Spin-polarized electron transport and emission from strained superlattices

2001 ◽  
Author(s):  
Yuri A. Mamaev ◽  
Arsen V. Subashiev ◽  
Yuri P. Yashin ◽  
Anton N. Ambrajei ◽  
Alexander V. Roschansky
Keyword(s):  
Electron Transport ◽  
Spin Polarized

Strain modulation on spin transport properties of PTB junction with MoC2 electrodes

2021 ◽  
Author(s):  
Yaoxing Sun ◽  
Bei Zhang ◽  
shidong zhang ◽  
Dan Zhang ◽  
Jiwei Dong ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Electron Transport ◽  
Transport Properties ◽  
Density Functional ◽  
Spin Transport ◽  
Functional Theory ◽  
Spintronic Devices ◽  
Spin Polarized ◽  
Electron Transport Properties ◽  
Strain Modulation

Based on MoC2 nanoribbons and poly-(terphenylene-butadiynylene) (PTB) molecules, we designed MoC2-PTB molecular spintronic devices and investigated their spin-dependent electron transport properties by using spin-polarized density functional theory and non-equilibrium Green's...

Electronic properties of semiconductor quantum wires for shallow symmetric and asymmetric confinements

2021 ◽  
Author(s):  
Irina I. Yakimenko ◽  
Ivan P. Yakimenko
Keyword(s):  
Electron Transport ◽  
Density Functional ◽  
Quantum Wires ◽  
Zero Magnetic Field ◽  
Electron Interaction ◽  
Spin Polarized ◽  
Quantum Point ◽  
Dimensional Electron Gas ◽  
The One ◽  
Quantum Technology

Abstract Quantum wires (QWs) and quantum point contacts (QPCs) have been realized in GaAs/AlGaAs heterostructures in which a two-dimensional electron gas (2DEG) resides at the interface between GaAs and AlGaAs layered semiconductors. The electron transport in these structures has previously been studied experimentally and theoretically, and a 0.7 conductance anomaly has been discovered. The present paper is motivated by experiments with a QW in shallow symmetric and asymmetric confinements that have shown additional conductance anomalies at zero magnetic field. The proposed device consists of a QPC that is formed by split gates and a top gate between two large electron reservoirs. This paper is focused on the theoretical study of electron transport through a wide top-gated QPC in a low-density regime and is based on density functional theory. The electron-electron interaction and shallow confinement make the splitting of the conduction channel into two channels possible. Each of them becomes spin-polarized at certain split and top gates voltages and may contribute to conductance giving rise to additional conductance anomalies. For symmetrically loaded split gates two conduction channels contribute equally to conductance. For the case of asymmetrically applied voltage between split gates conductance anomalies may occur between values of 0.25(2e2/h) and 0.7(2e2/h) depending on the increased asymmetry in split gates voltages. This corresponds to different degrees of spin-polarization in the two conduction channels that contribute differently to conductance. In the case of a strong asymmetry in split gates voltages one channel of conduction is pinched off and just the one remaining channel contributes to conductance. We have found that on the perimeter of the anti-dot there are spin-polarized states. These states may also contribute to conductance if the radius of the anti-dot is small enough and tunnelling between these states may occur. The spin-polarized states in the QPC with shallow confinement tuned by electric means may be used for the purposes of quantum technology.

Spin Polarized Electron Transport and Emission from Strained Semiconductor Heterostructures

2001 ◽  
pp. 373-382
Author(s):  
Yu. A. Mamaev ◽  
A. V. Subashievf ◽  
Yu. P. Yashin ◽  
A. N. Ambrazhei ◽  
H.-J. Drouhin ◽  
...  
Keyword(s):  
Electron Transport ◽  
Semiconductor Heterostructures ◽  
Spin Polarized

Perfect spin-filter devices based on zigzag zinc oxide nanoribbons

2016 ◽  
Vol 30 (32n33) ◽  
pp. 1650392 ◽  
Author(s):  
Zi-Yue Zhang
Keyword(s):  
Zinc Oxide ◽  
Electron Transport ◽  
Spin Polarization ◽  
Bias Voltage ◽  
First Principles ◽  
External Fields ◽  
Spin Filter ◽  
Spin Polarized ◽  
Spin Filters ◽  
Filtering Effect

Spin-polarized electron transport through a zigzag zinc oxide nanoribbon (ZnONR) has been studied using first-principles transport simulations. Ribbons without edges passivated show 100% spin polarization at small bias voltage independently of width. The ribbons with edge zinc atoms passivated maintain absolute spin-filtering effect in much larger bias region. The results demonstrate that zigzag ZnONRs act as perfect spin-filters in the absence of magnetic electrodes and external fields.

Electronic structure mechanism of spin-polarized electron transport in a Ni–C60–Ni system

2007 ◽  
Vol 439 (1-3) ◽  
pp. 110-114 ◽  
Author(s):  
Haiying He ◽  
Ravindra Pandey ◽  
Shashi P. Karna
Keyword(s):  
Electronic Structure ◽  
Electron Transport ◽  
Spin Polarized

VOLTAGE-TUNABLE SPIN POLARIZATION OF TWO-DIMENSIONAL ELECTRON GAS IN FERROMAGNETIC/SEMICONDUCTOR HYBRID NANOSYSTEM

2006 ◽  
Vol 13 (05) ◽  
pp. 599-605
Author(s):  
MAOWANG LU
Keyword(s):  
Electron Transport ◽  
Applied Voltage ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Alternative Scheme ◽  
Spin Polarized ◽  
Dimensional Electron Gas ◽  
Hybrid Nanosystem

The spin-dependent electron transport in a two-dimensional electron gas (2DEG) modulated by a stripe of magnetized ferromagnetic metal under an applied voltage was investigated theoretically. It is revealed that highly spin-polarized current can be achieved in this kind of nanosystems. It is also shown that the spin polarity of the electron transport can be switched by adjusting the applied voltage to the stripe in the device. These interesting properties may provide an alternative scheme to spin polarize electrons into semiconductors, and this device may be used as a voltage-tunable spin filter.

Spin-polarized electron transport through magnetic poly-BIPO molecule: the role of soliton–antisoliton separation

2015 ◽  
Vol 90 (2) ◽  
pp. 195-200
Author(s):  
N Sadeghi ◽  
S A Ketabi ◽  
N Shahtahmassebi ◽  
M R Abolhassani
Keyword(s):  
Electron Transport ◽  
Spin Polarized
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