Tunable potentials and decoherence effect on polaron in nanostructures

Fotué, A. J.; Fobasso, M. F. C.; Kenfack, S. C.; Tiotsop, M.; Djomou, J.-R. D.; Ekosso, C. M.; Nguimeya, G. P.; Danga, J. E.; Tsiaze, R.M. Keumo; Fai, Lukong Cornelius

doi:10.1140/epjp/i2016-16205-5

Cited by 26 publications

(3 citation statements)

References 30 publications

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“…Obviously, the PD has a minimum value at t = 0.5T 0 . These results show the law similar to that obtained by Liu et al, [47] Chen et al [57] and Fotue et al [64] From Fig. 1, one can also obtain that the temperature does not lead to the periodicity of the PD with time and space to change, but the distributions of the PD at different temperatures are different.…”

Section: Resultssupporting

confidence: 89%

Probability density and oscillating period of magnetopolaron in parabolic quantum dot in the presence of Rashba effect and temperature*

Chen¹,

Shao²

2021

Chinese Phys. B

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We study the property of magnetopolaron in a parabolic quantum dot under the Rashba spin–orbit interaction (RSOI) by adopting an unitary transformation of Lee–Low–Pines type and the variational method of Pekar type with and without considering the temperature. The temporal spatial distribution of the probability density and the relationships of the oscillating period with the RSOI constant, confinement constant, electron–phonon coupling strength, phonon wave vector and temperature are discussed. The results show that the probability density of the magnetopolaron in the superposition of the ground and first excited state takes periodic oscillation (T 0/period) in the presence or absence of temperature. Because of the RSOI, the oscillating period is divided into different branches. Also, the results indicate that the oscillating period increases (decreases) when the RSOI constant, electron-phonon coupling strength and phonon wave vector (the confinement constant) increase in a proper temperature, and the temperature plays a significant role in determining the properties of the polaron.

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Section: Resultssupporting

confidence: 89%

Probability density and oscillating period of magnetopolaron in parabolic quantum dot in the presence of Rashba effect and temperature*

Chen¹,

Shao²

2021

Chinese Phys. B

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“…The electronic current 𝐽 flowing into a semiconductor quantum dot is related to the polaron capacitance P C (Eq.22) as suggested by authors of Ref. [36]. In Eq.22, S corresponds to a constant speed when the current is monitored as the potential U and it is given by Eq.23.…”

Section:  mentioning

confidence: 99%

Influence of strong electric field on the properties in semiconductor quantum dot

NOUPEYI,

Nguepnang,

Ekengoue

et al. 2023

Preprint

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Polarons are quasiparticles that result from a strong coupling regime between electron or a hole and ions in nanomaterials. Polarons manifest themselves in many different ways under the influence of external electric and (or) magnetic fields. This paper investigates the influence of strong electric field on polaron properties in semiconductor quantum dot (SCQD). We used the modified Lee Low Pines Huybrecht method to derive fundamental and first state energy of polaron. The superposition of these two states energies which form a quantum bit considered as a two level system (TLS) allowed us to evaluate the probability density, capacitance and conductance of the polaron under the Drude model. Our results indicate that the electric field possesses pronounced effects on the properties of polaron in SCQD. Some of these effects include but are not limited to: (i) the variation of the probability density according to the x and y planar coordinates; (2i) the periodical modification of the probability density with electric field frequency and its dependence on longitudinal optical (LO) phonon-coupling strength constant; (3i) the observation of both positive and negative values of the energy of the system, indicating the formation of free and couple polaronic entities in the system. In particular, we found that the ground state energy of the polaron is predominant in Galium Arsenide (GaAs) SCQD. It comes that, the investigation of strong polaron-electric field (laser radiation) is quite indicated in the case of Galium Arsenide (GaAs).

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“…This agrees with the result of ref. [41], which says that the joint entropy for a Gaussian-type wave packet is not affected by a non-random driving force. However, Equation (69) depends on the damping factor .…”

Section: Joint Entropymentioning

confidence: 99%

Dynamical Properties of Nanostructured Josephson‐Junction Based on the Schwinger Quantum Action Analysis

Choi

2019

Advcd Theory and Sims

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Using the Schwinger action principle, Josephson-junction dynamics for nanodevices have been investigated with emphasis on characterizing their quantum features. Starting from the time-ordered Hamiltonian for the phase of the current which flows across the junction, the propagator, the wave functions, and the joint entropy, which are crucial for quantum analyses of the nano systems, are derived. It is shown that while the propagator and the wave functions vary depending on external driving forces, the joint entropy is not affected from such forces. Interestingly, the probability densities oscillate over time on account of the influence of the time-varying supercurrent in the junction. It is confirmed that if external perturbations on the junction-current are more complicated, the time behaviors of the probability densities become conspicuously irregular. The properties of the joint entropy are also analyzed in detail. Due to damping of the system, the phase( ) component of the joint entropy decreases linearly over time, whereas the conjugate momentum(q) component exhibits linear increase; however, the corresponding joint entropy consequently does not vary. It is demonstrated that the joint entropy obeys the quantum minimum principle, and that there is a close relationship between the joint entropy and the uncertainty relation.

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Tunable potentials and decoherence effect on polaron in nanostructures

Cited by 26 publications

References 30 publications

Probability density and oscillating period of magnetopolaron in parabolic quantum dot in the presence of Rashba effect and temperature*

Probability density and oscillating period of magnetopolaron in parabolic quantum dot in the presence of Rashba effect and temperature*

Influence of strong electric field on the properties in semiconductor quantum dot

Dynamical Properties of Nanostructured Josephson‐Junction Based on the Schwinger Quantum Action Analysis

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