Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering
Abstract
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 1011 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 ~50 μeV. 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.
- Authors:
-
- Technische Univ. Munchen, Garching (Germany); Nanosystems Initiative Munich (NIM), München (Germany)
- Columbia Univ., New York, NY (United States)
- Univ. of Regensburg (Germany)
- Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
- Ludwig Maximilian Univ. of Munich, Munich (Germany)
- Publication Date:
- Research Org.:
- Columbia Univ., New York, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1535864
- Alternate Identifier(s):
- OSTI ID: 1345074
- Grant/Contract Number:
- SC0010695
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 8; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics; Excitons; Photoconductivity; Plasmons; Quantum phase transitions; Quantum wells; Inelastic light scattering; Photoexcitation; Photoluminescence
Citation Formats
Dietl, Sebastian, Wang, Sheng, Schuh, Dieter, Wegscheider, Werner, Kotthaus, Jörg P., Pinczuk, Aron, Holleitner, Alexander W., and Wurstbauer, Ursula. Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering. United States: N. p., 2017.
Web. doi:10.1103/physrevb.95.085312.
Dietl, Sebastian, Wang, Sheng, Schuh, Dieter, Wegscheider, Werner, Kotthaus, Jörg P., Pinczuk, Aron, Holleitner, Alexander W., & Wurstbauer, Ursula. Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering. United States. https://doi.org/10.1103/physrevb.95.085312
Dietl, Sebastian, Wang, Sheng, Schuh, Dieter, Wegscheider, Werner, Kotthaus, Jörg P., Pinczuk, Aron, Holleitner, Alexander W., and Wurstbauer, Ursula. Mon .
"Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering". United States. https://doi.org/10.1103/physrevb.95.085312. https://www.osti.gov/servlets/purl/1535864.
@article{osti_1535864,
title = {Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering},
author = {Dietl, Sebastian and Wang, Sheng and Schuh, Dieter and Wegscheider, Werner and Kotthaus, Jörg P. and Pinczuk, Aron and Holleitner, Alexander W. and Wurstbauer, Ursula},
abstractNote = {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 1011 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 ~50 μeV. 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.},
doi = {10.1103/physrevb.95.085312},
journal = {Physical Review B},
number = 8,
volume = 95,
place = {United States},
year = {Mon Feb 27 00:00:00 EST 2017},
month = {Mon Feb 27 00:00:00 EST 2017}
}
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