Coherent Energy Transport between Coupled Quantum Wells Studied by Two-Dimensional Terahertz Spectroscopy

2010 ◽  
Author(s):  
W. Kuehn ◽  
K. Reimann ◽  
M. Woerner ◽  
T. Elsaesser ◽  
R. Hey
Keyword(s):  
Quantum Wells ◽  
Energy Transport ◽  
Terahertz Spectroscopy ◽  
Two Dimensional ◽  
Coupled Quantum Wells

scholarly journals Исследование параметров двумерного электронного газа в квантовых ямах InGaN/GaN методом терагерцового плазмонного резонанса

2021 ◽  
Vol 55 (11) ◽  
pp. 1059
Author(s):  
Е.Р. Бурмистров ◽  
Л.П. Авакянц
Keyword(s):  
Quantum Wells ◽  
Terahertz Spectroscopy ◽  
Radiation Power ◽  
Electron Gas ◽  
Femtosecond Laser Pulses ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Plasmon Resonances ◽  
Dimensional Electron Gas

A new approach to determining the parameters of a two-dimensional electron gas in InGaN/GaN quantum wells is proposed. It is based on the method of terahertz spectroscopy with time resolution, within the framework of which the terahertz frequencies of two-dimensional plasmon resonances excited in the studied samples of InGaN/AlGaN/GaN heterostructures by femtosecond laser pulses at a wavelength of 797 nm were recorded. Oscillating behavior of the output terahertz radiation power with minima in the frequency range 1−5 THz is shown, which is associated with the excitation of plasmon oscillations in a two-dimensional electron gas localized in an InGaN/GaN quantum well. During the processing of terahertz spectra, the effect of renormalization of the effective mass of two-dimensional electron gas, as well as phase modulation near the frequencies of plasmon resonances with an increase in the temperature of the sample from 90 to 170 K, was found. The proposed method is non-contact and can be used in a wide temperature range.

scholarly journals Hot Electron Modelling of HEMTs

VLSI Design ◽  
2001 ◽  
Vol 13 (1-4) ◽  
pp. 287-293 ◽  
Author(s):  
Eric A. B. Cole ◽  
Christopher M. Snowden ◽  
Shahzad Hussain
Keyword(s):  
Finite Difference ◽  
Difference Scheme ◽  
Quantum Wells ◽  
Numerical Solution ◽  
Conduction Band ◽  
Finite Difference Scheme ◽  
Energy Transport ◽  
Two Dimensional ◽  
Hot Electron ◽  
Recessed Gate

The hot-electron two-dimensional HEMT with recessed gate is modelled by solving the Poisson, current continuity and energy transport equations consistently with the Schrödinger equation using a finite difference scheme. New expressions are used for the energy densities inside and outside the quantum wells. A method is described for pinning the conduction band at the contact edge to produce an extremely stable numerical solution. Results are presented for an eight layer GaAs-ALGaAs-InGaAs device.

MANY-BODY EFFECTS IN FRICTIONAL DRAG BETWEEN COUPLED TWO-DIMENSIONAL ELECTRON SYSTEMS

1999 ◽  
Vol 13 (05n06) ◽  
pp. 469-478
Author(s):  
BEN YU-KUANG HU
Keyword(s):  
Quantum Wells ◽  
Quantitative Measure ◽  
Voltage Response ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Many Body ◽  
Frictional Drag ◽  
Electron Gases ◽  
Coupled Quantum Wells ◽  
Many Body Effects

Independently contacted coupled quantum wells separated by barriers which allow significant interlayer interactions but no tunneling have been fabricated. When current is passed through one layer, the interlayer interactions drag carriers in the second layer, resulting in a voltage response (for open circuits). The magnitude of the response gives a quantitative measure of the effective interlayer interactions and response functions of the system, and hence this is an excellent laboratory for the study of many-body phenomena in two-dimensional electron gases. We review the Boltzmann and Kubo formalisms for the theory of drag effects in coupled quantum wells and discuss three specific cases where many-body effects significantly affect the drag: (1) acoustic phonon-mediated drag, (2) large enhancements due to coupled plasmon modes, and (3) interplay of screening and Landau levels in large magnetic fields.

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