Spin-polarization instability in a tilted magnetic field of a two-dimensional electron gas with filled Landau levels

1985 ◽  
Vol 31 (10) ◽  
pp. 6228-6232 ◽  
Author(s):  
Gabriele F. Giuliani ◽  
J. J. Quinn
Keyword(s):  
Magnetic Field ◽  
Spin Polarization ◽  
Electron Gas ◽  
Landau Levels ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Dimensional Electron Gas ◽  
Tilted Magnetic Field

A Shubnikov-De Haas Study of Tilted Magnetic Field in the HgTe/CdTe Superlattice

1994 ◽  
Vol 299 ◽  
Author(s):  
Ikai Lo ◽  
W. C. Mitchel ◽  
D. Boeringer ◽  
K.A. Harris ◽  
R.W. Yanka ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Temperature Dependence ◽  
Electrostatic Field ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Dimensional Electron Gas ◽  
Tilted Magnetic Field

AbstractWe have measured the Shubnikov-de Haas (SdH) effect in a HgTe/CdTe superlattice (SL) with a tilted magnetic field in the absence of an external electric field. We found that the peaks of the SdH oscillation changed with Bcosθ, indicating the two-dimensional character of the electron gas. The carrier concentration of the two-dimensional electron gas (2DEG) is equal to 2.95×1011 cm−2. The 2DEG shows the existence of a Stark ladder, which is caused by the internal electrostatic field, near the interface between the substrate and the SL. From the temperature dependence of the SdH measurements, we also show that the 3DEG in the SL miniband contributes to the non-oscillatory magnetoresistance and that the mobility of 3DEG in the miniband is lower than that of 2DEG in the Stark ladder.

scholarly journals PSEUDO-GAP AND SPIN POLARIZATION IN A TWO-DIMENSIONAL ELECTRON GAS

2003 ◽  
Vol 02 (06) ◽  
pp. 619-624
Author(s):  
VLADIMIR VYURKOV ◽  
ANDREY VETROV ◽  
VICTOR RYZHII
Keyword(s):  
Magnetic Field ◽  
Spin Polarization ◽  
Electron Gas ◽  
Zero Magnetic Field ◽  
Excitation Density ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Nonmonotonic Dependence ◽  
Dimensional Electron Gas

Tunneling (one-particle excitation) density of states in the vicinity of Fermi level of a two-dimensional electron gas (2DEG) subjected to an external parallel and zero magnetic field is calculated. It reveals a pseudo-gap recently observed in the experiments. The gap originates in spin polarization of 2DEG. Nonmonotonic dependence of energy on a Landau level filling factor (density) for perpendicular magnetic field was also obtained. It implies the tunneling current peculiarities at filling factors of about 1/2 and 1. The Ising-like model of the exchange interaction in 2DEG was exploited instead of the conventional one. It was crucial to achieve even a qualitative agreement with experimental data.

Sign in / Sign up

Export Citation Format

Share Document