Anti-Resonance and the 0.7 Anomaly in Conductance through a Quantum Point Contact
| dc.creator | Xiong, Ye | |
| dc.creator | Xie, X. C. | |
| dc.creator | Xiong, Shi-jie | |
| dc.date | 2004-03-03 | |
| dc.date.accessioned | 2026-07-07T02:56:46Z | |
| dc.date.available | 2026-07-07T02:56:46Z | |
| dc.description | We investigate the transmission of electrons through a quantum point contact by using a quasi-one-dimensional model with a local bound state below the band bottom. While the complete transmission in lower channels gives rise to plateaus of conductance at multiples of $2e^{2}/h$, the electrons in the lowest channel are scattered by the local bound state when it is singly occupied. This scattering produces a wide zero-transmittance (anti-resonance) for a singlet formed by tunneling and local electrons, and has no effect on triplets, leading to an exact $0.75(2e^{2}/h)$ shoulder prior to the first $2e^{2}/h$ plateau. Formation of a Kondo singlet from electrons in the Fermi sea screens the local moment and reduces the effects of anti-resonance, complementing the shoulder from 0.75 to 1 at low temperatures. | |
| dc.description | 4 pages, 3 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0403129 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0403129 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/23458 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Anti-Resonance and the 0.7 Anomaly in Conductance through a Quantum Point Contact | |
| dc.type | text |