Quantum Turnstile Regime Of Nanoelectromechanical Systems
| Autor: | Bilal Tanatar, R. Dragomir, Valeriu Moldoveanu, Stefan G. Stanciu |
|---|---|
| Přispěvatelé: | Tanatar, Bilal |
| Rok vydání: | 2020 |
| Předmět: |
Mechanical equilibrium
FOS: Physical sciences 02 engineering and technology Electron Mesoscopics 01 natural sciences law.invention Turnstile law Quantum mechanics 0103 physical sciences Master equation Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 010306 general physics Computer Science::Data Structures and Algorithms Quantum Quantum tunnelling Nanomechanical devices Nanoelectromechanical systems Physics Mesoscopic physics Nanotubes Condensed Matter - Mesoscale and Nanoscale Physics 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Quantum transport 0210 nano-technology |
| Zdroj: | Physical Review B |
| Popis: | The effects of a turnstile operation on the current-induced vibron dynamics in nanoelectromechanical systems (NEMS) are analyzed in the framework of the generalized master equation. In our simulations each turnstile cycle allows the pumping of up to two interacting electrons across a biased mesoscopic subsystem which is electrostatically coupled to the vibrational mode of a nanoresonator. The time-dependent mean vibron number is very sensitive to the turnstile driving, rapidly increasing/decreasing along the charging/discharging sequences. This sequence of heating and cooling cycles experienced by the nanoresonator is due to specific vibron-assisted sequential tunneling processes along a turnstile period. At the end of each charging/discharging cycle the nanoresonator is described by a linear combination of vibron-dressed states ${s}_{\ensuremath{\nu}}$ associated to an electronic configuration $\ensuremath{\nu}$. If the turnstile operation leads to complete electronic depletion the nanoresonator returns to its equilibrium position, i.e., its displacement vanishes. It turns out that a suitable bias applied on the NEMS leads to a slow but complete cooling at the end of the turnstile cycle. Our calculations show that the quantum turnstile regime switches the dynamics of the NEMS between vibron-dressed subspaces with different electronic occupation numbers. We predict that the turnstile control of the electron-vibron interaction induces measurable changes on the input and output transient currents. |
| Databáze: | OpenAIRE |
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