The effects of intense laser field and applied electric and magnetic fields on optical properties of an asymmetric quantum well

Restrepo, R.L.; Ungan, F.; Kasapoğlu, E.; Morales, A. L.; Duque, C.A.

doi:10.1016/j.physb.2014.09.041

Cited by 14 publications

(2 citation statements)

References 26 publications

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“…Three decades after its discovery by Pauli and Fierz [22], it was applied to study the renormalization of quantum electrodynamics by Kramers [23] and was later used to study interactions of atoms with lasers by Henneberger [24]. Within this framework, many outstanding works have been reported by a great number of erudite scholars (see [4,[25][26][27], and references therein).…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Hydrogen atom in a laser-plasma

et al. 2016

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We scrutinize the behaviour of the eigenvalues of a hydrogen atom in a quantum plasma as it interacts with an electric field directed along θ = π and is exposed to linearly polarized intense laser field radiation. We refer to the interaction of the plasma with the laser light as laser-plasma. Using the Kramers-Henneberger (KH) unitary transformation, which is the semiclassical counterpart of the Block-Nordsieck transformation in the quantized field formalism, the squared vector potential that appears in the equation of motion is eliminated and the resultant equation is expressed in the KH frame. Within this frame, the resulting potential and the corresponding wavefunction have been expanded in Fourier series, and using Ehlotzky's approximation we obtain a laser-dressed potential to simulate an intense laser field. By fitting the exponential-cosinescreened Coulomb potential into the laser-dressed potential, and then expanding it in Taylor series up to ( ) α O r , 4 0 9 , we obtain the eigensolution (eigenvalues and wavefunction) of the hydrogen atom in laser-plasma encircled by an electric field, within the framework of perturbation theory formalism. Our numerical results show that for a weak external electric field and a very large Debye screening parameter length, the system is strongly repulsive, in contrast with the case for a strong external electric field and a small Debye screening parameter length, when the system is very attractive. This work has potential applications in the areas of atomic and molecular processes in external fields, including interactions with strong fields and short pulses.

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Section: Formulation Of the Problemmentioning

confidence: 99%

Hydrogen atom in a laser-plasma

et al. 2016

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“…In recent years, intersubband transition (ISBT) of electrons in a quantum well (QW) consisting of group III-V semiconductors has aroused much interest because of its potential applications in optoelectronic devices such as infrared detectors and all-optical switches. [1][2][3][4][5][6][7] Some experiments [8][9][10] gave optical absorption coefficients for ISBT and their dependence on incident photon energy in QW consisting of III-V group materials at varying temperatures and well widths. As for GaAs/Al x Ga 1−x As double quantum wells (DQWs), [11] an early result showed that the frequencies of absorption peaks decrease with increasing well width and temperature.…”

Section: Introductionmentioning

confidence: 99%

Intersubband optical absorption of electrons in double parabolic quantum wells of Al _x Ga _{1−
x} As/Al _y Ga _{1−
y}

Ma
¹
,

Yuan
²
,

S
³

2018

Chinese Phys. B

8
0
4
0

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Some realizable structures of double parabolic quantum wells (DPQWs) consisting of Al x Ga 1−x As /Al y Ga 1−y As are constructed to discuss theoretically the optical absorption due to the intersubband transition of electrons for both symmetric and asymmetric cases with three energy levels of conduction bands. The electronic states in these structures are obtained using a finite element difference method. Based on a compact density matrix approach, the optical absorption induced by intersubband transition of electrons at room temperature is discussed. The results reveal that the peak positions and heights of intersubband optical absorption coefficients (IOACs) of DPQWs are sensitive to the barrier thickness, depending on Al component. Furthermore, external electric fields result in the decrease of peak, and play an important role in the blue shifts of absorption spectra due to electrons excited from ground state to the first and second excited states. It is found that the peaks of IOACs are smaller in asymmetric DPQWs than in symmetric ones. The results also indicate that the adjustable extent of incident photon energy for DPQW is larger than for a square one of a similar size. Our results are helpful in experiments and device fabrication.

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The Effects of Intense Terahertz Laser and Magnetic Fields on Optical Properties of a Shallow Impurity in Semiconductors in the Faraday Configuration
Wei
¹
,
Wang
²
,
Xu
³

et al. 2018
Physica Status Solidi (b)
6
0
0
0
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The influence of intense terahertz laser and magnetic fields on the total optical absorption coefficient for the transitions between shallow‐impurity states 1s and 2p± in semiconductors within the Faraday configuration is studied by using the compact density‐matrix approach, where the energy levels and wave functions of shallow‐impurity states are obtained by using a combination of time‐dependent nonperturbative approach and variational method. We find that the transition energy of shallow‐impurity states and the dipole matrix element can be not only increased but also decreased by varying the external fields via laser‐dressed Coulomb potential. In this way, the saturable absorption and the resonant peak position and magnitude of the total optical absorption coefficient can be effectively tuned with an appropriate choice of the external fields. Moreover, an appreciable effect of cyclotron motion on the total optical absorption coefficient is observed. This gives new degree of freedom in various device applications based on the intradonor transition of electrons.

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The effects of intense laser field and applied electric and magnetic fields on optical properties of an asymmetric quantum well

Cited by 14 publications

References 26 publications

Hydrogen atom in a laser-plasma

Hydrogen atom in a laser-plasma

Intersubband optical absorption of electrons in double parabolic quantum wells of Al _x Ga _{1−
x} As/Al _y Ga _{1−
y}

The Effects of Intense Terahertz Laser and Magnetic Fields on Optical Properties of a Shallow Impurity in Semiconductors in the Faraday Configuration

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The effects of intense laser field and applied electric and magnetic fields on optical properties of an asymmetric quantum well

Cited by 14 publications

References 26 publications

Hydrogen atom in a laser-plasma

Hydrogen atom in a laser-plasma

Intersubband optical absorption of electrons in double parabolic quantum wells of Al x Ga 1− x As/Al y Ga 1− y

The Effects of Intense Terahertz Laser and Magnetic Fields on Optical Properties of a Shallow Impurity in Semiconductors in the Faraday Configuration

Contact Info

Product

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About

Intersubband optical absorption of electrons in double parabolic quantum wells of Al _x Ga _{1−
x} As/Al _y Ga _{1−
y}