Transient dynamics of an adiabatic NEMS

Biggio, M.; Cavaliere, Fabio; Storace, Marco; Sassetti, Maura

doi:10.1002/andp.201400140

Cited by 9 publications

(10 citation statements)

References 74 publications

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“…Our obtained experimental fit value = 0.11 on imaging DxO@mGO and MxD@mGO (Fig. 6a) matches well to a generalized theoretical estimate of damping coefficient of order 10 À1 that considers similar dynamics 53 ; attesting merit to our analysis.…”

Section: Resultssupporting

confidence: 83%

“…2). Basically, two markedly distinct regimes of energy interactions are possible (i) the anti-adiabatic case: when the cantilever dynamics does a fast transition between equilibrium states remaining oblivious to the intermediate metastable state 53 and (ii) the opposite adiabatic case: where the oscillator dynamics is very slow compared to the faster relaxation processes at the interface, thus susceptible to nonlinear damping effects 54 . A third crossover regime at a comparable timescale τ osc ffi τ sur has the fluctuational relevance as described above.…”

Section: Resultsmentioning

confidence: 99%

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Deconvolution of dissipative pathways for the interpretation of tapping-mode atomic force microscopy from phase-contrast

2021

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Phase-contrast in tapping-mode atomic force microscopy (TM-AFM) results from dynamic tip-surface interaction losses which allow soft and hard nanoscale features to be distinguished. So far, phase-contrast in TM-AFM has been interpreted using homogeneous Boltzmann-like loss distributions that ignore fluctuations. Here, we revisit the origin of phase-contrast in TM-AFM by considering the role of fluctuation-driven transitions and heterogeneous loss. At ultra-light tapping amplitudes <3 nm, a unique amplitude dependent two-stage distribution response is revealed, alluding to metastable viscous relaxations that originate from tapping-induced surface perturbations. The elastic and viscous coefficients are also quantitatively estimated from the resulting strain rate at the fixed tapping frequency. The transitional heterogeneous losses emerge as the dominant loss mechanism outweighing homogeneous losses at smaller amplitudes for a soft-material. Analogous fluctuation mediated phase-contrast is also apparent in contact resonance enhanced AFM-IR (infrared), showing promise in decoupling competing thermal loss mechanisms via radiative and non-radiative pathways. Understanding the loss pathways can provide insights on the bio-physical origins of heterogeneities in soft-bio-matter e.g., single cancer cell, tumors, and soft-tissues.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Deconvolution of dissipative pathways for the interpretation of tapping-mode atomic force microscopy from phase-contrast

2021

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“…We emphasize that the focus of the paper has been on the steady-state dynamics of the system in the realistic regime of weak to intermediate electron-vibration coupling. The issue of the transient dynamics, which has recently attracted the interest of many researchers [71][72][73][74][75], has not been addressed. Some work on the transient regime in the presence of a temperature difference between the leads is in progress.…”

Section: Resultsmentioning

confidence: 99%

Interplay between electron–electron and electron–vibration interactions on the thermoelectric properties of molecular junctions

2015

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The linear and non-linear thermoelectric properties of molecular junctions are theoretically studied close to room temperature within a model including electron-electron and electron-vibration interactions on the molecule. A non-equilibrium adiabatic approach is devised to include a strong Coulomb repulsion and applied to the self-consistent calculation of electron and phonon transport properties of massive molecules, such as fullerenes, within the Coulomb blockade regime. We show that the phonon thermal conductance is quite sensitive to strong electron-electron interactions within the intermediate electron-vibration coupling regime. Furthermore, the electron-vibration interaction enhances both phonon and electron thermal conductance, and it reduces not only the charge conductance, but also the thermopower. The effect of the strong electron-electron interactions provides a peculiar double-peak structure to the thermopower versus charge conductance curve. Finally, within the regime of weak to intermediate electron-vibration and vibration-lead phonon coupling, the peak values of the thermoelectric figure of merit are slightly less than unity, and the maximal efficiency of the junction can reach values slightly less than half of the Carnot limit for large temperature differences between the leads. Recently, the possibility of controlling materials at the nanoscale has been exploited to optimize the thermoelectric efficiency [4,6,7]. For example, a maximum ZT 2.4 ≃ has been observed at room temperature in Bi Te Sb Te 2 3 2 3 superlattice thermoelectric devices [8]. High values of ZT have been reported in quantum dot superlattices [9] and in semiconductor nanowires [10], where phonon confinement can lead to a lower phonon thermal conductance [11,12]. Actually, a significant reduction in lattice thermal conductivity is considered as the main route for having high ZT in low-dimensional materials [13]. The improvement of thermoelectric efficiency can also derive from the discreteness of energy levels in nanostructures resulting into a violation of the OPEN ACCESS

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“…In general, the phonon-induced renormalization of the density of states on the quantum dot and the phonon-induced renormalization of the dot-lead coupling are important. Distinct time-dependent characteristics have been related to polaron effects [421,422], tunneling switch and nonadiabaticity [423,424], nanomechanical oscillations [425,426], optical excitations [427][428][429], Kondo resonance [394,430,431], image-charge effect [432] and also in higher-order cumulants, waiting-time distributions, FCS and noise [133,391,392,433] (Fig. 12(c)).…”

Section: Electronic Transportmentioning

confidence: 99%

A many-body approach to transport in quantum systems: From the transient regime to the stationary state

Ridley,

Talarico,

Karlsson

et al. 2022

Preprint

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We review one of the most versatile theoretical approaches to the study of time-dependent correlated quantum transport in nano-systems: the non-equilibrium Green's function (NEGF) formalism. Within this formalism, one can treat, on the same footing, inter-particle interactions, external drives and/or perturbations, and coupling to baths with a (piece-wise) continuum set of degrees of freedom. After a historical overview on the theory of transport in quantum systems, we present a modern introduction of the NEGF approach to quantum transport. We discuss the inclusion of inter-particle interactions using diagrammatic techniques, and the use of the so-called embedding and inbedding techniques which take the bath couplings into account non-perturbatively. In various limits, such as the non-interacting limit and the steady-state limit, we then show how the NEGF formalism elegantly reduces to well-known formulae in quantum transport as special cases. We then discuss nonequilibrium transport in general, for both particle and energy currents. Under the presence of a time-dependent drive -encompassing pump-probe scenarios as well as driven quantum systems -we discuss the transient as well as asymptotic behavior, and also how to use NEGF to infer information on the out-of-equilibrium system.As illustrative examples, we consider model systems general enough to pave the way to realistic systems. These examples encompass one-and two-dimensional electronic systems, systems with electron-phonon couplings, topological superconductors, and optically responsive molecular junctions where electron-photon couplings are relevant.

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Transient dynamics of an adiabatic NEMS

Cited by 9 publications

References 74 publications

Deconvolution of dissipative pathways for the interpretation of tapping-mode atomic force microscopy from phase-contrast

Deconvolution of dissipative pathways for the interpretation of tapping-mode atomic force microscopy from phase-contrast

Interplay between electron–electron and electron–vibration interactions on the thermoelectric properties of molecular junctions

A many-body approach to transport in quantum systems: From the transient regime to the stationary state

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