Quantum Point Contacts in a Density-Tunable Two-Dimensional Electron Gas

Nuttinck, S.; Hashimoto, Katsufumi; Miyashita, S.; Saku, T.; Yamamoto, Yoshihisa; Hirayama, Y.

doi:10.1143/jjap.39.l655

Cited by 39 publications

(46 citation statements)

References 12 publications

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“…045346-3 resolved conductance curves coincide with results obtained from transmission across a saddle potential in the presence of a Gaussian spin splitting, 8 and with corresponding DFT results. 17 The curves in Fig.…”

Section: Effects Of Short-range Interactions On… Physical Review B 75supporting

confidence: 79%

Effects of short-range interactions on transport through quantum point contacts: A numerical approach

2007

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We study electronic transport through a quantum point contact, where the interaction between the electrons is approximated by a contact potential. Our numerical approach is based on the nonequilibrium Green-function technique which is evaluated at the Hartree-Fock level. We show that this approach allows us to reproduce relevant features of the so-called "0.7 anomaly" observed in the conductance at low temperatures, including the characteristic features in recent shot-noise measurements. This is consistent with a spin-splitting interpretation of the process, and indicates that the 0.7 anomaly should also be observable in transport experiments with ultracold fermionic atoms.

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Section: Effects Of Short-range Interactions On… Physical Review B 75supporting

confidence: 79%

Effects of short-range interactions on transport through quantum point contacts: A numerical approach

2007

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“…This can also survive to a few degrees, though is less robust than the 0.7 anomaly and is more readily suppressed by a magnetic field 2 . Recently the anomaly was confirmed also in back-gated 12 , in shallow-etched 13 point contacts and in a ballistic quantum wire 14 . At low temperatures the anomaly exhibits a puzzling similarity with Kondo resonance behavior 15 , as do thermopower measurements 16 .…”

Section: Introductionmentioning

confidence: 78%

Conductance anomalies and the extended Anderson model for nearly perfect quantum wires

2003

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Anomalies near the conductance threshold of nearly perfect semiconductor quantum wires are explained in terms of singlet and triplet resonances of conduction electrons with a single weaklybound electron in the wire. This is shown to be a universal effect for a wide range of situations in which the effective single-electron confinement is weak. The robustness of this generic behavior is investigated numerically for a wide range of shapes and sizes of cylindrical wires with a bulge. The dependence on gate voltage, source-drain voltage and magnetic field is discussed within the framework of an extended Hubbard model. This model is mapped onto an extended Anderson model, which in the limit of low temperatures is expected to lead to Kondo resonance physics and pronounced many-body effects.

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“…In spite of the long research history, it still remains a considerable interest in terms of many-body effect such as the 0.7 anomaly [3][4][5][6][7][8][9][10][11][12][13] . Thus, to precisely clarify the mesoscopic transport in QPC from various points of view is still of scientific significance.…”

Section: Introductionmentioning

confidence: 99%

Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts

et al. 2016

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We report a precise experimental study on the shot noise of a quantum point contact (QPC) fabricated in a GaAs/AlGaAs based high-mobility two-dimensional electron gas (2DEG). xThe combination of unprecedented cleanliness and very high measurement accuracy has enabled us to discuss the Fano factor to characterize the shot noise with a precision of 1 %. We observed that the shot noise at zero magnetic field exhibits a slight enhancement exceeding the single particle theoretical prediction, and that it gradually decreases as a perpendicular magnetic field is applied. We also confirmed that this additional noise completely vanishes in the quantum Hall regime. These phenomena can be explained by the electron heating effect near the QPC, which is suppressed with increasing magnetic field.

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Quantum Point Contacts in a Density-Tunable Two-Dimensional Electron Gas

Cited by 39 publications

References 12 publications

Effects of short-range interactions on transport through quantum point contacts: A numerical approach

Effects of short-range interactions on transport through quantum point contacts: A numerical approach

Conductance anomalies and the extended Anderson model for nearly perfect quantum wires

Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts

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