Electrical Control of Dynamic Spin Splitting Induced by Exchange Interaction as Revealed by Time Resolved Kerr Rotation in a Degenerate Spin-Polarized Electron Gas

Abstract

The manipulation of spin degree of freedom have been demonstrated in spin polarized electron plasma in a heterostructure by using exchange-interaction induced dynamic spin splitting rather than the Rashba and Dresselhaus types, as revealed by time resolved Kerr rotation. The measured spin splitting increases from 0.256meV to 0.559meV as the bias varies from -0.3V to -0.6V. Both the sign switch of Kerr signal and the phase reversal of Larmor precessions have been observed with biases, which all fit into the framework of exchange-interaction-induced spin splitting. The electrical control of it may provide a new effective scheme for manipulating spin-selected transport in spin FET-like devices.

8 pages, 3 figures ; added some discussions

References in corpus (5)

• Gate-Controlled Spin-Orbit Quantum Interference Effects in Lateral Transport
• High temperature spin dephasing in n-typed GaAs quantum wells
• Effect of initial spin polarization on spin dephasing and electron g factor in a high-mobility two-dimensional electron system
• Spin splitting in a polarized quasi-two-dimensional exciton gas
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• Spin relaxation in ultracold spin-orbit coupled ${}^{40}$K gas
• Terahertz radiation-induced conductivity, Kerr and Faraday angles, and spin textures in a two-dimensional electron gas with spin-orbit coupling subjected to a high magnetic field and periodic potential
• Electron spin relaxation in $p$-type GaAs quantum wells
• Anomalous D'yakonov-Perel' spin relaxation in InAs (110) quantum wells under strong magnetic field: role of Hartree-Fock self-energy