Theory of electronic density of states of a two‐dimensional disordered system in the presence of a strong magnetic field (invited)

1988 ◽  
Vol 64 (10) ◽  
pp. 5465-5468 ◽  
Author(s):  
S. Das Sarma ◽  
X. C. Xie
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Density Of States ◽  
Two Dimensional ◽  
Disordered System ◽  
Electronic Density ◽  
Electronic Density Of States

Coulomb Gap in the Tunneling Density of States of Two-Dimensional Electron Liquid in a Strong Magnetic Field

1994 ◽  
Vol 08 (07) ◽  
pp. 913-921
Author(s):  
A.L. Efros ◽  
F.G. Pikus
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Density Of States ◽  
Tunneling Current ◽  
Double Quantum ◽  
Two Dimensional ◽  
Classical Electron ◽  
Coulomb Gap ◽  
Double Quantum Well ◽  
Single Well

A model of a classical electron liquid without external disorder is applied to two-dimensional electrons in a strong magnetic field. Computer modeling gives a quantitative explanation for the recently observed gap in the tunneling current of a double quantum well structure. We find that both the Coulomb gap in the single-well density of states and the correlation of electron motion in the two wells are responsible for the tunneling gap. We show that the classical liquid model provides an accurate description of the low temperature compressibility obtained from magnetocapacitance experiment.

A Modified Extended Hückel Calculations For Q1D-Graphites

1990 ◽  
Vol 214 ◽  
Author(s):  
D. Raković ◽  
R. Kostić ◽  
S. Krstić ◽  
I. Davidova ◽  
B. L. Fayfel ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Density Of States ◽  
Computational Results ◽  
Two Dimensional ◽  
Electronic Density ◽  
Electronic Density Of States ◽  
Energy Gaps ◽  
Extended Hückel ◽  
Extended Hückel Calculations

ABSTRACTIn this paper we have computed electronic density of states for several Q1D graphites: polyacene (PA), polyacenacene (PAA), polyphenanthrene (PP), polyphenanthrophenanthrene (PPhP), and polyperinaphthalene (PPN). The modified extended Hiickel method for finite Q1D chains has been adopted. The change of the electronic properties due to the growth of the Q1D-graphites toward the two-dimensional direction, starting from trans-polyacetylene, cis-polyacetylene or poly(p-phenylene), is discussed. Our calculations show that PA, PAA, and PPN are intrinsic conductors, while PP and PPh are semiconductors with energy gaps of 1,4 eV and 0,8 eV, respectively. The comparison with other computational results is presented.

Sign in / Sign up

Export Citation Format

Share Document