TY - JOUR

T1 - Noise influence on electron dynamics in semiconductors driven by a periodic electric field

AU - Pizzolato, Nicola

AU - Persano Adorno, Dominique

AU - Spagnolo, Bernardo

AU - Pizzolato, null

AU - Persano Adorno, null

AU - Spagnolo, null

PY - 2009

Y1 - 2009

N2 - Studies concerning the constructive aspects of noise and fluctuations in different non-linear systems have shown that the addition of external noise to systems with an intrinsic noise may result in a less noisy response. Recently, the possibility of reducing the diffusion noise in semiconductor bulk materials by adding a random fluctuating contribution to the driving static electric field has been tested. The present work extends the previous theories by considering the noise-induced effects on the electron transport dynamics in low-doped n-type GaAs samples driven by a high-frequency periodic electric field (cyclostationary conditions). By means of Monte Carlo simulations, we calculate the changes in the spectral density of the electron velocity fluctuations caused by the addition of an external correlated noise source. The results reported in this paper confirm that, under specific conditions, the presence of a fluctuating component added to an oscillating electric field can reduce the total noise power. Furthermore, we find a non-linear behaviour of the spectral density with the noise intensity. Our study reveals that, critically depending on the external noise correlation time, the dynamical response of electrons driven by a periodic electric field benefits from the constructive interplay between the fluctuating field and the intrinsic noise of the system.

AB - Studies concerning the constructive aspects of noise and fluctuations in different non-linear systems have shown that the addition of external noise to systems with an intrinsic noise may result in a less noisy response. Recently, the possibility of reducing the diffusion noise in semiconductor bulk materials by adding a random fluctuating contribution to the driving static electric field has been tested. The present work extends the previous theories by considering the noise-induced effects on the electron transport dynamics in low-doped n-type GaAs samples driven by a high-frequency periodic electric field (cyclostationary conditions). By means of Monte Carlo simulations, we calculate the changes in the spectral density of the electron velocity fluctuations caused by the addition of an external correlated noise source. The results reported in this paper confirm that, under specific conditions, the presence of a fluctuating component added to an oscillating electric field can reduce the total noise power. Furthermore, we find a non-linear behaviour of the spectral density with the noise intensity. Our study reveals that, critically depending on the external noise correlation time, the dynamical response of electrons driven by a periodic electric field benefits from the constructive interplay between the fluctuating field and the intrinsic noise of the system.

KW - Classical Monte Carlo simulations

KW - transport
properties (theory)

KW - ﬂuctuations (theory)

KW - Classical Monte Carlo simulations

KW - transport
properties (theory)

KW - ﬂuctuations (theory)

UR - http://hdl.handle.net/10447/34097

M3 - Article

SN - 1742-5468

VL - 2009

JO - Journal of Statistical Mechanics: Theory and Experiment

JF - Journal of Statistical Mechanics: Theory and Experiment

ER -