Enhancement of Rashba coupling in vertical In0.05Ga0.95As/GaAs quantum dots

S. M. Huang, A. O. Badrutdinov, L. Serra, T. Kodera, T. Nakaoka, N. Kumagai, Y. Arakawa, D. A. Tayurskii, K. Kono, and K. Ono
Phys. Rev. B 84, 085325 – Published 29 August 2011

Abstract

We study the spin-splitting energies in low-potential-barrier quantum dots, finding splitting energies that are orbital state dependent. The theoretical analysis is done with a generalization of the Fock-Darwin states in the presence of spin-orbit interactions. We discuss experimental evidence indicating that the Rashba interaction strength in vertical InxGa1xAs/GaAs quantum dots is in the range 80 meV Å λR 120 meV Å. This enhanced spin-orbit interaction can be understood from the high penetration of the electron wave function into the quantum well with low-potential barrier.

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  • Received 1 March 2011

DOI:https://doi.org/10.1103/PhysRevB.84.085325

©2011 American Physical Society

Authors & Affiliations

S. M. Huang1,2,*, A. O. Badrutdinov1,3, L. Serra4,5, T. Kodera6,7, T. Nakaoka6,7,8, N. Kumagai6,7, Y. Arakawa6,7, D. A. Tayurskii3, K. Kono1, and K. Ono1,9

  • 1Low Temperature Physics Laboratory, RIKEN, Wako-shi, Saitama 351-0198, Japan
  • 2Department of Physics, National Sun Yat-sen University, Kaohsiung, Taiwan 80424, Republic of China
  • 3Physics Department, Kazan Federal University, 420008, Kazan, Russia
  • 4Institut de Física Interdisciplinar i de Sistemes Complexos IFISC (CSIC-UIB), E-07122 Palma de Mallorca, Spain
  • 5Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
  • 6Nanoquine, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8904, Japan
  • 7Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
  • 8Department of Engineering and Applied Sciences, Sophia University, Chiyoda ku, Tokyo 102-8554, Japan
  • 9Quantum Spin Information Project, ICORP-JST, Atsugi-shi, Kanagawa 243-0198, Japan

  • *smhaung.py90g@nctu.edu.tw

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Issue

Vol. 84, Iss. 8 — 15 August 2011

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