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Title: Use of micro-photoluminescence as a contactless measure of the 2D electron density in a GaAs quantum well

We compare micro-photoluminescence (μPL) as a measure of the electron density in a clean, two-dimensional (2D) system confined in a GaAs quantum well (QW) to the standard magneto-transport technique. Our study explores the PL shape evolution across a number of molecular beam epitaxy-grown samples with different QW widths and 2D electron densities and notes its correspondence with the density obtained in magneto-transport measurements on these samples. We also measure the 2D density in a top-gated quantum well sample using both PL and transport and find that the two techniques agree to within a few percent over a wide range of gate voltages. We find that the PL measurements are sensitive to gate-induced 2D density changes on the order of 109 electrons/cm 2. The spatial resolution of the PL density measurement in our experiments is 40 μm, which is already substantially better than the millimeter-scale resolution now possible in spatial density mapping using magneto-transport. Our results establish that μPL can be used as a reliable high spatial resolution technique for future contactless measurements of density variations in a 2D electron system.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2]
  1. Princeton Univ., NJ (United States)
  2. Columbia Univ., New York, NY (United States)
Publication Date:
Grant/Contract Number:
SC0010695; DESC0010695
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 110; Journal Issue: 26; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Univ., NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING
OSTI Identifier:
1473865
Alternate Identifier(s):
OSTI ID: 1366567

Kamburov, D., Baldwin, K. W., West, K. W., Lyon, S., Pfeiffer, L. N., and Pinczuk, A.. Use of micro-photoluminescence as a contactless measure of the 2D electron density in a GaAs quantum well. United States: N. p., Web. doi:10.1063/1.4985439.
Kamburov, D., Baldwin, K. W., West, K. W., Lyon, S., Pfeiffer, L. N., & Pinczuk, A.. Use of micro-photoluminescence as a contactless measure of the 2D electron density in a GaAs quantum well. United States. doi:10.1063/1.4985439.
Kamburov, D., Baldwin, K. W., West, K. W., Lyon, S., Pfeiffer, L. N., and Pinczuk, A.. 2017. "Use of micro-photoluminescence as a contactless measure of the 2D electron density in a GaAs quantum well". United States. doi:10.1063/1.4985439. https://www.osti.gov/servlets/purl/1473865.
@article{osti_1473865,
title = {Use of micro-photoluminescence as a contactless measure of the 2D electron density in a GaAs quantum well},
author = {Kamburov, D. and Baldwin, K. W. and West, K. W. and Lyon, S. and Pfeiffer, L. N. and Pinczuk, A.},
abstractNote = {We compare micro-photoluminescence (μPL) as a measure of the electron density in a clean, two-dimensional (2D) system confined in a GaAs quantum well (QW) to the standard magneto-transport technique. Our study explores the PL shape evolution across a number of molecular beam epitaxy-grown samples with different QW widths and 2D electron densities and notes its correspondence with the density obtained in magneto-transport measurements on these samples. We also measure the 2D density in a top-gated quantum well sample using both PL and transport and find that the two techniques agree to within a few percent over a wide range of gate voltages. We find that the PL measurements are sensitive to gate-induced 2D density changes on the order of 109 electrons/cm2. The spatial resolution of the PL density measurement in our experiments is 40 μm, which is already substantially better than the millimeter-scale resolution now possible in spatial density mapping using magneto-transport. Our results establish that μPL can be used as a reliable high spatial resolution technique for future contactless measurements of density variations in a 2D electron system.},
doi = {10.1063/1.4985439},
journal = {Applied Physics Letters},
number = 26,
volume = 110,
place = {United States},
year = {2017},
month = {6}
}