Spin Filters and Switchers in Topological-Insulator Junctions

Lü, Xiao-Long; Xie, Hang

doi:10.1103/physrevapplied.12.064040

Cited by 25 publications

(20 citation statements)

References 35 publications

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“…Also, ℓ is the buckling height and ξ i is equal to +1(−1) for the upper (lower) sublattice. The last term is related to antiferromagnetic exchange field [29,40]. H eγ = e me A .…”

Section: Model and Methodsmentioning

confidence: 99%

Perfect optical spin-filtering in antiferromagnetic stanene nanoribbons induced by band bending and uniaxial strain

Rahimi¹,

Phirouznia²

2022

Preprint

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Non-equilibrium spin-polarized transport properties of antiferromagnetic stanene nanoribbons are theoretically studied under the combining effect of a normal electric field and linearly polarized irradiation based on the tight-binding model at room temperature. Due to the existence of spinorbit coupling in stanene lattice, applying normal electric field leads to splitting of band degeneracy of spin-resolved energy levels in conduction and valence bands. Furthermore, unequivalent absorption of the polarized photons at two valleys which is attributed to an antiferromagnetic exchange field results in unequal spin-polarized photocurrent for spin-up and spin-down components. Interestingly, in the presence of band bending which has been induced by edge potentials, an allowable quantum efficiency occurs over a wider wavelength region of the incident light. It is especially important that the variation of an exchange magnetic field generates spin semi-conducting behavior in the bended band structure. Moreover, it is shown that optical spin-filtering effect is obtained under the simultaneous effect of uniaxial strain and narrow edge potential.

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“…Also, ℓ is the buckling height and ξ i is equal to +1(−1) for the upper (lower) sublattice. The last term is related to antiferromagnetic exchange field [29,40]. H eγ = e me A .…”

Section: Model and Methodsmentioning

confidence: 99%

Perfect optical spin-filtering in antiferromagnetic stanene nanoribbons induced by band bending and uniaxial strain

Rahimi¹,

Phirouznia²

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…To study the electron transport details through such systems, we plot the local current in the conductor and lead regions. The energy-resolved bond current between the site i and site j is given by the formula below [36,38] J…”

Section: Model and Methodsmentioning

confidence: 99%

Topological spin–valley filtering effects based on hybrid silicene-like nanoribbons

Yang

Zhang

et al. 2020

New J. Phys.

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Topological edge states have crucial applications in nano spintronics and valleytronics devices, while topological inner-edge states have seldom been extensively researched in this field. Based on the inner-edge states of the hybridized zigzag silicene-like nanoribbons, we investigate their transport properties. We propose two types of spin-valley filters. The first type can generate two different spin-valley polarized currents in output leads, respectively. The second type outputs the specific spin-valley polarized current in only one of the output leads. All these inner-edge states have the spin-valley-momentum locking property. These types of filters can switch the output spin-valley polarizations by modulating the external fields. Besides, we also find that the device size plays a crucial role in designing these spin-valley filters. Moreover, the local current distributions are calculated to visualize the detailed transport process and understand the mechanism. The mechanism lies that the spin-valley polarized current can nearly freely pass through the system with the same momentum, spin and valley degrees of freedom. The small reflection of the current results from the inter-valley scattering. In particular, we also consider the realistic (disorder) effects on the performance of these filters to ensure the robustness of our systems. We believe these spin-valley current filtering effects have potential applications in the future spintronics and valleytronics device designs.

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“…In our previous work [4], we used the topological edge states to design different types of the filters and switchers in the zigzag silicene nanoribbon without the edge magnetism. In the following, the focus of our discussions is to investigate the transport properties of these edge states (shown in figures 2 and 4) in the zigzag StNR with the edge magnetism.…”

Section: Transport Properties Of the Topological Edges With Magnetism...mentioning

confidence: 99%

Topological edge states and transport properties in zigzag stanene nanoribbons with magnetism

Lü

Xie

2022

New J. Phys.

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In this work, we investigate the topological phase transitions and corresponding transport properties in zigzag stanene nanoribbon with different magnetism. The results show that the off-resonant circularly polarized (ORCP) light may induce anisotropic chiral edge state with a magnetic phase transition from antiferromagnetic state to nonmagnetic state. In combination with the ORCP light and electric field, the 100% spin-polarized edge state can be induced with some magnetic orders. The finite-size effect is also an important factor for the magnetic phase transitions, which in turn induces topological phase transitions from the band insulator to topological phases. By constructing the topological-insulator junctions with some topological edge states, we further study the Fabry-Perot resonant, where multiple reflection edge states cause strong current loops. By modulating the ORCP and electric field, the system can also be regarded as a switcher, to control the charge current or spin polarized current. These findings pave a way for designing topological device with magnetic edges in the future nano spintronics.

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Spin Filters and Switchers in Topological-Insulator Junctions

Cited by 25 publications

References 35 publications

Perfect optical spin-filtering in antiferromagnetic stanene nanoribbons induced by band bending and uniaxial strain

Perfect optical spin-filtering in antiferromagnetic stanene nanoribbons induced by band bending and uniaxial strain

Topological spin–valley filtering effects based on hybrid silicene-like nanoribbons

Topological edge states and transport properties in zigzag stanene nanoribbons with magnetism

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