Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session D66: Unconventional States and Excitations in the Fractional Quantum Hall Effect
2:30 PM–5:30 PM,
Monday, March 2, 2020
Room: Four Seasons 1
Sponsoring
Unit:
DCMP
Chair: Steven Kivelson, Stanford Univ
Abstract: D66.00001 : Precursors to Exciton Condensation in Quantum Hall Bilayers*
Presenter:
James Eisenstein
(physics, Caltech)
Authors:
James Eisenstein
(physics, Caltech)
Loren Pfeiffer
(electrical engineering, Princeton)
Kenneth West
(electrical engineering, Princeton)
In spite of this long history, the nature of the quantum phase transition between the incoherent phase at large layer separation and the coherent excitonic phase at small separations remains poorly understood. In this talk I will report on recent experiments which shed new light on the transition. In particular, I will discuss tunneling spectroscopy measurements which reveal evidence for interlayer electron-hole correlations at layer separations near, but above, the transition to the exciton condensate at total Landau level filling νT=1. These correlations are manifested by a nonlinear suppression of the Coulomb pseudogap which inhibits low energy interlayer tunneling in weakly coupled bilayers. The pseudogap suppression is strongest at νT=1 and grows rapidly as the critical layer separation for exciton condensation is approached from above. These and other observations suggest that electron-hole pairing fluctuations exist in the incoherent phase well above the critical layer separation, in a manner reminiscent of Cooper pair fluctuations above the superconducting critical temperature.
*This work was supported by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center, the Gordon and Betty Moore Foundation through Grants GBMF1250 and GBMF4420, and the NSF via MRSEC Grant No. 1420541.
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