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Interlayer Interactions and the Fermi Energy of Bilayer Composite Fermion Metals

Eisenstein, J. P. and Pfeiffer, L. N. and West, K. W. (2018) Interlayer Interactions and the Fermi Energy of Bilayer Composite Fermion Metals. Physical Review B, 98 (20). Art. No. 201406. ISSN 2469-9950. doi:10.1103/PhysRevB.98.201406.

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When two two-dimensional electron gas layers, each at Landau-level filling factor ν=1/2, are sufficiently close together, a condensate of interlayer excitons emerges at low temperature. Although the excitonic phase is qualitatively well understood, the incoherent phase just above the critical layer separation is not. Using a combination of tunneling spectroscopy and conventional transport, we explore the incoherent phase in samples both near the phase boundary and further from it. In the more closely spaced bilayers we find the electronic spectral functions narrower and the Fermi energy of the ν=1/2 composite fermion metal smaller than in the more widely separated bilayers. We attribute these effects to a softening of the intralayer Coulomb interaction due to interlayer screening.

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Additional Information:© 2018 American Physical Society. Received 8 June 2018; revised manuscript received 8 July 2018; published 27 November 2018. It is a pleasure to acknowledge helpful discussions with Gil Refael and Jainendra Jain. This work was supported in part by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant No. GBMF1250. The work at Princeton University was funded by the Gordon and Betty Moore Foundation through Grant No. GBMF 4420, and by the National Science Foundation MRSEC Grant No. 1420541.
Group:Institute for Quantum Information and Matter
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Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationGBMF1250
Gordon and Betty Moore FoundationGBMF4420
Issue or Number:20
Record Number:CaltechAUTHORS:20181009-080813831
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90178
Deposited By: Tony Diaz
Deposited On:09 Oct 2018 16:46
Last Modified:16 Nov 2021 03:30

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