Anisotropy effect on the linear and nonlinear optical properties of a lased dressed donor impurity in a GaAs/GaAlAs nanowire superlattice

Physica Status Solidi (b)

Roy³

et al. 2022

Quantum dots (QDs) are acclaimed low-dimensional nanosystems, where we find complete spatial arrest of the motion of the carriers (electrons and holes). Their extremely small dimension helps them display quantum manifestations through various size-dependent physical properties. These properties can be tuned externally thereby making QDs immensely valuable components of technologically advanced devices. As a result, we frequently find research works that analyze various aspects of the low-dimensional nanosystems, [1][2][3][4][5][6][7][8] particularly emphasizing their nonlinear optical (NLO) responses. The effective confinement potential (ECP) of QD principally controls its energy spectrum and the eigenstates. Thus, modulation of ECP can be useful to tailor its properties and consequent applications in fabricating advanced quantum devices. Doping of impurity to QD influences its ECP, which, in turn, profoundly modulates its physical properties. Consequently, studies delving into the impurity effects in QD and other low-dimensional nanosystems are found to be quite abundant.

Section: Introductionmentioning

confidence: 99%

Analyzing Time‐Average Excitation Rate Among Quantum Dot Eigenstates Triggered by Time‐Dependent Noise Strength

Datta¹,

Physica Status Solidi (b)

Roy³

et al. 2022

“…The said routes are prominently distinct in view of system‐noise interaction and often lead to different outcomes with respect to the noise‐free environment. The study analyses the OG profiles pursuing the variation of a handful of relevant physical parameters such as electric field ( F ), magnetic field ( B ), confinement potential (

ω_{0}

), dopant location (

r_{0}

), dopant potential (

V_{0}

), binding energy (BE), aluminum concentration ( y ) (considering

{Al}_{y} {Ga}_{1 - y} As

QD), [ 23 ] noise strength ( ζ ), position‐dependent effective mass (PDEM), [ 55–61 ] position‐dependent dielectric screening function (PDDSF), [ 55,62,63 ] geometrical anisotropy, [ 64–67 ] HP, and temperature ( T ). The study divulges the salient features of OG profile of doped QD under the supervision of noise when different physical parameters undergo gradual change.…”

Section: Introductionmentioning

confidence: 99%

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

Physica Status Solidi (b)

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.

“…Any change of physical parameters that affects the ECP will, therefore, modify the system‐PRF interaction and consequently the TAER. In the present enquiry the physical parameters that are chosen to vary over a range are the amplitude of PRF ( F ), phase of PRF ( φ ), magnetic field ( B ), confinement potential ( ω 0 ), dopant location ( r 0 ), dopant potential ( V 0 ), binding energy (BE), aluminium concentration ( y ) (for doped Al y Ga 1‐y As QD, [23] noise strength ( ζ ), position‐dependent effective mass (PDEM), [41–49] position‐dependent dielectric screening function (PDDSF), [41,43,50,51] geometrical anisotropy, [52–55] hydrostatic pressure (HP) [17,18,26,56,57] and temperature ( T ) [17,18,56,57] . It needs to be mentioned that, in one of our earlier works we have explored excitation in QD subject to PRF but without impurity and noise effects [58] .…”

Section: Introductionmentioning

confidence: 99%

Excitation Dynamics Among Impurity Doped Quantum Dot Eigenstates in a Polychromatic Field: Role of Gaussian White Noise

Datta¹,

Roy³

et al. 2022

ChemistrySelect

Current study focuses on realizing the role of Gaussian white noise (GWN) and external sinusoidal polychromatic radiation field (PRF) on the time-average excitation rate (TAER) of impurity doped quantum dot (QD). The PRF induces the transfer of electronic population from the ground state to the excited states in course of time-evolution. The PRF has been envisaged to be composed of four component fields that maintain either a prime or a non-prime frequency ratio. GWN couples with the system additively and multiplicatively. The study highlights the role of various physical parameters, presence of noise, mode of application of noise and the features of PRF (amplitude, phase and type of frequency ratio of the components) in shaping the TAER profiles. The TAER profiles have been found to be enriched with steady growth, steady decline, maximization (useful for obtaining large nonlinear optical response), minimization and saturation (the dynamic freezing). The study reveals promising scope of obtaining desired TAER of doped QD by judicious adjustment/regulation of several control parameters which may bear serious technological implications.