Dynamical properties of spin and subbands populations in 1D quantum wire

Abstract

In this paper we study the spin and subbands populations, as functions of time, for electrons in a quasi-1D quantum wire, with spin -orbit coupling (SOC), to which a perpendicular magnetic field is applied. The system is governed by the Hamiltonian which, in the strong magnetic field limit, resembles the JaynesCummings model (JCM) in quantum optics (QO). Using a procedure similar to that in QO, we explicitly present the time-evolution operator, thereby calculating the spin states and subbands populations as functions of time. We show that the populations exhibit oscillations, depending on the interaction parameters, scale lengths and, particularly, the initial states of the system. Specifically, if the electrons are initially prepared in a maximal coherent superposition of spin states, the expectation values periodically collapse and revive. The collapse-revivals are most profound for the spin along the magnetic field and subbands populations.

Intersubband optical absorption coefficients and refractive index changes in a V‐groove quantum wire

“…During the last decade, the electronic and optical properties of quantum wires have been received a great attention by researchers 1–8. Using the semiconductor growth techniques like chemical lithography, molecular‐beam epitaxy, etc., it has been made possible to obtain a certain type of heterostructures known as V‐groove or ridge quantum wire.…”

Spin Precession in a Quasi-1D Rashba Quantum Loop

“…Although the latter, with slight differences, is common to the same situation in a quantum wire, the spin precession here is circular or elliptical, depending on the electronic location, whereas in the wire it is just elliptical. 19 The wobbulations of the spin about the magnetic field, arising from the interaction with subbands, through the Rashba effect, also appear in quantum wires 19 and quantum dots. 20 This article is organized in the following manner.…”

Linear and nonlinear susceptibilities in GaN/Al x Ga1−x N quantum wire

“…Over the last two decades, physical properties of quantum wells, quantum wires and quantum dots have attracted the interest of theoretical and experimental investigations [1][2][3][4][5][6][7][8]. These nanostructures exhibit new electronic and optical properties offering a wide range of potential applications in optoelectronic devices, photodetectors [9,10], far-infrared laser amplifiers [11,12], light emitting diodes [13,14] and solar cells [15].…”