External Noise Effects in Doped Semiconductors Operating Under sub-THz Signals

Adorno, Dominique Persano; Pizzolato, Nicola; Valenti, Davide; Spagnolo, Bernardo

doi:10.1016/s0034-4877(12)60037-8

Cited by 22 publications

(18 citation statements)

References 20 publications

(21 reference statements)

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“…Noise enhanced stability [46][47][48] in the electron transport inside GaAs bulks, caused by the addition of external fluctuations to the driving oscillating electric field, has been reported in Refs. [49][50][51]. Recently, in semiconductor quantum wells and quantum wires the possibility of exploiting random Rashba spin−orbit interaction to generate spin currents has been found [52].…”

Section: Spin Polarised Transportmentioning

confidence: 99%

Noise-induced effects in nonlinear relaxation of condensed matter systems

Spagnolo

Valenti²,

Guarcello

et al. 2015

Chaos, Solitons & Fractals

122

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Section: Spin Polarised Transportmentioning

confidence: 99%

Noise-induced effects in nonlinear relaxation of condensed matter systems

Spagnolo

Valenti²,

Guarcello

et al. 2015

Chaos, Solitons & Fractals

122

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“…A similar approach to model the dichotomous noise source was previously implemented and used in other contexts, from generalized Lotka-Volterra systems [124][125][126][127] to electron transport dynamics in GaAs samples [41]. Equation (7) is numerically solved within the Ito scheme by setting ∆t = ∆x = 0.05.…”

Section: Long Jj-the Modelmentioning

confidence: 99%

“…This counterintuitive effect has been found in different physical areas, ranging from the generation of spin currents [29], aggregation kinetics of Brownian particles [30,31], chemical reaction system [32], translocation dynamics of polymers [33][34][35], ultra-fast magnetization dynamics of magnetic spin systems [36,37], dynamic electron response in zinc-blende semiconductor crystals [38][39][40][41][42][43], noise redistribution in quasi 2D Silicon Mos inversion layers [44], to interdisciplinary physical models [45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Relaxation Phenomena in Metastable Condensed Matter Systems

Spagnolo

Guarcello

Magazzù

et al. 2016

Entropy

Self Cite

100

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Nonlinear relaxation phenomena in three different systems of condensed matter are investigated. (i) First, the phase dynamics in Josephson junctions is analyzed. Specifically, a superconductor-graphene-superconductor (SGS) system exhibits quantum metastable states, and the average escape time from these metastable states in the presence of Gaussian and correlated fluctuations is calculated, accounting for variations in the the noise source intensity and the bias frequency. Moreover, the transient dynamics of a long-overlap Josephson junction (JJ) subject to thermal fluctuations and non-Gaussian noise sources is investigated. Noise induced phenomena are observed, such as the noise enhanced stability and the stochastic resonant activation. (ii) Second, the electron spin relaxation process in a n-type GaAs bulk driven by a fluctuating electric field is investigated. In particular, by using a Monte Carlo approach, we study the influence of a random telegraph noise on the spin polarized transport. Our findings show the possibility to raise the spin relaxation length by increasing the amplitude of the external fluctuations. Moreover, we find that, crucially, depending on the value of the external field strength, the electron spin depolarization length versus the noise correlation time increases up to a plateau. (iii) Finally, the stabilization of quantum metastable states by dissipation is presented. Normally, quantum fluctuations enhance the escape from metastable states in the presence of dissipation. We show that dissipation can enhance the stability of a quantum metastable system, consisting of a particle moving in a strongly asymmetric double well potential, interacting with a thermal bath. We find that the escape time from the metastable region has a nonmonotonic behavior versus the system-bath coupling and the temperature, producing a stabilizing effect.Keywords: metastability; nonequilibrium statistical mechanics and nonlinear relaxation time; noise enhanced stability; Josephson junction; spin polarized transport in semiconductors; open quantum systems; quantum noise enhanced stability

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“…For a delay time greater than T DN , where T DN = 2π/ω DN , we observe a synchronization between the jumps and the periodicity of the rate γ DN (t). A similar approach to model the dichotomous noise source was previously implemented and used in other contexts, from a Lotka-Volterra system of two [51,52] or more [53,54] competing species to electron transport dynamics in Gallium arsenide (GaAs) samples [55]. Equation (1) is numerically solved within the Ito scheme.…”

Section: The Modelmentioning

confidence: 99%

Stabilization Effects of Dichotomous Noise on the Lifetime of the Superconducting State in a Long Josephson Junction

Guarcello

Valenti

Carollo

et al. 2015

Entropy

Self Cite

102

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We investigate the superconducting lifetime of a long overdamped current-biased Josephson junction, in the presence of telegraph noise sources. The analysis is performed by randomly choosing the initial condition for the noise source. However, in order to investigate how the initial value of the dichotomous noise affects the phase dynamics, we extend our analysis using two different fixed initial values for the source of random fluctuations. In our study, the phase dynamics of the Josephson junction is analyzed as a function of the noise signal intensity, for different values of the parameters of the system and external driving currents. We find that the mean lifetime of the superconductive metastable state as a function of the noise intensity is characterized by nonmonotonic behavior, strongly related to the soliton dynamics during the switching towards the resistive state. The role of the correlation time of the noise source is also taken into account. Noise-enhanced stability is observed in the investigated system.

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External Noise Effects in Doped Semiconductors Operating Under sub-THz Signals

Cited by 22 publications

References 20 publications

Noise-induced effects in nonlinear relaxation of condensed matter systems

Noise-induced effects in nonlinear relaxation of condensed matter systems

Nonlinear Relaxation Phenomena in Metastable Condensed Matter Systems

Stabilization Effects of Dichotomous Noise on the Lifetime of the Superconducting State in a Long Josephson Junction

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