Bistability and Displacement Fluctuations in a Quantum Nano-mechanical Oscillator
| Autor: | Rémi Avriller, B Murr, Fabio Pistolesi |
|---|---|
| Přispěvatelé: | Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Coupling constant Bistability Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Spectrum (functional analysis) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Omega Spectral line Quantum dot 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 010306 general physics 0210 nano-technology Quantum Energy (signal processing) [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall] |
| Zdroj: | Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2018, 97 (15), pp.155414 (1-13). ⟨10.1103/PhysRevB.97.155414⟩ |
| ISSN: | 1098-0121 1550-235X |
| Popis: | Remarkable features have been predicted for the mechanical fluctuations at the bistability transition of a classical oscillator coupled capacitively to a quantum dot [Micchi et al., Phys. Rev. Lett. 115, 206802 (2015)]. These results have been obtained in the regime $\ensuremath{\hbar}{\ensuremath{\omega}}_{0}\ensuremath{\ll}{k}_{B}T\ensuremath{\ll}\ensuremath{\hbar}\mathrm{\ensuremath{\Gamma}}$, where ${\ensuremath{\omega}}_{0}, T$, and $\mathrm{\ensuremath{\Gamma}}$ are the mechanical resonating frequency, the temperature, and the tunneling rate, respectively. A similar behavior could be expected in the quantum regime of $\ensuremath{\hbar}\mathrm{\ensuremath{\Gamma}}\ensuremath{\ll}{k}_{B}T\ensuremath{\ll}\ensuremath{\hbar}{\ensuremath{\omega}}_{0}$. We thus calculate the energy- and displacement-fluctuation spectra and study their behavior as a function of the electromechanical coupling constant when the system enters the Frank-Condon regime. We find that in analogy with the classical case, the energy-fluctuation spectrum and the displacement spectrum widths show a maximum for values of the coupling constant at which a mechanical bistability is established. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|