Linear combination of bulk bands method for investigating the low-dimensional electron gas in nanostructured devices

2005 ◽  
Vol 72 (16) ◽  
Author(s):  
David Esseni ◽  
Pierpaolo Palestri
Keyword(s):  
Linear Combination ◽  
Electron Gas ◽  
Dimensional Electron ◽  
Dimensional Electron Gas ◽  
Low Dimensional

Low-dimensional electron gas at semiconductor surfaces

2007 ◽  
Vol 142 (11) ◽  
pp. 617-626 ◽  
Author(s):  
I. Barke ◽  
R. Bennewitz ◽  
J.N. Crain ◽  
S.C. Erwin ◽  
A. Kirakosian ◽  
...  
Keyword(s):  
Electron Gas ◽  
Semiconductor Surfaces ◽  
Dimensional Electron ◽  
Dimensional Electron Gas ◽  
Low Dimensional

DYNAMICAL CONDUCTIVITY OF LOW-DIMENSIONAL SYSTEMS

2002 ◽  
Vol 16 (10) ◽  
pp. 1511-1531 ◽  
Author(s):  
A. C. SHARMA ◽  
A. BAJPAI
Keyword(s):  
Quantum Wire ◽  
Collective Excitation ◽  
Electron Gas ◽  
Experimental Result ◽  
Dimensional System ◽  
Dimensional Electron ◽  
Dimensional Electron Gas ◽  
Low Dimensional ◽  
Wire System ◽  
Dynamical Conductivity

A calculation of dynamical conductivity is performed for low-dimensional systems, by taking into account the screening of field. Our calculation is valid for all value of wave vector and frequency. The Drude conductivity of three, two and one-dimensional free electron gas, layered electron gas and quantum wire system can be deduced from our calculation. However, our calculation suggests that the use of Drude formulae of conductivity to explain experimental result on microwave and infra-red conductivity, in long wave length limit, can be highly erroneous in case of low-dimensional system that offer larger value of relaxation time. It is found that; (i) screening of a dynamical field becomes less significant on reduction in dimensionality and (ii) unlike the case of three dimensional electron gas, transverse electric field cannot excite collective excitation modes (penetration depth cannot be defined) in a two-dimensional electron gas and quantum wire system. In comparison with prior reported calculation ours is more rigorous calculation as it includes the possibility of propagation of collective excitation modes in all direction. The plasmons in a low-dimensional system cannot be excited for negligibly small value of momentum transfer.

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