Universal conductance fluctuations in a two-dimensional electron gas near filling factor

1996 ◽  
Vol 97 (2) ◽  
pp. 83-87 ◽  
Author(s):  
G.M. Gusev ◽  
D.K. Maude ◽  
X. Kleber ◽  
J.C. Portal ◽  
Z.D. Kvon ◽  
...  
Keyword(s):  
Filling Factor ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Universal Conductance Fluctuations ◽  
Conductance Fluctuations ◽  
Dimensional Electron Gas ◽  
Universal Conductance

scholarly journals Двумерные триплетные магнитоэкситоны и магнетофермионный конденсат в GaAs/AlGaAs гетероструктурах

2018 ◽  
Vol 60 (8) ◽  
pp. 1597
Author(s):  
Л.В. Кулик ◽  
А.В. Горбунов ◽  
А.С. Журавлев ◽  
В.Б. Тимофеев ◽  
И.В. Кукушкин
Keyword(s):  
Filling Factor ◽  
Electron Gas ◽  
External Electromagnetic Field ◽  
Collective State ◽  
High Electron ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Bose Statistics ◽  
Dimensional Electron Gas

AbstractA fundamentally new collective state, namely, the magnetofermionic condensate, is discovered during photoexcitation of a sufficiently dense gas of long-lived triplet cyclotron magnetoexcitons in a twodimensional Hall insulator with a high electron mobility, a filling factor of ν = 2, and temperatures of T < 1 K. The condensed phase coherently interacts with an external electromagnetic field, exhibits superradiant properties in the recombination of correlated condensate electrons with heavy holes in the valence band, and spreads nondissipatively in the layer of a two-dimensional electron gas to macroscopical large distances, transferring an integer spin. The observed effects are explained in terms of a coherent condensate in a nonequilibrium system of two-dimensional fermions with a fully quantized energy spectrum, in which a degenerate ensemble of long-lived triplet magnetoexcitons obeying the Bose statistics is present.

scholarly journals Studies of Chaotic Transport of Electrons in Quantum Boxes

VLSI Design ◽  
1998 ◽  
Vol 6 (1-4) ◽  
pp. 331-334
Author(s):  
D. K. Ferry ◽  
G. Edwards
Keyword(s):  
Chaotic Behavior ◽  
Ballistic Transport ◽  
Electron Gas ◽  
Classical Dynamics ◽  
Dimensional Electron ◽  
Universal Conductance Fluctuations ◽  
Conductance Fluctuations ◽  
Chaotic Transport ◽  
Dimensional Electron Gas ◽  
Universal Conductance

Recent studies of transport through ballistic quantum dot resonators have revealed a complex array of behavior, including the existence of "universal" conductance fluctuations which are presumed to arise from the chaotic behavior of the underlying classical dynamics. In this paper, the results of studies on the classical ballistic transport of carriers, within a quasi-two-dimensional electron gas, through a 1.0 micron square structure in a magnetic field are presented.

MAGNETIZATION OF A BILAYER 2D ELECTRON GAS

2004 ◽  
Vol 18 (27n29) ◽  
pp. 3665-3670 ◽  
Author(s):  
I. M. A. BOMINAAR-SILKENS ◽  
M. R. SCHAAPMAN ◽  
U. ZEITLER ◽  
P. C. M. CHRISTIANEN ◽  
J. C. MAAN ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Landau Level ◽  
Filling Factor ◽  
Electron Gas ◽  
Single Layer ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Torque Magnetometry ◽  
Dimensional Electron Gas

We present torque-magnetometry measurements of a bilayer two-dimensional electron gas (2DEG) with an inter-well barrier thin enough to enable a strong coupling between the quantum wells. We observe magnetization steps related to symmetric–anti-symmetric (SAS) transitions. Increasing the in-plane magnetic field leads to a reduction of the SAS splitting. Surprisingly, the heights of the magnetization steps related to Landau-level transitions are reduced relative to those measured for single-layer 2DEGs, suggesting that an in-plane magnetization component plays a role. Finally, at total filling factor ν=4, we observe an unidentified magnetization peak superposed upon the Landau-level step.

CONDUCTANCE FLUCTUATIONS IN A TWO-DIMENSIONAL ELECTRON GAS IN THE TUNNELING AND HOPPING REGIMES

1994 ◽  
Vol 08 (07) ◽  
pp. 809-817 ◽  
Author(s):  
DRAGANA POPOVIĆ ◽  
S. WASHBURN ◽  
A.B. FOWLER
Keyword(s):  
Chemical Potential ◽  
Electron Gas ◽  
Localized States ◽  
Sample Length ◽  
Complex Behavior ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Conductance Fluctuations ◽  
Dimensional Electron Gas

We report results of low temperature conductance measurements made on a wide two-dimensional electron gas as a function of sample length L and temperature, in a regime where conduction proceeds via tunneling or hopping through channels of localized states. We extend our recent study of the behavior of the ensemble averaged logarithm of conductance <ln G> and focus on fluctuations of conductance as a function of the chemical potential μ, which occur on at least three characteristic gate voltage scales VC. A detailed study of VC and variance vs. L and T for those three types of fluctuations reveals a complex behavior, probably caused by several competing effects. Our results suggest that both disorder and electron-electron interactions have to be taken into account to describe the properties of our samples.

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