Enhanced spin-orbit scattering length in narrow<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Al</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Ga</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi mathvariant="normal">N</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Ga</mml:mi><mml:mi mathvariant="normal">N</mml:mi></mml:mrow></mml:math>wires

Lehnen, Patrick; Schäpers, Thomas; Kaluza, N.; Thillosen, N.; Hardtdegen, H.

doi:10.1103/physrevb.76.205307

Cited by 35 publications

(46 citation statements)

References 41 publications

(49 reference statements)

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“…These predictions are supported by experiments performed on narrow wires fabricated from InGaAs ͑Ref. 6-8͒ and AlGaN/GaN 2DESs, 9 which have observed increasing spin coherence times S as a function of reduced wire width w. For systems in the motional narrowing regime-for which a spin precesses only over a small angle between momentum scattering events-the spin coherence length L S is expected to be inversely proportional to w.…”

Section: Introductionsupporting

confidence: 56%

“…Thus quantitative information about both L S and L can be obtained from magnetotransport measurements. 5,[10][11][12][13][14][15][16][17][18][19][20][21][22][23] Extensive experimental and theoretical research on antilocalization phenomena in thin films of metals [11][12][13] and semiconductors, [23][24][25] in 2DESs, [14][15][16][17][18][19][20][26][27][28][29][30][31][32] in hole systems, 22,33 and in narrow wires [7][8][9][34][35][36] demonstrate that these measurements form a valuable experimental tool for investigating spin and phase coherence in various material systems.…”

Section: Introductionmentioning

confidence: 99%

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Spin and phase coherence lengths inn-InSbquasi-one-dimensional wires

et al. 2010

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We present measurements of the magnetoconductance of quasi-one-dimensional wires fabricated on a twodimensional electron system in an InSb/InAlSb heterostructure. The width and temperature dependence of the spin and phase coherence lengths in the narrow wires are examined by analyzing the magnetoconductance in antilocalization theory, modified to account for ballistic transport. The experiments indicate that the confined geometry can enhance spin coherence lengths in systems not in the motional narrowing regime and in the presence of strong cubic Dresselhaus spin-orbit interaction. Experimentally, the spin coherence lengths are found to be inversely proportional to wire width and to display a weak temperature dependence. For all wire widths the phase coherence length, after correction for finite length effects, shows a temperature dependence indicative of phase decoherence via the one-dimensional Nyquist mechanism.

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Spin and phase coherence lengths inn-InSbquasi-one-dimensional wires

et al. 2010

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“…Further, τ so increases as W decreases. In semiconductor 2DESs, where the SOI is dominated by inversion asymmetry via the structural Rashba and Dresselhaus terms, experiments and theory have verified 20,[24][25][26][27][28][29] that τ so ∝ W −1/2 . A similar dependence has not been proposed in the 3-dimensional bulk for SOI in heavy metallic elements like Bi.…”

Section: Resultsmentioning

confidence: 99%

“…For structural SOI, theory predicts that in quasi-one-dimensional (Q1D) wires, τ so increases with decreasing wire width 24,25 , indeed experimentally supported for various 2DESs 20,[26][27][28][29] . As yet, no similar theoretical predictions exist for SOI due to heavy elements, present in bulk Bi.…”

mentioning

confidence: 99%

Spin-orbit interaction and phase coherence in lithographically defined bismuth wires

Rudolph

Heremans

2011

Phys. Rev. B

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We present low temperature magnetoresistance measurements on lithographically defined bismuth wires. The phase coherence time and the spin-orbit scattering time are obtained by analysis of weak-antilocalization, with values for the phase coherence time supported by analysis of the universal conductance fluctuations present in the wires. We find that the phase coherence time is dominated by electron-phonon scattering above ≈ 2 K and saturates below that temperature, with saturation delayed to a lower temperature in wider wires. The spin-orbit scattering time shows a weak temperature dependence above 2 K, and also shows a dependence on wire width. The spinorbit scattering time increases as the width is reduced, as also observed in wires fabricated from spin-orbit coupled two-dimensional systems in semiconductor heterostructures. The similarity is discussed in the light of weak-antilocalization in the two-dimensional strongly spin-orbit coupled Bi(001) surface states.

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“…We suggest that these anomalous BSR dips can be measured in systems with strong SO coupling [31,32], such as an InAs quantum well.…”

Section: Discussionmentioning

confidence: 99%

Ballistic spin resonance in multisubband quantum wires

2014

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Ballistic spin resonance was experimentally observed in a quasi-one-dimensional wire by Frolov et al. [Nature (London) 458, 868 (2009)]. The spin resonance was generated by a combination of an external static magnetic field and the oscillating effective spin-orbit magnetic field due to periodic bouncings of the electrons off the boundaries of a narrow channel. An increase of the D'yakonov-Perel spin relaxation rate was observed when the frequency of the spin-orbit field matched that of the Larmor precession frequency around the external magnetic field. Here we develop a model to account for the D'yakonov-Perel mechanism in multisubband quantum wires with both the Rashba and Dresselhaus spin-orbit interactions. Considering elastic spin-conserving impurity scatterings in the time-evolution operator (Heisenberg representation), we extract the spin relaxation time by evaluating the time-dependent expectation value of the spin operators. The magnetic field dependence of the nonlocal voltage, which is related to the spin relaxation time behavior, shows a wide plateau, in agreement with the experimental observation. This plateau arises due to injection in higher subbands and small-angle scattering. In this quantum mechanical approach, the spin resonance occurs near the spin-orbit-induced energy anticrossings of the quantum wire subbands with opposite spins. We also predict anomalous dips in the spin relaxation time as a function of the magnetic field in systems with strong spin-orbit couplings.

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Enhanced spin-orbit scattering length in narrowAlxGa1−xN∕GaNwires

Cited by 35 publications

References 41 publications

Spin and phase coherence lengths inn-InSbquasi-one-dimensional wires

Spin and phase coherence lengths inn-InSbquasi-one-dimensional wires

Spin-orbit interaction and phase coherence in lithographically defined bismuth wires

Ballistic spin resonance in multisubband quantum wires

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