Resonant Multi-Lead Point-Contact Tunneling
| dc.creator | Nayak, C. | |
| dc.creator | Fisher, Matthew P. A. | |
| dc.creator | Ludwig, A. W. W. | |
| dc.creator | Lin, H. -H. | |
| dc.date | 1997-10-29 | |
| dc.date.accessioned | 2026-07-07T03:09:21Z | |
| dc.date.available | 2026-07-07T03:09:21Z | |
| dc.description | We analyze a model of resonant point-contact tunneling between multiple Luttinger liquid leads. The model is a variant of the multi-channel Kondo model and can be related to the quantum Brownian motion of a particle on lattices with $π$-flux through each plaquette (in the 3-lead case, it is a honeycomb lattice with $π$-flux). By comparing the perturbative and instanton gas expansions, we find a duality property of the model. At the boundary, this duality exchanges Neumann and Dirichlet boundary conditions on the Tomonaga-Luttinger bosons which describe the leads; in the bulk, it exchanges the `momentum' and `winding' modes of these bosons. Over a certain range of Luttinger liquid parameter, $g$, a novel non-trivial intermediate coupling fixed point controls the low-energy physics. The finite conductance at this fixed point can be exactly computed for two special values of $g$. For larger values of $g$, there is a stable fixed point at strong coupling which has enhanced conductance resulting from an analogue of Andreev reflection at the point contact. | |
| dc.description | 18 pages, LaTeX, 5 figures, psfig | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9710305 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9710305 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/27850 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Resonant Multi-Lead Point-Contact Tunneling | |
| dc.type | text |