Inelastic light scattering from plasmons tunneling between Wannier-Stark states
Abstract
Using inelastic light scattering, we measure the zone-center electronic excitation modes in a set of multiple quantum wells. The width of the wavefunction barriers was chosen such that it prevents significant coupling of the electron ground states between wells yet is transparent to electron tunneling under an electric field. Under these conditions, we find charge-density-like and spin-density-like plasmons whose energies do not correspond to the excitations calculated for either a single well or a set of Coulomb-coupled wells. The observed energies are proportional to the electric field strength and the lower energy modes agree with predictions for plasmons tunneling between the Wannier-Stark ladder states.
- Authors:
-
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Princeton Univ., Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1457124
- Alternate Identifier(s):
- OSTI ID: 1440798
- Report Number(s):
- NREL/JA-5K00-71495
Journal ID: ISSN 0021-8979; TRN: US1901296
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 21; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; single particle tunneling; light scattering; lasers; phonons; semiconductors; quantum wells; electron gas; chemical kinetics
Citation Formats
Fluegel, B., Pfeiffer, L. N., West, K., and Mascarenhas, A. Inelastic light scattering from plasmons tunneling between Wannier-Stark states. United States: N. p., 2018.
Web. doi:10.1063/1.5025851.
Fluegel, B., Pfeiffer, L. N., West, K., & Mascarenhas, A. Inelastic light scattering from plasmons tunneling between Wannier-Stark states. United States. https://doi.org/10.1063/1.5025851
Fluegel, B., Pfeiffer, L. N., West, K., and Mascarenhas, A. Wed .
"Inelastic light scattering from plasmons tunneling between Wannier-Stark states". United States. https://doi.org/10.1063/1.5025851. https://www.osti.gov/servlets/purl/1457124.
@article{osti_1457124,
title = {Inelastic light scattering from plasmons tunneling between Wannier-Stark states},
author = {Fluegel, B. and Pfeiffer, L. N. and West, K. and Mascarenhas, A.},
abstractNote = {Using inelastic light scattering, we measure the zone-center electronic excitation modes in a set of multiple quantum wells. The width of the wavefunction barriers was chosen such that it prevents significant coupling of the electron ground states between wells yet is transparent to electron tunneling under an electric field. Under these conditions, we find charge-density-like and spin-density-like plasmons whose energies do not correspond to the excitations calculated for either a single well or a set of Coulomb-coupled wells. The observed energies are proportional to the electric field strength and the lower energy modes agree with predictions for plasmons tunneling between the Wannier-Stark ladder states.},
doi = {10.1063/1.5025851},
journal = {Journal of Applied Physics},
number = 21,
volume = 123,
place = {United States},
year = {Wed Jun 06 00:00:00 EDT 2018},
month = {Wed Jun 06 00:00:00 EDT 2018}
}
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FIG. 1: Representative inelastic light scattering spectra at 4 K using a laser energy of 1.913 eV and an electric field of 2.06 104 V/cm. The two curves show scattered light that is linearly polarized parallel to (larger signal) and orthogonal to (smaller signal) the laser. Peaks marked with verticalmore »
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Figures / Tables found in this record:
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