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Title: Splitting of charge-density and spin-density excitations of a bipolar plasma in a frequency shifter of mixed type-I and type-II quantum wells

Here, the Raman frequency of the intersubband charge-density excitation plasmon in type-I and type-II quantum wells is known to be very sensitively controlled via a low-power optical pump signal. We find that, above a threshold electron density of approximately 4 ± 2 × 10 10cm –2, the charge density plasmon mode splits first into two, and then with increasing density into three closely spaced frequencies. A similar splitting occurs in the spin-density wave plasmon associated with the same intersubband transition. We analyze the results including the coupling to the longitudinal optical phonon and hypothesize that the splittings arise from the special situation of a structure of spatially separated bipolar plasmons.
Authors:
 [1] ;  [2] ;  [2] ; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Princeton Univ., Princeton, NJ (United States)
Publication Date:
Report Number(s):
NREL/JA-5K00-71747
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 23; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; plasmons; inelastic light scattering; quantum wells; two-dimensional electron gas
OSTI Identifier:
1462330
Alternate Identifier(s):
OSTI ID: 1457578

Fluegel, Brian D., Pfeiffer, Loren N., West, Ken, and Mascarenhas, Angelo J.. Splitting of charge-density and spin-density excitations of a bipolar plasma in a frequency shifter of mixed type-I and type-II quantum wells. United States: N. p., Web. doi:10.1103/PhysRevB.97.235313.
Fluegel, Brian D., Pfeiffer, Loren N., West, Ken, & Mascarenhas, Angelo J.. Splitting of charge-density and spin-density excitations of a bipolar plasma in a frequency shifter of mixed type-I and type-II quantum wells. United States. doi:10.1103/PhysRevB.97.235313.
Fluegel, Brian D., Pfeiffer, Loren N., West, Ken, and Mascarenhas, Angelo J.. 2018. "Splitting of charge-density and spin-density excitations of a bipolar plasma in a frequency shifter of mixed type-I and type-II quantum wells". United States. doi:10.1103/PhysRevB.97.235313.
@article{osti_1462330,
title = {Splitting of charge-density and spin-density excitations of a bipolar plasma in a frequency shifter of mixed type-I and type-II quantum wells},
author = {Fluegel, Brian D. and Pfeiffer, Loren N. and West, Ken and Mascarenhas, Angelo J.},
abstractNote = {Here, the Raman frequency of the intersubband charge-density excitation plasmon in type-I and type-II quantum wells is known to be very sensitively controlled via a low-power optical pump signal. We find that, above a threshold electron density of approximately 4 ± 2 × 1010cm–2, the charge density plasmon mode splits first into two, and then with increasing density into three closely spaced frequencies. A similar splitting occurs in the spin-density wave plasmon associated with the same intersubband transition. We analyze the results including the coupling to the longitudinal optical phonon and hypothesize that the splittings arise from the special situation of a structure of spatially separated bipolar plasmons.},
doi = {10.1103/PhysRevB.97.235313},
journal = {Physical Review B},
number = 23,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}