scholarly journals Measurement of the infrared transmission through a single doped GaAs quantum well in an external magnetic field: Evidence for polaron effects

2009 ◽  
Vol 80 (7) ◽  
Author(s):  
C. Faugeras ◽  
M. Orlita ◽  
S. Deutchlander ◽  
G. Martinez ◽  
P. Y. Yu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Well ◽  
Infrared Transmission ◽  
Field Evidence

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.

The Influence of Electromagnetic Wave on the Acoustomagnetoelectric Effect in a Quantum Well with Infinite Potential

2018 ◽  
Vol 789 ◽  
pp. 6-13
Author(s):  
Nguyen Quyet Thang ◽  
Nguyen Van Nghia ◽  
Nguyen Quang Bau
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
External Magnetic Field ◽  
Acoustic Wave ◽  
Quantum Well

The influence of electromagnetic wave (EMW) on the acous- tomagnetoelectric (AME)effect is studied theoretically in a quantum well. The expression of the AME field is obtained. Thedependences of the AME field on the temperature of system, the frequency of acoustic wave, thefrequency and intensity of electromagnetic wave and the parameters of a Quantum well are nonlinear.These dependences in the case of QW are different and more complex than in the case of bulksemiconductor. The results are numerically calculated and discussed for an GaAs/AGaAs QW. Thegraph of the dependence of the AME field on the frequency of acoustic wave shows that the changesof external magnetic field drag on the change of value of AME field and the change of the positionof AME field. The value of the AME field in case with the intensity of EMW is much bigger than incase without the intensity of EMW.

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.

EFFECTS OF A STRONG MAGNETIC FIELD ON INTERFACE EXCITON WITH A HOLE CONFINED IN A QUANTUM WELL

2006 ◽  
Vol 20 (20) ◽  
pp. 2921-2930 ◽  
Author(s):  
VAN THANH NGO ◽  
AI VIET NGUYEN
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Binding Energy ◽  
Variational Method ◽  
Quantum Well ◽  
Interface Plane ◽  
Two Dimensional ◽  
Optical Efficiency ◽  
Magnetic Length ◽  
Coupled Quantum Well

We study by the variational method the effects of external magnetic field on the interface exciton with a hole confined in the quantum well. The main parameters of our model are: the distance d between the interface plane and center of the quantum well, the parameters of quantum well (the half width a and the height V0) and magnetic length λ. We obtained the binding energy and effective optical efficiency of this type of interface exciton. This model can be developed to investigate the properties of two-dimensional excitons in coupled quantum well.1

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