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Light-Driven Electron-Hole Bardeen-Cooper-Schrieffer-Like State in Bulk GaAs

Yuta Murotani, Changsu Kim, Hidefumi Akiyama, Loren N. Pfeiffer, Ken W. West, and Ryo Shimano
Phys. Rev. Lett. 123, 197401 – Published 8 November 2019
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Abstract

We investigate the photon-dressed state of excitons in bulk GaAs by optical pump-probe spectroscopy. We reveal that the high-energy branch of the dressed states continuously evolves into a singular enhancement at the absorption edge in the high-density region where the exciton picture is no longer valid. Comparing the experimental result with a simulation based on semiconductor Bloch equations, we show that the dressed state in such a high-density region is better viewed as a Bardeen-Cooper-Schrieffer-like state, which has been theoretically anticipated to exist over decades. Having seen that the dressed state can be regarded as a macroscopic coherent state driven by an external light field, we also discuss the decoherence from the dressed state to an incoherent state after the photoexcitation in view of the Coulomb enhancement in the transient absorption.

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  • Received 25 December 2018
  • Revised 1 July 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.197401

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yuta Murotani1, Changsu Kim2, Hidefumi Akiyama2, Loren N. Pfeiffer3, Ken W. West3, and Ryo Shimano1,4

  • 1Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
  • 2The Institute for Solid State Physics, The University of Tokyo, and OPERANDO-OIL, Kashiwa 277-8581, Japan
  • 3Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
  • 4Cryogenic Research Center, The University of Tokyo, Tokyo 113-0032, Japan

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Issue

Vol. 123, Iss. 19 — 8 November 2019

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