Quasi-two-dimensional carriers in dilute-magnetic-semiconductor quantum wells under in-plane magnetic field

✍ Scribed by Constantinos Simserides; Iosif Galanakis

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 161 KB
• Volume: 40
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2007.08.061

✦ Synopsis

Due to the competition between spatial and magnetic confinement, the density of states (DOS) of a quasi-two-dimensional system deviates from the ideal step-like form both quantitatively and qualitatively. We study how this affects the spin-subband populations and the spin polarization as functions of the temperature, T, and the in-plane magnetic field, B, for narrow to wide dilute-magneticsemiconductor quantum wells (QWs). We focus on the QW width, the magnitude of the spin-spin exchange interaction, and the sheet carrier concentration dependence. We look for ranges where the system is completely spin polarized. Increasing T, the carrier spin splitting, U 0s , decreases, while on increasing B, U 0s increases. Moreover, due to the DOS modification, all energetically higher subbands become gradually depopulated.