Conductance Anomaly in a Partially Open Adiabatic Quantum Point Contact
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913121018314752 |
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| author | Liu, Donghao Gutman, Dmitri |
| author_facet | Liu, Donghao Gutman, Dmitri |
| contents | We demonstrate that conductance anomalies can arise in a clean, adiabatic quantum point contact when a channel is partially transmitting. Even for a smooth barrier potential, backscattering induces Friedel oscillations that, via electron interactions, generate a singular correction to the conductance. This correction is maximized when the channel is half-open, resulting in a reduction of conductance. In addition, a magnetic field applied perpendicular to the spin-orbit axis modifies the single-particle spectrum, resulting in conductance oscillations via Fabry-Pérot-type interference, as well as a non-monotonic field dependence of the anomaly. Our findings reveal a universal mechanism by which interactions modify the conductance of an ideal partially open channel and offer a possible explanation for the anomalous features observed in experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_20678 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Conductance Anomaly in a Partially Open Adiabatic Quantum Point Contact Liu, Donghao Gutman, Dmitri Mesoscale and Nanoscale Physics We demonstrate that conductance anomalies can arise in a clean, adiabatic quantum point contact when a channel is partially transmitting. Even for a smooth barrier potential, backscattering induces Friedel oscillations that, via electron interactions, generate a singular correction to the conductance. This correction is maximized when the channel is half-open, resulting in a reduction of conductance. In addition, a magnetic field applied perpendicular to the spin-orbit axis modifies the single-particle spectrum, resulting in conductance oscillations via Fabry-Pérot-type interference, as well as a non-monotonic field dependence of the anomaly. Our findings reveal a universal mechanism by which interactions modify the conductance of an ideal partially open channel and offer a possible explanation for the anomalous features observed in experiments. |
| title | Conductance Anomaly in a Partially Open Adiabatic Quantum Point Contact |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2510.20678 |