Wiersma, R. D. and Lok, J. C. S. and Tiemann, L. and Dietsche, W. and von Klitzing, K. and Wegscbeider, W. and Schuh, D. (2007) Investigations of the nu(T)=1 exciton condensate. INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 21 (8-9). pp. 1256-1265. ISSN 0217-9792,
Full text not available from this repository.Abstract
Recent experiments on quantum Hall bilayers in the vicinity of total filling factor 1 (nu(T)=1) have revealed the possibility of a superfluidic exciton condensate. We report on our experimental work involving the nu(T)=1 exciton condensate in independently contacted bilayer two-dimensional electron systems. We reproduce the previously reported zero bias resonant tunneling peak, a quantized Hall drag resistivity, and in counter-flow configuration, the near vanishing of both rho(xx) and rho(xy) resistivity components. At balanced electron densities in the layers, we find for both drag and counter-flow current configurations, thermally activated transport with a monotonic increase of the activation energy for d/l(B) < 1.65 with activation energies up to 0.4 K. In the imbalanced system the activation energies show a striking asymmetry around the balance point, implying that the gap to charge excitations is considerably different in the separate layers that form the bilayer condensate. This indicates that the measured activation energy is neither the binding energy of the excitons, nor their condensation energy. We establish a phase diagram of the excitonic condensate showing the enhancement of this state at slight imbalances.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DOUBLE-QUANTUM-WELLS; BOSE-EINSTEIN CONDENSATION; ELECTRON-SYSTEMS; HALL SYSTEMS; Bose-Einstein condensate; bilayer; total filling factor one |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Werner Wegscheider |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Dec 2020 15:40 |
| Last Modified: | 15 Dec 2020 15:40 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32893 |
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