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Coulomb Drag and Tunneling Studies in Quantum Hall Bilayers


Nandi, Debaleena (2016) Coulomb Drag and Tunneling Studies in Quantum Hall Bilayers. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Z97H1GG0.


The bilayer quantum Hall state at total filling factor νT=1, where the total electron density matches the degeneracy of the lowest Landau level, is a prominent example of Bose-Einstein condensation of excitons. A macroscopically ordered state is realized where an electron in one layer is tightly bound to a "hole" in the other layer. If exciton transport were the only bulk transportmechanism, a current driven in one layer would spontaneously generate a current of equal magnitude and opposite sign in the other layer. The Corbino Coulomb drag measurements presented in this thesis demonstrate precisely this phenomenon.

Excitonic superfluidity has been long sought in the νT=1 state. The tunneling between the two electron gas layers exihibit a dc Josephson-like effect. A simple model of an overdamped voltage biased Josephson junction is in reasonable agreement with the observed tunneling I-V. At small tunneling biases, it exhibits a tunneling "supercurrent". The dissipation is carefully studied in this tunneling "supercurrent" and found to remain small but finite.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:tunneling, Coulomb drag, exciton condensation, bilayer quantum Hall effect
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Eisenstein, James P.
Group:Institute for Quantum Information and Matter
Thesis Committee:
  • Eisenstein, James P. (chair)
  • Schwab, Keith C.
  • Motrunich, Olexei I.
  • Hsieh, David
  • Alicea, Jason F.
Defense Date:18 September 2015
Non-Caltech Author Email:leena.nandi (AT)
Record Number:CaltechTHESIS:09232015-145320310
Persistent URL:
Related URLs:
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Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9172
Deposited By: Debaleena Nandi
Deposited On:07 Oct 2015 16:12
Last Modified:02 Jun 2020 21:48

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