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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

Journal Article · · Physical Review B
 [1];  [2];  [2]; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Princeton Univ., Princeton, NJ (United States)
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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.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1462330
Alternate ID(s):
OSTI ID: 1457578
Report Number(s):
NREL/JA-5K00-71747; PRBMDO; TRN: US1902140
Journal Information:
Physical Review B, Vol. 97, Issue 23; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (14)

Light Scattering by Photoexcited Two-Dimensional Electron Plasma in GaAs-(AlGa) As Heterostructures journal May 1981
Large exchange interactions in the electron gas of GaAs quantum wells journal October 1989
Intersubband spectroscopy of two dimensional electron gases: Coulomb interactions journal October 1980
Plasmonic all-optical tunable wavelength shifter journal November 2007
Collective modes of spatially separated, two-component, two-dimensional plasma in solids journal January 1981
Angle-resolved Raman spectroscopy of the collective modes in an electron bilayer journal January 1999
Eigenstate localization in an asymmetric coupled quantum well pair journal June 2012
Acoustic plasmons in a conducting double layer journal January 1988
Indirect barrier electron-hole gas transitions in mixed type-I–type-II GaAs/AlAs multiple quantum wells journal June 2001
Determination of single-particle relaxation time from light scattering spectra in modulation-doped quantum wells journal July 1987
Quasi-two-dimensional photoexcited carriers in GaAs doping superlattices journal August 1982
Recombination dynamics of spatially separated electron-hole plasmas in GaAs/AlAs mixed type-I/type-II quantum well structures journal September 2003
Low‐power, all‐optical nonlinear absorption in asymmetric double quantum wells journal June 1991
Exchange instability of the two-dimensional electron gas in semiconductor quantum wells journal March 2002

Figures / Tables (3)

FIG. 1.(p. 2)figure FIG. 1.
FIG. 2.(p. 2)figure FIG. 2.
FIG. 3.(p. 3)figure FIG. 3.

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Related Subjects

36 MATERIALS SCIENCE
plasmons
inelastic light scattering
quantum wells
two-dimensional electron gas