Conductance of finite systems in the ballistic regime: the dependence on the Fermi energy, magnetic field, and frequency

1988 ◽  
Vol 21 (35) ◽  
pp. L1147-L1152 ◽  
Author(s):  
B Kramer ◽  
J Masek
Keyword(s):  
Magnetic Field ◽  
Fermi Energy ◽  
Ballistic Regime ◽  
Finite Systems

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.

scholarly journals Temperature and Magnetic-Field-Enhanced Hall Slope of a Dilute 2D Hole System in the Ballistic Regime

2004 ◽  
Vol 93 (25) ◽  
Author(s):  
X. P. A. Gao ◽  
G. S. Boebinger ◽  
A. P. Mills ◽  
A. P. Ramirez ◽  
L. N. Pfeiffer ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ballistic Regime

Spin Polarized Transport through Structures Consist of the Ferromagnetic Semiconductor in Presence of a Inhomogeneous Magnetic Field

2011 ◽  
Vol 194-196 ◽  
pp. 679-682
Author(s):  
Zahra Bamshad
Keyword(s):  
Magnetic Field ◽  
Spin Polarization ◽  
Fermi Energy ◽  
Magnetic Tunnel Junction ◽  
Inhomogeneous Magnetic Field ◽  
Spin Polarized ◽  
Polarized Transport ◽  
Dimensional Electron Gas ◽  
Spin Electronic ◽  
Spin Polarized Transport

The spin-polarized transport is investigated in a magnetic tunnel junction which consists of two ferromagnetic electrodes separated by a magnetic barrier and a nonmagnetic metallic spacer placed in distance above the two dimensional electron gas (2DEG) in presence of an inhomogeneous external modulated magnetic field and a perpendicular wave vector dependent effective potential. Based on the transfer matrix method and the nearly-free-electron approximation the dependence of the conductance and spin polarization on the Fermi energy of the electrons are studied theoretically the. strong oscillations with large amplitude investigated in spin polarization in terms of the Fermi energy due to the inhomogeneous magnetic field. The conductance in terms of the Fermi energy shows no oscillation in low energy but has a strong pick in middle region. this results may be useful for the development of spin electronic devices based on coherent transport, or may be used as a tunable spin-filter.

The Magneto Electron Statistics in Heavily Doped N Type-Intrinsic-P Type-Intrinsic Structures

2021 ◽  
Vol 21 (12) ◽  
pp. 6183-6187
Author(s):  
P. K. Das ◽  
J. Pal ◽  
M. Debbarma ◽  
K. P. Ghatak
Keyword(s):  
Magnetic Field ◽  
Band Structure ◽  
Electron Concentration ◽  
Fermi Energy ◽  
Energy Band ◽  
Electronic Materials ◽  
Numerical Magnitudes ◽  
Heavily Doped ◽  
Quantizing Magnetic Field ◽  
P Type

In this paper we study the Electron Statistics in Heavily Doped N Type-Intrinsic-P Type-Intrinsic structures of non-linear optical, tetragonal and opto-electronic materials in the presence of magnetic quantization. It is found taking such heavily doped structures of Cd3As2, CdGeAs2, InAs, InSb, Hg1−xCdxTe, In1−xGaxAsyP1−y as examples that the Fermi energy (EF) oscillates with inverse quantizing magnetic field (1/B) and increases with increasing electron concentration with different numerical magnitudes which is the signature of respective band structure. The numerical value of the Fermi energy is different in different cases due to the different values of the energy band constants.

RELATIVISTIC ELECTRONS IN A ROTATING SPHERICAL MAGNETIC DIPOLE: LOCALIZED THREE-DIMENSIONAL STATES

1999 ◽  
Vol 08 (02) ◽  
pp. 251-270 ◽  
Author(s):  
JAMES M. GELB ◽  
KAUNDINYA S. GOPINATH ◽  
DALLAS C. KENNEDY
Keyword(s):  
Magnetic Field ◽  
Neutron Star ◽  
Magnetic Dipole ◽  
Fermi Energy ◽  
Three Dimensional ◽  
Relativistic Electrons ◽  
Many Body ◽  
First Case ◽  
The Many ◽  
Body Case

Paralleling a previous paper, we examine single- and many-body states of relativistic electrons in an intense, rotating magnetic dipole field. Single-body orbitals are derived semiclassically and then applied to the many-body case via the Thomas-Fermi approximation. The many-body case is reminiscent of the quantum Hall state. Electrons in a realistic neutron star crust are considered with both fixed density profiles and constant Fermi energy. In the first case, applicable to young neutron star crusts, the varying magnetic field and relativistic Coriolis correction lead to a varying Fermi energy and macroscopic currents. In the second, relevant to older crusts, the electron density is redistributed by the magnetic field.

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