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Strong quantum coherence between Fermi liquid Mahan excitons

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [1]
  1. Univ. of South Florida, Tampa, FL (United States)
  2. Univ. of Central Florida, Orlando, FL (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. Univ. of Alabama, Birmingham, AL (United States)

In modulation doped quantum wells, the excitons are formed as a result of the interactions of the charged holes with the electrons at the Fermi edge in the conduction band, leading to the so-called “Mahan excitons.” The binding energy of Mahan excitons is expected to be greatly reduced and any quantum coherence destroyed as a result of the screening and electron-electron interactions. Surprisingly, we observe strong quantum coherence between the heavy hole and light hole excitons. Such correlations are revealed by the dominating cross-diagonal peaks in both one-quantum and two-quantum two-dimensional Fourier transform spectra. Theoretical simulations based on the optical Bloch equations where many-body effects are included phenomenologically reproduce well the experimental spectra. Furthermore, time-dependent density functional theory calculations provide insight into the underlying physics and attribute the observed strong quantum coherence to a significantly reduced screening length and collective excitations of the many-electron system.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1263649
Alternate ID(s):
OSTI ID: 1247446
Report Number(s):
SAND--2016-3243J; 644876
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 116; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Biexcitons in monolayer transition metal dichalcogenides tuned by magnetic fields journal September 2018
Coherent two-dimensional Fourier transform spectroscopy using a 25 Tesla resistive magnet journal June 2019

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