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Title: Strong quantum coherence between Fermi liquid Mahan excitons

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.
Authors:
 [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)
Publication Date:
Report Number(s):
SAND-2016-3243J
Journal ID: ISSN 0031-9007; PRLTAO; 644876
Grant/Contract Number:
AC04-94AL85000; FG02-07ER46354
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 15; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1263649
Alternate Identifier(s):
OSTI ID: 1247446

Paul, J., Stevens, C. E., Liu, C., Dey, P., McIntyre, C., Turkowski, V., Reno, J. L., Hilton, D. J., and Karaiskaj, D.. Strong quantum coherence between Fermi liquid Mahan excitons. United States: N. p., Web. doi:10.1103/PhysRevLett.116.157401.
Paul, J., Stevens, C. E., Liu, C., Dey, P., McIntyre, C., Turkowski, V., Reno, J. L., Hilton, D. J., & Karaiskaj, D.. Strong quantum coherence between Fermi liquid Mahan excitons. United States. doi:10.1103/PhysRevLett.116.157401.
Paul, J., Stevens, C. E., Liu, C., Dey, P., McIntyre, C., Turkowski, V., Reno, J. L., Hilton, D. J., and Karaiskaj, D.. 2016. "Strong quantum coherence between Fermi liquid Mahan excitons". United States. doi:10.1103/PhysRevLett.116.157401. https://www.osti.gov/servlets/purl/1263649.
@article{osti_1263649,
title = {Strong quantum coherence between Fermi liquid Mahan excitons},
author = {Paul, J. and Stevens, C. E. and Liu, C. and Dey, P. and McIntyre, C. and Turkowski, V. and Reno, J. L. and Hilton, D. J. and Karaiskaj, D.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.116.157401},
journal = {Physical Review Letters},
number = 15,
volume = 116,
place = {United States},
year = {2016},
month = {4}
}