflow current measurements, we were able to tune the magneto-exciton condensate through the entire phase diagram from weak to strong coupling. Our results establish magneto-exciton condensates in graphene as a model platform to study the crossover between two bosonic quantum condensate phases in a solid-state system.
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