Electron gfactor in bulk Ga_{1x}In_{x}As_{y}Sb_{1y}/GaSb quaternary alloy and in GaSb/Ga_{1x}In_{x}As_{y}Sb_{1y}/GaSb Spherical quantum dots
Abstract
Secure quantum communications require an entanglementpreserving photodetector in which quantum information is transmitted by photon polarization through an mid infrared optical fiber system and then transferred to electron spin in a optoelectronic semiconductor device. Using interpolation scheme we have investigated the electron gfactor in bulk Ga_{1x}In_{x}As_{y}Sb_{1y} quaternary alloy matched to GaSb as a function of Indium and Arsenic concentration on the complete range 0≤x,y≤1. A specific gfactor as a function of the radius in a spherical GaSb/Ga_{1x}In_{x}As_{y}Sb_{1y}/GaSb quantum dot heterostructure is calculated. Furthermore, we present calculations of the energy states including the Zeeman effect on the electrons confined in quaternary heterostructure quantum dots, with a parabolic confining potential under applied magnetic fields. Our calculations have been worked out by using interpolating methods to find the band gap as a function of the Indium concentration in order to determine the conduction bandoffset at room temperature in GaSb/Ga_{1x}In_{x}As_{y}Sb_{1y}/GaSb heterostructure, within the effectivemass approximation. Experimental or theoretical electron gfactor, spinorbit splitting ∆_{so},_{ and coupling matrix elements Ep = (2/m0})<SpxX>^{2} value between the states of the lowest conduction band Γ6 and the upper valence bands Γ_{8} for Ga_{1x}In_{xAsySb1y}/GaSb quaternary alloy are not readily available. Our predictions show that electron gfactor values are in the range between the electron gfactor measured in bulk GaSb when x→0 (g = 9.25) and that measured in InAs when x→1 (g = 18.08), but there is a remarkable minimum in the gfactor value (g≃23.14) at x≃0.67.
 Publication:

Physics of Semiconductors: 30th International Conference on the Physics of Semiconductors
 Pub Date:
 December 2011
 DOI:
 10.1063/1.3666479
 Bibcode:
 2011AIPC.1399..513S
 Keywords:

 quantum communication;
 photodetectors;
 quantum dots;
 temperature measurement;
 03.67.Hk;
 42.79.Pw;
 73.63.Kv;
 07.20.Dt;
 Quantum communication;
 Imaging detectors and sensors;
 Quantum dots;
 Thermometers