Non-Kondo zero-bias anomaly in quantum wires

Chen, Tse-Ming; Graham, A. C.; Pepper, M.; Farrer, I.; Ritchie, D. A.

doi:10.1103/physrevb.79.153303

Cited by 26 publications

(49 citation statements)

References 28 publications

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“…[40][41][42][43] Another phenomenon that has been recently actively discussed in the literature is the ZBA in the I -V characteristics of quantum point contacts (QPC). [44][45][46] The ZBA in QPC experiments has very similar characteristics compared to the ones reported in this work, for example, in Ref. 46 the ZBA has a width of ≈100 μeV and has a similar temperature dependence vanishing above 1 K. Therefore, the results reported in this work may provide additional insights into the origin of these separate, but perhaps related, phenomena.…”

Section: Nonlinear Transport Measurements In a Gaas/algaas Heterosupporting

confidence: 79%

Nonlinear magnetotransport phenomena in high-mobility two-dimensional electrons in InGaAs/InP and GaAs/AlGaAs

et al. 2012

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This paper reports on the observation and analysis of magnetotransport phenomena in the nonlinear differential resistance r xx = dV xx /dI of high-mobility In x Ga 1−x As/InP and GaAs/Al x Ga 1−x As Hall bar samples driven by direct current I dc . Specifically, it is observed that Shubnikov-de Haas (SdH) oscillations at large filling factors invert their phase at sufficiently large values of I dc . This phase inversion is explained as being due to an electron heating effect. In the quantum Hall effect regime the r xx oscillations transform into diamond-shaped patterns with different slopes corresponding to odd and even filling factors. The diamond-shaped features at odd filling factors can be used as a probe to determine spin energy gaps. A zero current anomaly (ZCA) which manifests itself as a narrow dip in the r xx (I dc ) characteristics at zero current is also observed. The ZCA effect strongly depends upon temperature, vanishing above 1 K while the transport diamonds persist to higher temperatures. The transport diamonds and ZCA are fully reproduced in a higher mobility GaAs/AlGaAs Hall bar structure confirming that these phenomena reflect intrinsic properties of two-dimensional systems.

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Section: Nonlinear Transport Measurements In a Gaas/algaas Heterosupporting

confidence: 79%

Nonlinear magnetotransport phenomena in high-mobility two-dimensional electrons in InGaAs/InP and GaAs/AlGaAs

et al. 2012

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“…21 External bias is usually assumed to drop linearly across the QPC, so the bottom of subband stays fixed with respect to the center of bias window. 18,23 At low conductance, however, the linearity of the potential drop is modified by electron-electron interactions.…”

Section: 30mentioning

confidence: 99%

Zero-bias anomaly of quantum point contacts in the low-conductance limit

Ren

Frolov

et al. 2010

Phys. Rev. B

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Most quantum point contacts (QPCs) fabricated in high-mobility 2D electron gases show a zerobias conductance peak near pinchoff, but the origin of this peak remains a mystery. Previous experiments have primarily focused on the zero-bias peak at moderate conductance, in the range 1 − 2e 2 /h. Here, measurements are presented of zero-bias peaks that persist down to 10 −4 e 2 /h. Magnetic field and temperature dependencies of the zero-bias peak in the low-conductance limit are qualitatively different from the analogous phenomenology at higher conductance, with implications for existing theoretical models of transport in low-density QPCs.

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“…For molecules such as fullerenes that do not provide an unpaired spin in their ground state, it thus remains open, which spin would be responsible for the Kondo effect. It has also been pointed out recently that not all ZBAs which at the first glimpse resemble Kondo resonances are indeed caused by the Kondo effect, since they do not fulfill all predictions of the Kondo effect theories [24]. In particular in the situation when the off-resonance conductance outside the energy range of the ZBA is relatively high or 0 0.1 G G alternative interpretations have to be considered [16].…”

Section: Introductionmentioning

confidence: 99%

Switchable zero-bias anomaly in individual C60 molecules contacted with tunable aluminum electrodes

Scheer

Böhler

Edtbauer

et al. 2013

Low Temperature Physics

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We report the observation of strong resonances at zero bias in the differential conductance through Al-C 60 -Al junctions with tunable electrode distance, measured above T = 10 K. The conductance value at resonance ranges from a few percent up to eighty percent of the quantum of conductance. The resonances may disappear or reoccur completely and discontinuously upon very small changes of the electrode distance. However, once they are formed they are very robust with respect to changes of the electrode distance. We discuss similarities and differences to the common theories of the Kondo screening of a spontaneous spin polarization of the C 60 molecule. We deduce Kondo temperatures in the range from 35 to 160 K and demonstrate that the temperature dependence is in agreement with the scaling behavior of the Kondo effect in the temperature range of our experiment.

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Non-Kondo zero-bias anomaly in quantum wires

Cited by 26 publications

References 28 publications

Nonlinear magnetotransport phenomena in high-mobility two-dimensional electrons in InGaAs/InP and GaAs/AlGaAs

Nonlinear magnetotransport phenomena in high-mobility two-dimensional electrons in InGaAs/InP and GaAs/AlGaAs

Zero-bias anomaly of quantum point contacts in the low-conductance limit

Switchable zero-bias anomaly in individual C60 molecules contacted with tunable aluminum electrodes

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