TY - JOUR
T1 - New insights into electron spin dynamics in the presence of correlated noise.
AU - Spezia, Stefano
AU - Spagnolo, Bernardo
AU - Pizzolato, Nicola
AU - Persano Adorno, Dominique
PY - 2012
Y1 - 2012
N2 - The changes in the spin depolarization length in zinc-blende semiconductors when an external component of correlated noise is added to a static driving electric field are analyzed for different values of field strength, noise amplitude and correlation time. Electron dynamics is simulated by a Monte Carlo procedure which takes into account all the possible scattering phenomena of the hot electrons in the medium and includes the evolution of spin polarization. Spin depolarization is studied by examining the decay of the initial spin polarization of the conduction electrons through the D'yakonov-Perel process, the only relevant relaxation mechanism in III-V crystals. Our results show that, for electric field amplitudes lower than the Gunn field, the dephasing length shortens with increasing noise intensity. Moreover, a nonmonotonic behavior of spin depolarization length with the noise correlation time is found, characterized by a maximum variation for values of noise correlation time comparable with the dephasing time. Instead, in high field conditions, we find that, critically depending on the noise correlation time, external fluctuations can positively affect the relaxation length. The influence of the inclusion of the electron-electron scattering mechanism is also shown and discussed.
AB - The changes in the spin depolarization length in zinc-blende semiconductors when an external component of correlated noise is added to a static driving electric field are analyzed for different values of field strength, noise amplitude and correlation time. Electron dynamics is simulated by a Monte Carlo procedure which takes into account all the possible scattering phenomena of the hot electrons in the medium and includes the evolution of spin polarization. Spin depolarization is studied by examining the decay of the initial spin polarization of the conduction electrons through the D'yakonov-Perel process, the only relevant relaxation mechanism in III-V crystals. Our results show that, for electric field amplitudes lower than the Gunn field, the dephasing length shortens with increasing noise intensity. Moreover, a nonmonotonic behavior of spin depolarization length with the noise correlation time is found, characterized by a maximum variation for values of noise correlation time comparable with the dephasing time. Instead, in high field conditions, we find that, critically depending on the noise correlation time, external fluctuations can positively affect the relaxation length. The influence of the inclusion of the electron-electron scattering mechanism is also shown and discussed.
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/10447/61197
M3 - Article
VL - 24
SP - 1
EP - 6
JO - JOURNAL OF PHYSICS. CONDENSED MATTER
JF - JOURNAL OF PHYSICS. CONDENSED MATTER
SN - 0953-8984
ER -