Effect of Disorder on the Quantum Coherence in Mesoscopic Wires

Niimi, Yasuhiro; Baines, Yannick; Capron, Thibaut; Mailly, D.; Lo, Fang Yuh; Wieck, A. D.; Meunier, Tristan; Saminadayar, Laurent; Bäuerle, Christopher

doi:10.1103/physrevlett.102.226801

Cited by 25 publications

(39 citation statements)

References 26 publications

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“…Many experiments have shown a dependence of τ 0 φ on the disorder in the system, characterized by D [52][53][54] . A dependence of D on W is detectable by a change in resistivity with W .…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

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

Rudolph

Heremans

2011

Phys. Rev. B

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“…Weak localization occurs in metallic systems and has been used to study decoherence of electrons [47][48][49][50] . The principle of this technique relies on constructive interference of closed electron trajectories which are traveled in opposite direction (time reversed paths).…”

Section: Weak Antilocalizationmentioning

confidence: 99%

Extrinsic spin Hall effects measured with lateral spin valve structures

et al. 2014

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The spin Hall effect (SHE), induced by spin-orbit interaction in nonmagnetic materials, is one of the promising phenomena for conversion between charge and spin currents in spintronic devices. The spin Hall (SH) angle is the characteristic parameter of this conversion. We have performed experiments of the conversion from spin into charge currents by the SHE in lateral spin valve structures. We present experimental results on the extrinsic SHEs induced by doping nonmagnetic metals, Cu or Ag, with impurities having a large spin-orbit coupling, Bi or Pb, as well as results on the intrinsic SHE of Au. The SH angle induced by Bi in Cu or Ag is negative and particularly large for Bi in Cu, 10 times larger than the intrinsic SH angle in Au. We also observed a large SH angle for CuPb but the SHE signal disappeared in a few days. Such an aging effect could be related to a fast mobility of Pb in Cu and has not been observed in CuBi alloys.

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“…Using an original ion implantation technique, as detailed in the next section, we can vary the diffusion coefficient D over 3 orders of magnitude without changing any other parameter, such as electron density, band structure, etc. In our previous work on the lowtemperature decoherence as a function of D, 24 we have presented mainly results for quasi-1D wires of a single width. Here we present an exhaustive report concerning the disorder dependence for quasi-1D wires as well as 2D Hall bars.…”

Section: Introductionmentioning

confidence: 99%

Quantum coherence at low temperatures in mesoscopic systems: Effect of disorder

et al. 2010

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We study the disorder dependence of the phase coherence time of quasi-one-dimensional wires and twodimensional ͑2D͒ Hall bars fabricated from a high mobility GaAs/AlGaAs heterostructure. Using an original ion implantation technique, we can tune the intrinsic disorder felt by the 2D electron gas and continuously vary the system from the semiballistic regime to the localized one. In the diffusive regime, the phase coherence time follows a power law as a function of diffusion coefficient as expected in the Fermi-liquid theory, without any sign of low-temperature saturation. Surprisingly, in the semiballistic regime, it becomes independent of the diffusion coefficient. In the strongly localized regime we find a diverging phase coherence time with decreasing temperature, however, with a smaller exponent compared to the weakly localized regime.

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Effect of Disorder on the Quantum Coherence in Mesoscopic Wires

Cited by 25 publications

References 26 publications

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

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

Extrinsic spin Hall effects measured with lateral spin valve structures

Quantum coherence at low temperatures in mesoscopic systems: Effect of disorder

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