Full momentum- and energy-resolved spectral function of a 2D electronic system
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1701.01684.pdf
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1.49 MB
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Author(s)
Pfeiffer, L. N.
West, K. W.
Baldwin, K. W.
Jang, Joonho
Yoo, Heun Mo
Ashoori, Raymond
Date Issued
November 2017
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Jang, Joonho, Heun Mo Yoo, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and Raymond C. Ashoori. “Full Momentum- and Energy-Resolved Spectral Function of a 2D Electronic System.” Science 358, no. 6365 (November 16, 2017):
Version
Original manuscript
Abstract
The single-particle spectral function measures the density of electronic states in a material as a function of both momentum and energy, providing central insights into strongly correlated electron phenomena. Here we demonstrate a high-resolution method for measuring the full momentum- and energy-resolved electronic spectral function of a two-dimensional (2D) electronic system embedded in a semiconductor. The technique remains operational in the presence of large externally applied magnetic fields and functions even for electronic systems with zero electrical conductivity or with zero electron density. Using the technique on a prototypical 2D system, a GaAs quantum well, we uncover signatures of many-body effects involving electron-phonon interactions, plasmons, polarons, and a phonon analog of the vacuum Rabi splitting in atomic systems.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1126/SCIENCE.AAM7073
