Probing spin-charge separation in tunnel-coupled parallel quantum wires

Zülicke, U.; Governale, Michele

doi:10.1103/physrevb.65.205304

Cited by 23 publications

(4 citation statements)

References 26 publications

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“…19 It was shown theoretically that by making use of quantum wire structures the performance of spin transistor structures with respect output modulation can be improved and devices with new functionalities, e.g., spin filters, can be realized. [19][20][21][22] Experimentally the presence of spin-orbit coupling can be verified by the observance of the weak antilocalization effect. 23,24 For one-dimensional structures the spin-orbit scattering length l so being a measure of the strength of spin-orbit coupling can be determined by fitting an appropriate theoretical model.…”

Section: Introductionmentioning

confidence: 87%

Spin-orbit coupling and phase coherence in InAs nanowires

et al. 2010

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We investigated the magnetotransport of InAs nanowires grown by selective-area metal-organic vapor phase epitaxy. In the temperature range between 0.5 and 30 K reproducible fluctuations in the conductance upon variation in the magnetic field or the backgate voltage are observed, which are attributed to electron interference effects in small disordered conductors. From the correlation field of the magnetoconductance fluctuations the phase-coherence length l is determined. At the lowest temperatures l is found to be at least 300 nm while for temperatures exceeding 2 K a monotonous decrease in l with temperature is observed. A direct observation of the weak antilocalization effect indicating the presence of spin-orbit coupling is masked by the strong magnetoconductance fluctuations. However, by averaging the magnetoconductance over a range of gate voltages a clear peak in the magnetoconductance due to the weak antilocalization effect was resolved. By comparison of the experimental data to simulations based on a recursive two-dimensional Green's-function approach a spin-orbit scattering length of approximately 70 nm was extracted, indicating the presence of strong spin-orbit coupling.

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Section: Introductionmentioning

confidence: 87%

Spin-orbit coupling and phase coherence in InAs nanowires

et al. 2010

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“…16 Meanwhile, research activities have been extended to planar quasi-one-dimensional structures, which promise superior spin control. [17][18][19] The energy spectrum and spin precession in these structures are governed by the interplay between confinement and energy splitting due to spin-orbit coupling. 20,21 Only a few theoretical investigations have dealt with the effect of spin-orbit coupling in cylindrical conductors on electronic states and on quantum transport.…”

Section: Introductionmentioning

confidence: 99%

Spin precession and modulation in ballistic cylindrical nanowires due to the Rashba effect

Bringer

Schäpers

2011

Phys. Rev. B

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The spin precession in a cylindrical semiconductor nanowire due to Rashba spin-orbit coupling has been investigated theoretically using an InAs nanowire containing a surface two-dimensional electron gas as a model. The eigenstates, energy-momentum dispersion, and the energy-magnetic field dispersion relation are determined by solving the Schrödinger equation in a cylindrical symmetry. The combination of states with the same total angular momentum but opposite spin orientation results in a periodic modulation of the axial spin component along the axis of the wire. Spin-precession about the wires axis is achieved by interference of two states with different total angular momentum. Because a superposition state with exact opposite spin precession exists at zero magnetic field, an oscillation of the spin orientation can be obtained. If an axially oriented magnetic field is applied, the spin gains an additional precessing component.

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“…One can make use of the special features in the dispersion relation to design novel spin electronic devices, with new functionalities, e.g. spin interference devices [43] or spin filters [44][45][46][47]. Experimentally, the spin-orbit coupling in wire structures was investigated by analyzing the characteristic beating pattern in the Shubnikov-de Haas oscillations [48][49][50][51] or by studying the weak antilocalization effect [52].…”

Section: Introductionmentioning

confidence: 99%

Spin–orbit coupling in Ga_xIn_1−xAs/InP two-dimensional electron gases and quantum wire structures

Schäpers¹,

Guzenko²,

Bringer³

et al. 2009

Semicond. Sci. Technol.

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In this work, the effect of spin-orbit coupling in two-dimensional electron gases and quantum wire structures is discussed. First, the theoretical framework is introduced including spin-orbit coupling due to structural inversion asymmetry, the so-called Rashba effect, as well as the Dresselhaus term. The latter originates from bulk inversion asymmetry. With regard to wire structures, special attention is devoted to the influence of the particular shape of the confinement potential on the energy spectrum. As a model system Ga x In 1−x As/InP heterostructures are chosen, where different thicknesses of the strained Ga 0.23 In 0.77 As channel layer were introduced, in order to adjust the strength of the spin-orbit coupling. Hall bar structures as well as sets of identical wires with different widths were prepared. In two-dimensional electron gases, the strength of the spin-orbit coupling was extracted by analyzing the characteristic beating pattern in the Shubnikov-de Haas oscillations. In addition, the weak antilocalization was utilized to obtain information on the spin-orbit coupling. It is shown that for decreasing width of the strained layer the Rashba effect, which dominates in our layer systems, is increased. This behavior is attributed to the larger interface contribution if the electron wavefunction is strongly confined. The measurements on the wire structures revealed a transition from weak antilocalization to weak localization if the wire width is decreased. This effect is attributed to an enhanced spin diffusion length for strongly confined systems.

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Probing spin-charge separation in tunnel-coupled parallel quantum wires

Cited by 23 publications

References 26 publications

Spin-orbit coupling and phase coherence in InAs nanowires

Spin-orbit coupling and phase coherence in InAs nanowires

Spin precession and modulation in ballistic cylindrical nanowires due to the Rashba effect

Spin–orbit coupling in Ga_xIn_1−xAs/InP two-dimensional electron gases and quantum wire structures

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Probing spin-charge separation in tunnel-coupled parallel quantum wires

Cited by 23 publications

References 26 publications

Spin-orbit coupling and phase coherence in InAs nanowires

Spin-orbit coupling and phase coherence in InAs nanowires

Spin precession and modulation in ballistic cylindrical nanowires due to the Rashba effect

Spin–orbit coupling in GaxIn1−xAs/InP two-dimensional electron gases and quantum wire structures

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Spin–orbit coupling in Ga_xIn_1−xAs/InP two-dimensional electron gases and quantum wire structures