Current oscillations in a metallic ring threaded by a time-dependent magnetic flux
We study a mesoscopic metallic ring threaded by a magnetic flux which varies linearly in time (formula presented) with a formalism based in Baym-Kadanoff-Keldysh nonequilibrium Green functions. We propose a method to calculate the Green functions in real space and we consider an experimental setup t...
| Publicado: |
2002
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v66_n4_p1_Arrachea http://hdl.handle.net/20.500.12110/paper_10980121_v66_n4_p1_Arrachea |
| Aporte de: |
| Sumario: | We study a mesoscopic metallic ring threaded by a magnetic flux which varies linearly in time (formula presented) with a formalism based in Baym-Kadanoff-Keldysh nonequilibrium Green functions. We propose a method to calculate the Green functions in real space and we consider an experimental setup to investigate the dynamics of the ring by recourse to a transport experiment. This consists of a single lead connecting the ring to a particle reservoir. We show that different dynamical regimes are attained depending on the ratio (formula presented) with (formula presented) and W the bandwidth of the ring. For moderate lengths of the ring, a stationary regime is achieved for (formula presented) In the opposite case with (formula presented) the effect of Bloch oscillations driven by the induced electric field manifests itself in the transport properties of the system. In particular, we show that in this time-dependent regime a tunneling current oscillating in time with a period (formula presented) can be measured in the lead. We also analyze the resistive effect introduced by inelastic scattering due to the coupling to the external reservoir. © 2002 The American Physical Society. |
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