Dietl, Sebastian and Wang, Sheng and Schuh, Dieter and Wegscheider, Werner and Kotthaus, Jorg P. and Pinczuk, Aron and Holleitner, Alexander W. and Wurstbauer, Ursula (2017) Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering. PHYSICAL REVIEW B, 95 (8): 085312. ISSN 2469-9950, 2469-9969
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Photogenerated excitonic ensembles confined in coupled GaAs quantum wells were probed by a complementary approach of emission spectroscopy and resonant inelastic light scattering. Lateral electrostatic trap geometries were used to create dense systems of spatially indirect excitons and excess holes with similar densities in the order of 10(11) cm(-2.) Inelastic light scattering spectra reveal a very sharp low-lying collective mode that is identified at an energy of 0.44 meV and a full width at half maximum of only similar to 50 mu eV. This mode is interpreted as a plasmon excitation of the excess hole system coupled to the photogenerated indirect excitons. The emission energy of the indirect excitons shifts under the application of a perpendicular applied electric field, with the quantum-confined Stark effect unperturbed from the presence of free charge carriers. Our results illustrate the potential of studying low-lying collective excitations in photogenerated exciton systems to explore the many-body phase diagrams, related phase transitions, and interaction physics.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BOSE-EINSTEIN CONDENSATION; MULTIPLE-QUANTUM-WELLS; PHOTOCURRENT SPECTROSCOPY; COULOMB DRAG; GAS; GAAS; HETEROSTRUCTURES; SYSTEMS; LIQUID; SUPERFLUIDITY; |
| 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: | 14 Dec 2018 13:01 |
| Last Modified: | 26 Feb 2019 12:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/374 |
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