The effective mass of strong-coupling polaron in a triangular quantum well induced by the Rashba effect

• Published in: Physica. B, Condensed matter Condensed matter, 2008-05, Vol.403 (10), p.1933-1936
• Main Authors: Zhang, Hai-Rui, Xiao, Jing-Lin
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Effective mass; Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Physics; Quantum wells; Rashba SO interaction; Spintronics; Triangular quantum well
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2007.10.256

In this paper, on the basis of Huybrechts’ strong-coupling polaron model, the Tokuda modified linear-combination operator method and the unitary transformation method were used to study the properties of the strong-coupling polaron considering the influence of Rashba effect, which is brought by the spin–orbit (SO) interaction, in the semiconductor triangular quantum well (TQW). Numerical calculation on the RbCl TQW, as an example, is performed. The expressions for the effective mass of the polaron as a function of the vibration frequency, the velocity, the coupling constant and the electron areal density were derived. Numerical results show that the total effective mass of the polaron is composed of three parts. The interactions between the orbit and the spin with different directions have different effects on the effective mass of the polaron.