Simultaneous effects of hydrostatic pressure and temperature on the binding energy of hydrogenic impurity in cylindrical quantum well wires

Ghosh

2021

Current study inquires the time‐dependent quantum adiabatic switching (TDQAS) among the quantum dot (QD) eigenstates under the aegis of Gaussian white noise (GWN) with special emphasis on anharmonicity that may be present in the QD potential. The initial and the final eigenstates are distinguished by different values of magnetic field strength, confinement potential, anisotropy, and anharmonicity. The QAS has been conducted using four different switching functions (SFs), e.g., square, exponential, sinusoidal, and logarithmic. The time development of switching has been monitored with the help of overlap function and quantum information entropy (QIE). The SFs appear to recover the eigenstates of QD corresponding to the final Hamiltonian. The switching paths comprise features such as enhancement, depletion, maximization, minimization, and crossover of the overlap function and entropy. These characteristics of switching paths depend on presence/absence of noise, its pathway of application (additive/multiplicative), and symmetry (odd/even) of the anharmonic potential. The dependence on the type of SF used, however, has been found to be not much significant unless the exclusive role of noise strength on switching path is observed. The study merits importance in view of immense technological applications of QD‐based systems where the noise‐anharmonicity interplay may be exploited to a great extent.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adiabatic Switching Among Quantum Dot Eigenstates: Role of Anharmonicity and Gaussian White Noise

Roy¹,

Ghosh

2021

“…These two pathways differ from one another in view of the size of system-noise interaction, and thus we can expect different outcomes for applied additive noise and multiplicative noise in comparison with the noise-free ambience. The study explores the SQP profiles against the variation of a few relevant physical quantities such as electric field (F), magnetic field (B), confinement potential (ω 0 ), dopant location (r 0 ), dopant potential (V 0 ), BE, aluminium concentration (y) (considering doped Al y Ga 1Ày As QDs), [9] noise strength (ζ), position-dependent effective mass (PDEM), [52][53][54][55][56][57][58][59][60] position-dependent dielectric screening function (PDDSF), [52,54,61,62] geometrical anisotropy, [63][64][65][66] hydrostatic pressure (HP), [13,16,17,31,32,35,37,67,68] and temperature (T). [17,31,67,68] The findings of the study highlight the role of noise in designing the SQP profiles of doped QDs when different physical quantities undergo gradual change.…”

Section: Introductionmentioning

confidence: 99%

“…The study explores the SQP profiles against the variation of a few relevant physical quantities such as electric field (F), magnetic field (B), confinement potential (ω 0 ), dopant location (r 0 ), dopant potential (V 0 ), BE, aluminium concentration (y) (considering doped Al y Ga 1Ày As QDs), [9] noise strength (ζ), position-dependent effective mass (PDEM), [52][53][54][55][56][57][58][59][60] position-dependent dielectric screening function (PDDSF), [52,54,61,62] geometrical anisotropy, [63][64][65][66] hydrostatic pressure (HP), [13,16,17,31,32,35,37,67,68] and temperature (T). [17,31,67,68] The findings of the study highlight the role of noise in designing the SQP profiles of doped QDs when different physical quantities undergo gradual change.…”

Section: Introductionmentioning

confidence: 99%

Profiles of Static Quadrupole Polarizability of Impurity‐Doped Quantum Dots Driven by Gaussian White Noise

Ghosh

Bera

et al. 2020

Herein, the influence of Gaussian white noise on static quadrupole polarizability (SQP) of the impurity‐doped quantum dots (QDs) is studied. The SQP profiles are critically analyzed as several physical quantities are varied over a range in the absence and presence of noise. The introduction of noise to the system is accomplished via two different routes viz. “additive” and “multiplicative.” SQP profiles consist of noticeable features like maximization, minimization, and saturation in the absence of noise and presence of additive noise. However, on most occasions, the SQP profile becomes devoid of any noticeable characteristics in the presence of multiplicative noise. The multiplicative noise plays some noticeable role only during the direct variation in confinement energy. Herein, the exclusive role of additive noise having strength around a typical value for the generation of large SQP is highlighted. The findings bear mentionable importance on the nonlinear optical properties of QD‐based devices under the aegis of noise.

Profiles of Optical Gain of Impurity‐Doped Quantum Dots under the Stewardship of Gaussian White Noise

Roy²,

Bera

et al. 2022

The optical gain (OG) of quantum dots containing impurity is dealt with in the present investigation under the governance of applied Gaussian white noise. In this regard, various pertinent physical parameters are varied over a range and the resulting variations of OG are thoroughly monitored. Along with OG, the profiles of the gain radiative current density and the bandgap are also analyzed. The authors have come across that the presence/absence of noise, the mode of application of noise (additive/multiplicative), the particular physical parameter concerned, and the range of magnitude of the physical parameter, in unison, govern the features of the OG profiles in diverse ways. The study reveals that tuning of various physical parameters under applied noise in some preferred mode can be useful for the attainment of high OG and saturation gain. Tuning of emission wavelength can also be exploited to design tunable light sources.