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Updated: Feb 18, 2026

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
Full momentum- and energy-resolved spectral function of a 2D electronic system
Joonho Jang1, Heun Mo Yoo2, L N Pfeiffer3
1Department of Physics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA. jjang7@mit.edu ashoori@mit.edu.
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.
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