Undressing a collective intersubband excitation in a quantum well

K. Craig; B. Galdrikian; J. N. Heyman; A. G. Markelz; J. B. Williams; M. S. Sherwin; K. Campman; P. F. Hopkins; A. C. Gossard

doi:10.1103/PhysRevLett.76.2382

Undressing a collective intersubband excitation in a quantum well

K. Craig
, B. Galdrikian
, J. N. Heyman
, A. G. Markelz
, J. B. Williams
, M. S. Sherwin
, K. Campman
, P. F. Hopkins
, A. C. Gossard

Physics

University of California at Santa Barbara
Macalester College

Research output: Contribution to journal › Article › peer-review

92 Scopus citations

Abstract

We have experimentally measured the 1-2 intersubband absorption in a single 40 nm wide modulation-doped Al_0.3Ga_0.7As/GaAs square quantum well as a function of frequency, intensity, and charge density. The low-intensity depolarization-shifted absorption occurs near 80 cm⁻¹ (10 meV or 2.4 THz), nearly 30% higher than the intersubband spacing. At higher intensities, the absorption peak shifts to lower frequencies. Our data are in good agreement with a theory proposed by Załużny, which attributes the redshift to a reduction in the depolarization shift as the excited subband becomes populated.

Original language	English
Pages (from-to)	2382-2385
Number of pages	4
Journal	Physical Review Letters
Volume	76
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.76.2382
State	Published - Mar 25 1996

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10.1103/PhysRevLett.76.2382

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title = "Undressing a collective intersubband excitation in a quantum well",

abstract = "We have experimentally measured the 1-2 intersubband absorption in a single 40 nm wide modulation-doped Al0.3Ga0.7As/GaAs square quantum well as a function of frequency, intensity, and charge density. The low-intensity depolarization-shifted absorption occurs near 80 cm−1 (10 meV or 2.4 THz), nearly 30\% higher than the intersubband spacing. At higher intensities, the absorption peak shifts to lower frequencies. Our data are in good agreement with a theory proposed by Za{\l}u{\.z}ny, which attributes the redshift to a reduction in the depolarization shift as the excited subband becomes populated.",

author = "K. Craig and B. Galdrikian and Heyman, \{J. N.\} and Markelz, \{A. G.\} and Williams, \{J. B.\} and Sherwin, \{M. S.\} and K. Campman and Hopkins, \{P. F.\} and Gossard, \{A. C.\}",

year = "1996",

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doi = "10.1103/PhysRevLett.76.2382",

language = "English",

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T1 - Undressing a collective intersubband excitation in a quantum well

AU - Craig, K.

AU - Galdrikian, B.

AU - Heyman, J. N.

AU - Markelz, A. G.

AU - Williams, J. B.

AU - Sherwin, M. S.

AU - Campman, K.

AU - Hopkins, P. F.

AU - Gossard, A. C.

PY - 1996/3/25

Y1 - 1996/3/25

N2 - We have experimentally measured the 1-2 intersubband absorption in a single 40 nm wide modulation-doped Al0.3Ga0.7As/GaAs square quantum well as a function of frequency, intensity, and charge density. The low-intensity depolarization-shifted absorption occurs near 80 cm−1 (10 meV or 2.4 THz), nearly 30% higher than the intersubband spacing. At higher intensities, the absorption peak shifts to lower frequencies. Our data are in good agreement with a theory proposed by Załużny, which attributes the redshift to a reduction in the depolarization shift as the excited subband becomes populated.

AB - We have experimentally measured the 1-2 intersubband absorption in a single 40 nm wide modulation-doped Al0.3Ga0.7As/GaAs square quantum well as a function of frequency, intensity, and charge density. The low-intensity depolarization-shifted absorption occurs near 80 cm−1 (10 meV or 2.4 THz), nearly 30% higher than the intersubband spacing. At higher intensities, the absorption peak shifts to lower frequencies. Our data are in good agreement with a theory proposed by Załużny, which attributes the redshift to a reduction in the depolarization shift as the excited subband becomes populated.

UR - https://www.scopus.com/pages/publications/0001758810

U2 - 10.1103/PhysRevLett.76.2382

DO - 10.1103/PhysRevLett.76.2382

M3 - Article

AN - SCOPUS:0001758810

SN - 0031-9007

VL - 76

SP - 2382

EP - 2385

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

ER -

Undressing a collective intersubband excitation in a quantum well

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