TY - JOUR

T1 - EFFECT OF A FLUCTUATING ELECTRIC FIELD ON ELECTRON SPIN DEPHASING TIME IN III–V SEMICONDUCTORS

AU - Spagnolo, Bernardo

AU - Spezia, Stefano

AU - Persano Adorno, Dominique

AU - Pizzolato, Nicola

PY - 2012

Y1 - 2012

N2 - We investigate the electron spin dephasing in low n-doped GaAs semiconductorbulks driven by a correlated fluctuating electric field. The electrondynamics is simulated by a Monte Carlo procedure which keeps intoaccount all the possible scattering phenomena of the hot electrons in themedium and includes the evolution of spin polarization. Spin relaxationtimes are computed through the D’yakonov–Perel process, which is theonly relevant relaxation mechanism in zinc-blende semiconductors. Thedecay of initial spin polarization of conduction electrons is calculated fordifferent values of field strength, noise intensity and noise correlation time.For values of noise correlation time comparable to the spin lifetime of thesystem, we find that spin relaxation times are significantly affected by theexternal noise. The effect increases with the noise amplitude. Moreover,for each value of the noise amplitude, a nonmonotonic behaviour of spinrelaxation time as a function of the noise correlation time is found.

AB - We investigate the electron spin dephasing in low n-doped GaAs semiconductorbulks driven by a correlated fluctuating electric field. The electrondynamics is simulated by a Monte Carlo procedure which keeps intoaccount all the possible scattering phenomena of the hot electrons in themedium and includes the evolution of spin polarization. Spin relaxationtimes are computed through the D’yakonov–Perel process, which is theonly relevant relaxation mechanism in zinc-blende semiconductors. Thedecay of initial spin polarization of conduction electrons is calculated fordifferent values of field strength, noise intensity and noise correlation time.For values of noise correlation time comparable to the spin lifetime of thesystem, we find that spin relaxation times are significantly affected by theexternal noise. The effect increases with the noise amplitude. Moreover,for each value of the noise amplitude, a nonmonotonic behaviour of spinrelaxation time as a function of the noise correlation time is found.

KW - Distribution theory and Monte Carlo studies

KW - High-field and nonlinear effects

KW - Noise processes and phenomena

KW - Spin relaxation and scattering

KW - Distribution theory and Monte Carlo studies

KW - High-field and nonlinear effects

KW - Noise processes and phenomena

KW - Spin relaxation and scattering

UR - http://hdl.handle.net/10447/63085

UR - http://th-www.if.uj.edu.pl/acta/vol43/pdf/v43p1191.pdf

M3 - Article

VL - 43

SP - 1191

EP - 1201

JO - Acta Physica Polonica B

JF - Acta Physica Polonica B

SN - 0587-4254

ER -