Noise-induced resonance-like phenomena in InP crystals embedded in fluctuating electric fields

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

doi:10.1088/1742-5468/2016/05/054021

Cited by 4 publications

(3 citation statements)

References 57 publications

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“…This peculiar behavior in nonequilibrium relaxation dynamics of the electron spin system, which is essentially due to the nonlinear spin-lattice interaction through the phononic thermal bath [95], is akin to the noise-enhanced stability (NES) phenomenon, theoretically and experimentally well investigated in classical systems [96][97][98] and recently in quantum systems [99,100]. The NES eect is one of the noise-induced phenomena relevant to understanding the eect of temperature on the transient nonequilibrium dynamics of complex systems [101][102][103][104][105][106][107][108][109][110][111].…”

Section: J Stat Mech (2019) 094019mentioning

confidence: 99%

Nonequilibrium electron spin relaxation in n-type doped GaAs sample

et al. 2019

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Non-equilibrium electron spin relaxation in a n-type doped GaAs bulk semiconductor is investigated. We use a semiclassical Monte Carlo approach by considering multivalley spin dynamics of drifting electrons. Spin relaxation is considered through the D'yakonov-Perel mechanism, which is the dominant process in III-V semiconductors. An analytical expression for the inhomogeneous broadening of spin precession vector is derived by taking into account the eect of the electric field and the doping density. The inclusion of electron-electron scattering has the eect of increasing both the spin lifetime and the depolarization length. In particular, we find a non-monotonic trend with the maximum of both the spin lifetime and the depolarization length, as a function of the lattice temperature. This peculiar behavior, which is due to the nonlinear spin-lattice interaction through the phononic thermal bath, is akin to the noise-enhanced stability phenomenon. Moreover, for lattice temperatures up to 77 K the electron spin lifetime slightly increases with the doping density, while the spin depolarization length shows a decreasing behaviour. For electic field amplitudes higher than the threshold field (Gunn field), the spin lifetime increases with the lattice temperature. Our numerical findings are validated by a good agreement with the available experimental results.

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Section: J Stat Mech (2019) 094019mentioning

confidence: 99%

Nonequilibrium electron spin relaxation in n-type doped GaAs sample

et al. 2019

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“…Similarly, investigations on the plasmonic noise in terahertz electronic devices were also discussed [19,20]. In [21] the occurrence of noise reduction eect in semiconductors embedded in sub-THz electric fields is studied. This is an example of the well-known phenomena of stochastic resonance, where the system performance resonates at a particular noise level.…”

Section: J Stat Mech (2016) 054001mentioning

confidence: 99%

Introduction: Unsolved Problems on Noise

Oriols

Ciliberto

2016

J. Stat. Mech.

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This paper is an introduction to the special issue of the 7th Int. Conf. on Unsolved Problems on Noise (UPoN) that took place at Casa Convalescència in Barcelona (Spain) in July 2015. The aim of the UPoN conferences is to provide a forum for researchers working on different fields of noise, fluctuations and variability, where they present their scientific problems which resist solutions. The papers of this Special Issue reflect the interdisciplinary topics (physics, biology, circuits, financial markets, psychology, technology, etc) presented at the UPoN conference. Noise is not only a hindrance to signal detection, but it is indeed a valuable source of information (not present in the signal) that help us to get a deeper understanding on how Nature works.

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“…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

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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Noise-induced resonance-like phenomena in InP crystals embedded in fluctuating electric fields

Cited by 4 publications

References 57 publications

Nonequilibrium electron spin relaxation in n-type doped GaAs sample

Nonequilibrium electron spin relaxation in n-type doped GaAs sample

Introduction: Unsolved Problems on Noise

Nonlinear Relaxation Phenomena in Metastable Condensed Matter Systems

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