scholarly journals Compressible phase of a double-layer electron system with total Landau-level filling factor 1/2

1993 ◽  
Vol 48 (15) ◽  
pp. 11484-11487 ◽  
Author(s):  
N. E. Bonesteel
Keyword(s):  
Landau Level ◽  
Double Layer ◽  
Filling Factor ◽  
Electron System

CRITICAL CURRENTS AND NEW EXPERIMENTS ON EXCITONIC ELECTRON BILAYER SYSTEMS

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2596-2602
Author(s):  
LARS TIEMANN ◽  
WERNER DIETSCHE ◽  
MAIK HAUSER ◽  
KLAUS v. KLITZING
Keyword(s):  
Double Layer ◽  
Filling Factor ◽  
Direct Consequence ◽  
Bose Condensation ◽  
Critical Currents ◽  
Phase Coherence ◽  
Double Layers

Pure dc interlayer tunneling experiments have found critical currents Icritical in electron double layers at a total filling factor of one. Below Icritical, the four-terminal interlayer resistance is very small but abruptly increases by many orders of magnitude once I > Icritical. The nearly vanishing 4-terminal interlayer resistance is most likely the direct consequence of the interlayer phase-coherence associated with the Bose condensation of the double layer quasi-excitons at total filling factor one.

Transport properties of a two-dimensional electron system at even-denominator fillings of the lowest Landau level

1992 ◽  
Vol 46 (16) ◽  
pp. 10468-10471 ◽  
Author(s):  
H. W. Jiang ◽  
L. W. Engel ◽  
D. C. Tsui ◽  
H. L. Stormer ◽  
L. N. Pfeiffer ◽  
...  
Keyword(s):  
Transport Properties ◽  
Landau Level ◽  
Electron System ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Lowest Landau Level ◽  
Dimensional Electron System

COLLECTIVE EXCITATIONS IN SEMICONDUCTOR AND GRAPHENE BILAYERS IN HIGH MAGNETIC FIELD

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2851-2855
Author(s):  
VERONIKA BISTI
Keyword(s):  
Magnetic Field ◽  
Charge Density ◽  
Ground State ◽  
Asymmetry Parameter ◽  
Filling Factor ◽  
Electron System ◽  
Collective Excitations ◽  
Graphene Layers ◽  
Space Symmetry ◽  
The Difference

The effect of space symmetry on magnetoplasmon charge density and spin-density excitations in a weakly tunnel coupled bilayer electron system at the filling factor ν = 4 is considered. The optic magnetoplasmon energy as well as the energy of intralayer magnetoexciton is not affected by space symmetry. Three other collective magnetoplasmon modes as well as three magnetoexciton modes are determined by relations between the asymmetry parameter, tunnel parameter, and the difference in energies of intralayer and interlayer magnetoexcitons. The charge-density excitations in bilayer graphene at the filling-factor ν ≪ 1 are considered. The presence of small asymmetry of graphene layers is taken into account. It is demonstarted that the magnetoplasmon energy depends on the bilayer ground state.

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