Magneto-optical absorption and refraction changes of a bound polaron in a group II–VI asymmetric quantum well

Electric field influences on the electronic states and the optical absorption in an asymmetrical quantum well with semiparabolic potential are investigated. The formula for the absorption coefficients in this asymmetrical quantum well with electric field are deduced by applying iterative method and density-matrix approach. The results are discussed with GaAs/AlGaAs materials and show that the external electric field has a significant effect on the electronic states and absorption coefficients of asymmetric quantum wells.

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Optical absorption coefficients in asymmetric quantum well

Physics Letters A ◽

10.1016/j.physleta.2019.125983 ◽

2019 ◽

Vol 383 (34) ◽

pp. 125983 ◽

Cited By ~ 4

Author(s):

Chaojin Zhang ◽

Cong Min ◽

Bo Zhao

Keyword(s):

Optical Absorption ◽

Quantum Well ◽

Absorption Coefficients ◽

Asymmetric Quantum

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Optical absorption in the terahertz region in HgTe/HgCd(Mn)Te double quantum well structures with a topological phase and structural inversion asymmetry

Surface Science ◽

10.1016/j.susc.2020.121780 ◽

2021 ◽

Vol 706 ◽

pp. 121780

Author(s):

M. Marchewka ◽

P. Śliż

Keyword(s):

Optical Absorption ◽

Quantum Well ◽

Double Quantum ◽

Topological Phase ◽

Quantum Well Structures ◽

Terahertz Region ◽

Double Quantum Well ◽

Structural Inversion ◽

Inversion Asymmetry

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TRANSITION FREQUENCY OF STRONG-COUPLING IMPURITY BOUND POLARON IN AN ASYMMETRIC QUANTUM DOT

International Journal of Nanoscience ◽

10.1142/s0219581x12500263 ◽

2012 ◽

Vol 11 (03) ◽

pp. 1250026 ◽

Cited By ~ 4

Author(s):

CHENG-SHUN WANG ◽

YU-FANG CHEN ◽

JING-JIN XIAO

Keyword(s):

Excited State ◽

Coupling Strength ◽

State Energy ◽

Transition Frequency ◽

Phonon Coupling ◽

Excited State Energy ◽

Bound Polaron ◽

Asymmetric Quantum Dot ◽

Asymmetric Quantum ◽

Electron Phonon Coupling

Properties of the excited state of strong-coupling impurity bound polaron in an asymmetric quantum dot are studied by using linear combination operator and unitary transformation methods. The first internal excited state energy, the excitation energy and the transition frequency between the first internal excited and the ground states of the impurity bound polaron as functions of the transverse and the longitudinal effective confinement lengths of the dot, the electron–phonon coupling strength and the Coulomb bound potential were derived. Our numerical results show that they will increase with decreasing the effective confinement lengths, due to interesting quantum size confining effects. But they are an increasing functions of the Coulomb bound potential. The first internal excited state energy is a decreasing function of the electron–phonon coupling strength whereas the transition frequency and the excitation energy are an increasing one of the electron–phonon coupling strength.

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LINEAR AND NONLINEAR INTERSUBBAND OPTICAL ABSORPTION OF FINITE AND INFINITE SEMI-PARABOLIC QUANTUM WELLS

Modern Physics Letters B ◽

10.1142/s0217984911025882 ◽

2011 ◽

Vol 25 (07) ◽

pp. 497-507 ◽

Cited By ~ 1

Author(s):

M. J. KARIMI ◽

A. KESHAVARZ ◽

A. POOSTFORUSH

Keyword(s):

Refractive Index ◽

Optical Properties ◽

Optical Absorption ◽

Quantum Well ◽

Quantum Wells ◽

Resonant Peak ◽

Energy Eigenvalues ◽

Finite Case ◽

Infinite Case ◽

Index Changes

In this work, the optical absorption coefficients and the refractive index changes for the infinite and finite semi-parabolic quantum well are calculated. Numerical calculations are performed for typical GaAs / Al x Ga 1-x As semi-parabolic quantum well. The energy eigenvalues and eigenfunctions of these systems are calculated numerically. Optical properties are obtained using the compact density matrix approach. Results show that the energy eigenvalues and the matrix elements of the infinite and finite cases are different. The calculations reveal that the resonant peaks of the optical properties of the finite case occur at lower values of the incident photon energy with respect to the infinite case. Results indicate that the maximum value of the refractive index changes for the finite case are greater than that of the infinite case. Our calculations also show that in contrast to the infinite case, the resonant peak value of the total absorption coefficient in the case of the finite well is a non-monotonic function of the semi-parabolic confinement frequency.

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