scholarly journals Analysis of dipole matrix element in quantum well and quantum cascade laser under the influence of external magnetic field

2016 ◽  
Vol 13 (1) ◽  
pp. 45-58
Author(s):  
Aleksandar Demic ◽  
Jelena Radovanovic ◽  
Vitomir Milanovic
Keyword(s):  
Magnetic Field ◽  
Perturbation Theory ◽  
Matrix Element ◽  
External Magnetic Field ◽  
Quantum Well ◽  
Quantum Cascade Laser ◽  
Dipole Matrix Element ◽  
Quantum Nanostructures ◽  
Quantum Cascade ◽  
Second Order Perturbation Theory

We present a method for modeling nonparabolicity effects (NPE) in quantum nanostructures by using second order perturbation theory. We will analyze application of this model on a quantum well without external electric field and a quantum cascade laser (QCL). This model will allow us to examine the influence of magnetic field on dipole matrix element in QCL structures which will give better insight how NPE can disrupt gain of QCL structures.

scholarly journals Nonparabolic effects in multiple quantum well structures and influence of external magnetic field on dipole matrix elements

2016 ◽  
Vol 19 (2) ◽  
pp. 39
Author(s):  
Aleksandar Demić ◽  
Jelena Radovanović ◽  
Vitomir Milanović
Keyword(s):  
Magnetic Field ◽  
Matrix Element ◽  
Quantum Well ◽  
Multiple Quantum Well ◽  
Optical Gain ◽  
Multiple Quantum ◽  
Dipole Matrix Element ◽  
Quantum Well Structures ◽  
Quantum Nanostructures ◽  
Field Influence

We present a method of modeling of nonparabolic effects (NPE) in quantum nanostructures by using second order perturbation theory. We apply this model on multiple quantum well structures and consider the influence of external magneticfield on dipole matrix element which is usually considered constant. The dipole matrix element directly influences the optical gain, and our model can provide a better insight to how NPE and magnetic field influence the gain of quantum nanostructures.

Design of a ZnMnSe∕ZnMgSe spin-polarized terahertz quantum cascade laser tunable by magnetic field

2006 ◽  
Vol 89 (1) ◽  
pp. 011109 ◽  
Author(s):  
Ivana Savić ◽  
Zoran Ikonić ◽  
Nenad Vukmirović ◽  
Dragan Indjin ◽  
Paul Harrison ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Cascade Laser ◽  
Quantum Cascade ◽  
Spin Polarized

scholarly journals A perturbation theory approach to the ground state exciton energy in the limit of a weak magnetic field in anomalous exciton Hall effect

2021 ◽  
Vol 2015 (1) ◽  
pp. 012135
Author(s):  
V A Shabashov ◽  
V K Kozin ◽  
A V Kavokin ◽  
I A Shelykh
Keyword(s):  
Magnetic Field ◽  
Perturbation Theory ◽  
Dipole Moment ◽  
External Magnetic Field ◽  
Hall Effect ◽  
Ground State ◽  
Weak Magnetic Field ◽  
State Energy ◽  
Theory Approach ◽  
Exciton Energy

Abstract The anomalous exciton Hall effect is a phenomenon that occurs in a quantum well in the presence of an external magnetic field applied perpendicular to the surface due to the interaction of the exciton dipole moment with an electric field, formed by the charged impurities. The effect was fully described in [1] for different magnetic field regimes. In this paper, we focus on the way the perturbation method was used for finding the ground state energy of an exciton in the limit of a weak magnetic field.

Charge transport spectra in superconductor-InAs/GaSb-superconductor heterostructures

2021 ◽  
Author(s):  
Kuei Sun ◽  
Zhi-qiang Bao ◽  
Wenlong Yu ◽  
Samuel D Hawkins ◽  
John F Klem ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Well ◽  
Charge Transport ◽  
Gate Voltage ◽  
Differential Resistance ◽  
Charge Carrier Density ◽  
Quasi Particle ◽  
Current Voltage ◽  
Current Voltage Relation

Abstract Charge transport physics in InAs/GaSb bi-layer systems has recently attracted attention for the experimental search for two-dimensional topological superconducting states in solids. Here we report measurement of charge transport spectra of nano devices consisting of an InAs/GaSb quantum well sandwiched by tantalum superconductors. We explore the current-voltage relation as a function of the charge-carrier density in the quantum well controlled by a gate voltage and an external magnetic field. We observe three types of differential resistance peaks, all of which can be effectively tuned by the external magnetic field, and, however, two of which appear at electric currents independent of the gate voltage, indicating a dominant mechanism from the superconductor and the system geometry. By analyzing the spectroscopic features, we nd that the three types of peaks identify Andreev reflections, quasi-particle interference, and superconducting transitions in the device, respectively. Our results provide a basis for further exploration of possible topological superconducting state in the InAs/GaSb system.

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