Topological and non inertial effects on the interband light absorption

Rojas, M.; Filgueiras, Cleverson; Brandão, Julio; Moraes, Fernando

doi:10.1016/j.physleta.2017.12.021

Cited by 8 publications

(5 citation statements)

References 34 publications

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“…[80,81]. Last but not least, the topological and noninertial effects analogous to the of this paper were recently applied in nonrelativistic quantum dots [82].…”

Section: Introductionmentioning

confidence: 65%

Topological, noninertial and spin effects on the 2D Dirac oscillator in the presence of the Aharonov–Casher effect

Oliveira

2019

Eur. Phys. J. C

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In the present paper, we investigate the influence of topological, noninertial and spin effects on the 2D Dirac oscillator in the presence of the Aharonov-Casher effect. Next, we determine the two-component Dirac spinor and the relativistic energy spectrum for the bound states. We observe that this spinor is written in terms of the confluent hypergeometric functions and this spectrum explicitly depends on the quantum numbers n and m l , parameters s and η associated to the topological and spin effects, quantum phase Φ AC , and of the angular velocity Ω associated to the noninertial effects of a rotating frame. In the nonrelativistic limit, we obtain the quantum harmonic oscillator with two types of couplings: the spin-orbit coupling and the spin-rotation coupling. We note that the relativistic and nonrelativistic spectra grow in absolute values as functions of η, Ω, and Φ AC and its periodicities are broken due to the rotating frame. Finally, we compared our problem with other works, where we verified that our results generalizes some particular planar cases of the literature.

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“…[80,81]. Last but not least, the topological and noninertial effects analogous to the of this paper were recently applied in nonrelativistic quantum dots [82].…”

Section: Introductionmentioning

confidence: 65%

Topological, noninertial and spin effects on the 2D Dirac oscillator in the presence of the Aharonov–Casher effect

Oliveira

2019

Eur. Phys. J. C

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“…tem to be studied. The angular limitation leading to an excised region complicates the analysis, though a transformation to a new coordinate system can be achieved via the set of transformation equations [46][47][48]…”

Section: Theoretical Model a Energy Spectrum Of The Quantum Systemmentioning

confidence: 99%

“…The aim of this work is to investigate the thermal, magnetic and optical properties of a single-electron system incorporating the Rashba SOI within a 2D-QD that displays a topological defect given by a conical disclination [46][47][48]. Moreover, our model consists of a particle trapped in a potential that interpolates between parabolic and a Gaussian potential, as the whole system is subjected to a uniform external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Impact of a topological defect and Rashba spin-orbit interaction on the thermo-magnetic and optical properties of a 2D semiconductor quantum dot with Gaussian confinement

Castaño-Yepes

Amor-Quiroz

Ramirez-Gutierrez

et al. 2019

Physica E: Low-dimensional Systems and Nanostructures

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In this paper, we examine the effect of introducing a conical disclination on the thermal and optical properties of a two dimensional GaAs quantum dot in the presence of a uniform and constant magnetic field. In particular, our model consists of a single-electron subject to a confining Gaussian potential with a spin-orbit interaction in the Rashba approach. We compute the specific heat and the magnetic susceptibility from the exact solution of the Schrödinger equation via the canonical partition function, and it is shown that the peak structure of the Schottky anomaly is linearly displaced as a function of the topological defect. We found that such defect and the Rashba coupling modify the values of the temperature and magnetic field in which the system behaves as a paramagnetic material. Remarkably, the introduction of a conical disclination in the quantum dot relaxes the selection rules for the electronic transitions when an external electromagnetic field is applied. This creates a new set of allowed transitions causing the emergence of semi-suppressed resonances in the absorption coefficient as well as in the refractive index changes which are blue-shifted with respect to the regular transitions for a quantum dot without the defect.

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“…The results of different topological defects and noninertial effects, as well as screw dislocation defect in materials, were probed. The investigation of noninertial effects and dislocation defects because of rotation for noninteracting electron gas confined in two‐dimensional pseudoharmonic QD, a conical disclination defect on thermal and optical properties of GaAs QD with Gaussian confinement, and thermal features of a particle in two‐dimensional parabolic QW including conical disclination are some significant works on disclination defects in low‐dimensional systems. In these works, different computation methods have been used to perform theoretical investigations due to various defects and external field effects.…”

Section: Introductionmentioning

confidence: 99%

Magneto‐optical specifications of Rosen‐Morse quantum dot with screw dislocation

Bahar

Ungan

2020

Int J of Quantum Chemistry

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This is the first study to consider a quantum dot with screw dislocation that has Rosen-Morse (RM) confinement potential, generated by a GaAs/GaAlAs heterostructure.An external magnetic field and Aharonov-Bohm (AB) flux field were also applied on RM quantum dot (RMQD) in order to stave the effects of a screw dislocation defect. The combined effect of the screw dislocation defect, the external magnetic field, and AB flux field on the total refractive index changes (TRICs) and the total absorption coefficients (TACs) of RMQD are thus investigated. Cylindrical coordinates are used due to the direction of application of the torsion and the external fields, as well as due to the structure's symmetry. The effective mass approximation and tridiagonal matrix methods are used in order to obtain the subband energy spectra and electronic wave functions of RMQD.The nonlinear optical specifications of RMQD are checked using compact-density-matrix formalism within the framework of the iterative method. Reviews without screw dislocation are also carried out in order to be able to clarify the effects of a screw dislocation defect on the optical properties, and then, both cases are deliberated. This study is the first attempt to analyze the AB flux field for RMQD without screw dislocation. In the present study, the influences of a screw dislocation defect on RMQD's TRICs and TACs are probed by considering different values of the external magnetic field and AB flux field, and the ranges of corresponding parameters on the optimum of the structure are specified. Moreover, the study also elucidates how to rule out the effects of screw dislocation on optical specifications by means of the external fields. Despite a certain screw dislocation, the frequency range is determined where the structure behaves as if it is perfect (namely, without screw dislocation) for its optimum, which in turn is crucial for experimental applications. K E Y W O R D SAharonov-Bohm flux field, magnetic field, nonlinear optical properties, quantum dot, screw dislocation, Rosen-Morse (RM) confinement potential

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Topological and non inertial effects on the interband light absorption

Cited by 8 publications

References 34 publications

Topological, noninertial and spin effects on the 2D Dirac oscillator in the presence of the Aharonov–Casher effect

Topological, noninertial and spin effects on the 2D Dirac oscillator in the presence of the Aharonov–Casher effect

Impact of a topological defect and Rashba spin-orbit interaction on the thermo-magnetic and optical properties of a 2D semiconductor quantum dot with Gaussian confinement

Magneto‐optical specifications of Rosen‐Morse quantum dot with screw dislocation

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