Magnetic-field-induced excitonic instability in the 2D electron gas

1992 ◽  
Vol 263 (1-3) ◽  
pp. 482-484 ◽  
Author(s):  
Gerrit E.W. Bauer
Keyword(s):  
Magnetic Field ◽  
Electron Gas ◽  
2D Electron Gas

scholarly journals TRANSPORT PROPERTIES OF 2D ELECTRON GAS IN AN n-InGaAs/GaAs DQW IN A VICINITY OF LOW MAGNETIC-FIELD-INDUCED HALL INSULATOR–QUANTUM HALL LIQUID TRANSITION

2007 ◽  
Vol 06 (03n04) ◽  
pp. 173-177
Author(s):  
YU. G. ARAPOV ◽  
S. V. GUDINA ◽  
G. I. HARUS ◽  
V. N. NEVEROV ◽  
N. G. SHELUSHININA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Gas ◽  
Quantum Hall ◽  
Zero Magnetic Field ◽  
Double Quantum ◽  
Ballistic Regime ◽  
2D Electron Gas ◽  
Double Quantum Well ◽  
Liquid Transition ◽  
Low Magnetic Field

The resistivity (ρ) of low mobility dilute 2D electron gas in an n- InGaAs / GaAs double quantum well (DQW) exhibits the monotonic "insulating-like" temperature dependence (dρ/dT < 0) at T = 1.8–70 K in zero magnetic field. This temperature interval corresponds to a ballistic regime (kBTτ/ħ > 0.1–3.5) for our samples, and the electron density is on an "insulating" side of the so-called B = 0 2D metal–insulator transition. We show that the observed features of localization and Landau quantization in a vicinity of the low magnetic-field-induced insulator–quantum Hall liquid transition is due to the σxy(T) anomalous T-dependence.

Absence of delocalised states in a 2D electron gas in a magnetic field below ωcτ=1

1996 ◽  
Vol 100 (4) ◽  
pp. 269-273 ◽  
Author(s):  
G.M. Gusev ◽  
U. Gennser ◽  
X. Kleber ◽  
D.K. Maude ◽  
J.C. Portal ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Gas ◽  
2D Electron Gas
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