scholarly journals Valley and spin polarization manipulated by electric field in magnetic silicene superlattice

2018 ◽  
Vol 67 (8) ◽  
pp. 086801
Author(s):  
Hou Hai-Yan ◽  
Yao Hui ◽  
Li Zhi-Jian ◽  
Nie Yi-Hang
Keyword(s):  
Electric Field ◽  
Spin Polarization

RESONANT SPIN POLARIZATION IN A TWO-DIMENSIONAL HOLE GAS

2011 ◽  
Vol 25 (15) ◽  
pp. 1259-1270
Author(s):  
TIANXING MA
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Spin Polarization ◽  
Zeeman Splitting ◽  
Resonant Peak ◽  
Two Dimensional ◽  
Structural Inversion ◽  
Inversion Asymmetry ◽  
Peak Increase ◽  
Luttinger Hamiltonian

Within the Luttinger Hamiltonian, electric-field-induced resonant spin polarization of a two-dimensional hole gas in a perpendicular magnetic field was studied. The spin polarization arising from splitting between the light and the heavy hole bands shows a resonant peak at a certain magnetic field. Especially, the competition between the Luttinger term and the structural inversion asymmetry leads to a rich resonant peaks structure, and the required magnetic field for the resonance may be effectively reduced by enlarging the effective width of the quantum well. Furthermore, the Zeeman splitting tends to move the resonant spin polarization to a relative high magnetic field and destroy these rich resonant spin phenomena. Finally, both the height and the weight of the resonant peak increase as the temperature decreases. It is believed that such resonant spin phenomena may be verified in the sample of a two-dimensional hole gas, and it may provide an efficient way to control spin polarization by an external electric field.

scholarly journals Current-Induced Spin Photocurrent in GaAs at Room Temperature

Sensors ◽  
2022 ◽  
Vol 22 (1) ◽  
pp. 399
Author(s):  
Yang Zhang ◽  
Yu Liu ◽  
Xiao-Lan Xue ◽  
Xiao-Lin Zeng ◽  
Jing Wu ◽  
...  
Keyword(s):  
Electric Field ◽  
Spin Polarization ◽  
Applied Electric Field ◽  
Room Temperature ◽  
Polarization Direction ◽  
Applied Bias ◽  
Applied Bias Voltage ◽  
Sample Plane ◽  
Bulk Gaas ◽  
Circularly Polarized

Circularly polarized photocurrent, observed in p-doped bulk GaAs, varies nonlinearly with the applied bias voltage at room temperature. It has been explored that this phenomenon arises from the current-induced spin polarization in GaAs. In addition, we found that the current-induced spin polarization direction of p-doped bulk GaAs grown in the (001) direction lies in the sample plane and is perpendicular to the applied electric field, which is the same as that in GaAs quantum well. This research indicates that circularly polarized photocurrent is a new optical approach to investigate the current-induced spin polarization at room temperature.

Tuning the electronic and magnetic properties of Mn-doped graphene by gas adsorption and effect of external electric field: First-principles study

2019 ◽  
Vol 33 (16) ◽  
pp. 1950166
Author(s):  
Huan Ma ◽  
Ling Ma ◽  
Liang-Cai Ma
Keyword(s):  
Magnetic Properties ◽  
Electric Field ◽  
External Electric Field ◽  
Spin Polarization ◽  
First Principles ◽  
Density Functional ◽  
Gas Adsorption ◽  
Electronic And Magnetic Properties ◽  
Doped Graphene ◽  
Mn Doped

The effect of gas molecule (H2CO, NO, NO2, O2 and SO2) adsorption on the electronic and magnetic properties of Mn-doped graphene (MnG) is investigated by first-principles calculations in the framework of density functional theory (DFT). Our study reveals that after H2CO, NO, NO2 and SO2 adsorption, MnG transforms from half-metal to semiconductor, and this transformation indicates that MnG’s conductivity is changed significantly. Meanwhile, O2 adsorption has no influence on MnG’s original electronic property. Therefore, the substrate of MnG is highly sensitive to H2CO, NO, NO2 and SO2. The reconfiguration of electron distribution caused by gas adsorption dramatically alters the spin polarization distribution of the combined system, that is, NO2 and H2CO adsorption leads to local spin polarization, whereas O2, NO and SO2 adsorption result in complete spin polarization. In addition, the external electric field (E-field) is varied from −0.50 V/Å to +0.50 V/Å then applied to the adsorption system. A strong interaction is observed between gas and MnG with a positive E-field as reflected in the enhancement of adsorption energy. The interaction is obviously weakened by introducing the E-field in the negative direction. Hence, the adsorption strength and sensitivity of gas on MnG can be effectively tuned by the E-field. The results can serve as useful references for the design of graphene-based gas sensor.

Electric-Field-Dependent Spin Polarization in GdN Spin Filter Tunnel Junctions

2013 ◽  
Vol 25 (39) ◽  
pp. 5581-5585 ◽  
Author(s):  
Avradeep Pal ◽  
K. Senapati ◽  
Z. H. Barber ◽  
M. G. Blamire
Keyword(s):  
Electric Field ◽  
Spin Polarization ◽  
Tunnel Junctions ◽  
Spin Filter ◽  
Field Dependent

Electric Field Induced Reversal of Spin Polarization, Magnetic Anisotropy and Tailored Dzyaloshinskii-Moriya Interaction in Underoxidized SrRuO3/SrTiO3 Heterostructures

2021 ◽  
Author(s):  
Zengjie Li ◽  
Xiang Liu ◽  
Jiawei Jiang ◽  
Wenbo Mi ◽  
Haili Bai
Keyword(s):  
Magnetic Properties ◽  
Energy Consumption ◽  
Electric Field ◽  
Spin Polarization ◽  
Low Energy ◽  
Oxide Heterostructures ◽  
Perovskite Type Oxide ◽  
Low Energy Consumption ◽  
Perovskite Type ◽  
Moriya Interaction

Electric field tailored magnetic properties of perovskite-type oxide heterostructures are important in spintronics devices with low energy consumption and small size. Here, the electric field modulated magnetic properties of underoxidized...

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