Rashba-Zeeman-effect-induced spin filtering energy windows in a quantum wire

Xiao, Xunwen; Chen, Zhaoxia; Nie, Wenjie; Zhou, Guanghui; Li, Fēi

doi:10.1063/1.4882024

Cited by 7 publications

(5 citation statements)

References 45 publications

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“…2, or their interpretation is still ambiguous and far from being conclusive 35 . The same peculiar structure induced by SOI and Zeeman coupling has been shown to induce interesting spin filtering effects in hybrid junctions 31,36 .…”

Section: Introductionmentioning

confidence: 99%

Conductance behavior in nanowires with spin-orbit interaction: A numerical study

Rainis

Loss

2014

Phys. Rev. B

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We consider electronic transport through semiconducting nanowires (W) with spin-orbit interaction (SOI), in a hybrid N-W-N setup where the wire is contacted by normal-metal leads (N). We investigate the conductance behavior of the system as a function of gate and bias voltage, magnetic field, wire length, temperature, and disorder. The transport calculations are performed numerically and are based on standard recursive Green's function techniques. In particular, we are interested in understanding if and how it is possible to deduce the strength of the SOI from the transport behavior. This is a very relevant question since so far no clear experimental observation in that direction has been produced. We find that the smoothness of the electrostatic potential profile between the contacts and the wire plays a crucial role, and we show that in realistic regimes the N-W-N setup may mask the effects of SOI, and a trivial behavior with apparent vanishing SOI is observed. We identify an optimal parameter regime, with neither too smooth nor too abrupt potentials, where the signature of SOI is best visible, with and without Fabry-Pérot oscillations, and is most resilient to disorder and temperature effects.

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Section: Introductionmentioning

confidence: 99%

Conductance behavior in nanowires with spin-orbit interaction: A numerical study

Rainis

Loss

2014

Phys. Rev. B

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“…We employ the tight-binding approximation and the recursive scattering matrix method [87][88][89] to calculate the spinresolved transmission matrix 𝑡 σ ↑ and the spin polarization vector 𝑃 . In particular, we discretize the scattering region using a square lattice with the nearest hopping energy t 0 = h2 /2m * a 2 , where a is the side length of the unit cell.…”

Section: Resultsmentioning

confidence: 99%

Enhancing von Neumann entropy by chaos in spin–orbit entanglement*

Liu

Chen

et al. 2019

Chinese Phys. B

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For a quantum system with multiple degrees of freedom or subspaces, loss of coherence in a certain subspace is intimately related to the enhancement of entanglement between this subspace and another one. We investigate intra-particle entanglement in two-dimensional mesoscopic systems, where an electron has both spin and orbital degrees of freedom and the interaction between them is enabled by Rashba type of spin–orbit coupling. The geometric shape of the scattering region can be adjusted to produce a continuous spectrum of classical dynamics with different degree of chaos. Focusing on the spin degree of freedom in the weak spin–orbit coupling regime, we find that classical chaos can significantly enhance spin–orbit entanglement at the expense of spin coherence. Our finding that classical chaos can be beneficial to intra-particle entanglement may have potential applications such as enhancing the bandwidth of quantum communications.

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“…The ballistic transport properties of a quasi‐one‐dimensional (Q1D) electron system have recently been studied extensively in the presence of the RSOI, because only a few populated sub‐bands are allowed in the Q1D system. The 2DEG system has many propagating channels because the RSOI‐induced splitting is comparable to the energy sub‐band spacing.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous works examining the RSOI, RSOI has been introduced to the system various ways: using gate‐bias voltage, using spatially modulated RSOI, and using double finger gates or a periodic array of top gates . The ballistic transport through Q1D systems of semiconductors, metals, and other compound materials has also been studied with or without external magnetic fields in a variety of ways …”

Section: Introductionmentioning

confidence: 99%

The Gate‐Controlled Spin Transport of Electrons in a Quantum Wire: Effects of Different Geometry of Gates

Park

Kim

2019

Physica Status Solidi (b)

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The spin transport properties of electrons through a quasi-one-dimensional quantum wire are investigated. Different numbers of gates which induce the local Rashba-type spin-orbit interaction is considered. The total length of the gate-voltage applied domain is the same in each case, but it is divided into either two or three sections. The ballistic transmission probability as a function of the incident electron energy and the strength of the Rashba spinorbit interaction is calculated by using the quantum transmitting boundary method. In the double gate geometry, the effect of interactions between neighboring gates is studied. The results show a peculiar change in the transmission probability as a function of the incident electron's energy. The spin-up and spin-down transmission probabilities oscillate alternately as a function of the strength of the Rashba spin-orbit interaction. While the period of oscillation becomes shorter as the strength of the Rashba spinorbit interaction increases in a single gate system, the period of oscillation is not affected much by the strength of the Rashba spin-orbit interaction in the double or triple gate system.

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Rashba-Zeeman-effect-induced spin filtering energy windows in a quantum wire

Cited by 7 publications

References 45 publications

Conductance behavior in nanowires with spin-orbit interaction: A numerical study

Conductance behavior in nanowires with spin-orbit interaction: A numerical study

Enhancing von Neumann entropy by chaos in spin–orbit entanglement*

The Gate‐Controlled Spin Transport of Electrons in a Quantum Wire: Effects of Different Geometry of Gates

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