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Title: Tunnel transport and interlayer excitons in bilayer fractional quantum Hall systems

Journal Article · · Physical Review B
 [1];  [1];  [2]
  1. The Pennsylvania State Univ., University Park, PA (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
+ Show Author Affiliations

In a bilayer system consisting of a composite-fermion Fermi sea in each layer, the tunnel current is exponentially suppressed at zero bias, followed by a strong peak at a finite bias voltage Vmax. This behavior, which is qualitatively different from that observed for the electron Fermi sea, provides fundamental insight into the strongly correlated non-Fermi liquid nature of the CF Fermi sea and, in particular, offers a window into the short-distance high-energy physics of this highly non-trivial state. We identify the exciton responsible for the peak current and provide a quantitative account of the value of Vmax. The excitonic attraction is shown to be quantitatively significant, and its variation accounts for the increase of Vmax with the application of an in-plane magnetic field. Here, we also estimate the critical Zeeman energy where transition occurs from a fully spin polarized composite fermion Fermi sea to a partially spin polarized one, carefully incorporating corrections due to finite width and Landau level mixing, and find it to be in satisfactory agreement with the Zeeman energy where a qualitative change has been observed for the onset bias voltage. For fractional quantum Hall states, we predict a substantial discontinuous jump in Vmax when the system undergoes a transition from a fully spin polarized state to a spin singlet or a partially spin polarized state.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0005042
OSTI ID:
1489115
Alternate ID(s):
OSTI ID: 1355070
Journal Information:
Physical Review B, Vol. 95, Issue 19; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (2)

Single interface effects dominate in exciton-condensate/normal-barrier/exciton-condensate (EC/N/EC) structures of long-barrier journal August 2018
Crystallization in the Fractional Quantum Hall Regime Induced by Landau-level Mixing text January 2018

Figures / Tables (14)

FIG. 1.(p. 2)figure FIG. 1.
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FIG. 3.(p. 5)figure FIG. 3.
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FIG. 7.(p. 9)figure FIG. 7.
FIG. 8.(p. 10)figure FIG. 8.
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FIG. 12.(p. 12)figure FIG. 12.
FIG. 13.(p. 12)figure FIG. 13.
FIG. 14.(p. 13)figure FIG. 14.

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
bilayer exciton
Coulomb gap