Quasi-Two-Dimensional Electron–Hole Liquid in Shallow SiGe/Si Quantum Wells

Quasi-Two-Dimensional Electron–Hole Liquid in Shallow SiGe/Si Quantum Wells DOI 10.1007/s11182-018-1386-6 Russian Physics Journal, Vol. 61, No. 2, June, 2018 (Russian Original No. 2, February, 2018) PHYSICS OF SEMICONDUCTORS AND DIELECTRICS QUASI-TWO-DIMENSIONAL ELECTRON–HOLE LIQUID IN SHALLOW SiGe/Si QUANTUM WELLS 1,2 2 3,4 A. A. Vasilchenko, G. F. Kopytov, and V. S. Krivobok UDC 538.915 An analytical expression is obtained for the energy of a quasi-two-dimensional electron-hole liquid (EHL) in shallow quantum wells. It is shown that in the Si/Si Ge /Si structures with small x, the EHL contains light and 1–x x heavy holes. With increasing x, the transition of EHL to a state with heavy holes occurs, and the equilibrium density of electron-hole pairs strongly decreases. The effect of an external electric field on the EHL properties is studied. Keywords: electron-hole liquid, light and heavy holes, Schrödinger equation. INTRODUCTION Relatively recently, the possibility of the formation of a quasi-two-dimensional EHL in SiGe/Si quantum wells (QWs) has been demonstrated [1–6]. The spectrum of such an EHL is largely formed by the structure of the valence band, the density of states in which is nonmonotonic due to the presence of different hole subbands [6]. At the same time, according to the existing ideas, the appearance of jumps in the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Physics Journal Springer Journals

Quasi-Two-Dimensional Electron–Hole Liquid in Shallow SiGe/Si Quantum Wells

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Physics; Physics, general; Optics, Lasers, Photonics, Optical Devices; Condensed Matter Physics; Nuclear Physics, Heavy Ions, Hadrons; Theoretical, Mathematical and Computational Physics
ISSN
1064-8887
eISSN
1573-9228
D.O.I.
10.1007/s11182-018-1386-6
Publisher site
See Article on Publisher Site

Abstract

DOI 10.1007/s11182-018-1386-6 Russian Physics Journal, Vol. 61, No. 2, June, 2018 (Russian Original No. 2, February, 2018) PHYSICS OF SEMICONDUCTORS AND DIELECTRICS QUASI-TWO-DIMENSIONAL ELECTRON–HOLE LIQUID IN SHALLOW SiGe/Si QUANTUM WELLS 1,2 2 3,4 A. A. Vasilchenko, G. F. Kopytov, and V. S. Krivobok UDC 538.915 An analytical expression is obtained for the energy of a quasi-two-dimensional electron-hole liquid (EHL) in shallow quantum wells. It is shown that in the Si/Si Ge /Si structures with small x, the EHL contains light and 1–x x heavy holes. With increasing x, the transition of EHL to a state with heavy holes occurs, and the equilibrium density of electron-hole pairs strongly decreases. The effect of an external electric field on the EHL properties is studied. Keywords: electron-hole liquid, light and heavy holes, Schrödinger equation. INTRODUCTION Relatively recently, the possibility of the formation of a quasi-two-dimensional EHL in SiGe/Si quantum wells (QWs) has been demonstrated [1–6]. The spectrum of such an EHL is largely formed by the structure of the valence band, the density of states in which is nonmonotonic due to the presence of different hole subbands [6]. At the same time, according to the existing ideas, the appearance of jumps in the

Journal

Russian Physics JournalSpringer Journals

Published: Jun 4, 2018

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