Carbon nanotube sensor for vibrating molecules

Remaggi, Federico; Ziani, N. Traverso; Dolcetto, Giacomo; Cavaliere, Fabio; Sassetti, Maura

doi:10.1088/1367-2630/15/8/083016

Cited by 5 publications

(5 citation statements)

References 69 publications

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“…The oscillator is commonly fabricated through suspended nano‐beams or doubly‐clamped carbon nanotubes (CNTs) , whereas the quantum dot can be either nano‐fabricated in a semiconducting host or embedded in the nanotube itself. NEMS have attracted a considerable interest due to a wealth of possible applications, ranging from single‐molecule mass spectrometers to nanoscale gas sensors and biosensors .…”

Section: Introductionmentioning

confidence: 99%

“…The oscillator is commonly fabricated through suspended nano-beams [3,4] or doubly-clamped carbon nanotubes (CNTs) [5][6][7][8][9][10][11], whereas the quantum dot can be either nano-fabricated in a semiconducting host or embedded in the nanotube itself. NEMS have attracted a considerable interest due to a wealth of possible applications, ranging from single-molecule mass spectrometers [12,13] to nanoscale gas sensors [14,15] and biosensors [16]. Basically, two markedly different regimes are possible for NEMS, according to the ratio between the bare oscillator frequency Ω 0 and the average tunneling rate Γ 0 of electrons flowing through the quantum dot.…”

Section: Introductionmentioning

confidence: 99%

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Transient dynamics of an adiabatic NEMS

et al. 2014

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This paper is focused on the transient dynamics of an adiabatic nano-electromechanical system (NEMS), consisting of a nano-mechanical oscillator coupled to a quantum dot. By numerically solving the nonlinear stochastic differential equation governing the oscillator, the time evolution of the oscillator position, of the dot occupation number and of the current are studied. Different parameter settings are studied where the system exhibits bi-stable, tri-stable or mono-stable behavior on a finite-time horizon. It is shown that, after a typically long transient, the system under investigation exhibits no hysteretic behavior and that a unique steady state is reached, independently of the initial conditions. The transient dynamics is marked out by one or two well separated characteristic times, depending on the considered case (i.e., mono- or multi-stable). These times are evaluated for a dot on-resonance or off-resonance. It turns out that the characteristic time scales are long in comparison to the period of the uncoupled oscillator, particularly at low bias, suggesting that the predicted transient dynamics may be observed in state-of-the-art experimental setups

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient dynamics of an adiabatic NEMS

et al. 2014

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“…They ended up with a Franck–Condon master equation which naturally embodies the overlap between different vibrational components of the interacting wavefunctions. The role of these position‐dependent Franck‐Condon terms on the mass sensing and transport properties of suspended CNTs has been later pointed out in the theoretical calculations of Remaggi et al and Donarini et al We stress that the suspended CNTs are used both as a conducting system and as a nanoresonator driven by a microwave signal. Here the setup is very different as the quantum wire and the nanoresonator are separate systems.…”

Section: Introductionmentioning

confidence: 84%

Interaction and Size Effects in Open Nano‐Electromechanical Systems

Tanatar

Moldoveanu

Dragomir

et al. 2019

Physica Status Solidi (b)

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The time-dependent transport of a 2D quantum wire (QW) connected to source/drain leads and electrostatically coupled to a singly-clamped InAs cantilever is investigated. The latter is placed above the nanowire and acts as a nanoresonator (NR) in the quantum regime. The vibron dynamics and the transport properties of this nano-electromechanical system (NEMS) are described within a generalized master equation approach which is exact with respect to the electron-vibron coupling. A detailed description of the electron-vibron coupling by taking into account its dependence on the wavefunctions of the quantum nanowire is introduced. It is shown that the tunneling processes in the QW trigger periodic oscillations of the average vibron number even in the absence of a bias. The time-dependent filling of the vibronic states changes as the nanoresonator is swept along the quantum wire.

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“…[14][15][16][17][18][19][20] Recently, research at the nanoscale has focused not only on charge but also on heat transport [21][22][23][24] . In particular, thermopower and thermal conductances have been measured and theoretically calculated in molecular junctions [25][26][27][28][29] . The role of vibrational degrees of freedom and their coupling with electrons have a fundamental importance on heat transport and dissipation.…”

Section: Introductionmentioning

confidence: 99%

Charge and heat transport in soft nanosystems in the presence of time-dependent perturbations

Nocera

Perroni

Ramaglia

et al. 2016

Beilstein J. Nanotechnol.

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Summary Background: Soft nanosystems are electronic nanodevices, such as suspended carbon nanotubes or molecular junctions, whose transport properties are modulated by soft internal degrees of freedom, for example slow vibrational modes. Effects of the electron–vibration coupling on the charge and heat transport of soft nanoscopic systems are theoretically investigated in the presence of time-dependent perturbations, such as a forcing antenna or pumping terms between the leads and the nanosystem. A well-established approach valid for non-equilibrium adiabatic regimes is generalized to the case where external time-dependent perturbations are present. Then, a number of relevant applications of the method are reviewed for systems composed by a quantum dot (or molecule) described by a single electronic level coupled to a vibrational mode. Results: Before introducing time-dependent perturbations, the range of validity of the adiabatic approach is discussed showing that a very good agreement with the results of an exact quantum calculation is obtained in the limit of low level occupation. Then, we show that the interplay between the low frequency vibrational modes and the electronic degrees of freedom affects the thermoelectric properties within the linear response regime finding out that the phonon thermal conductance provides an important contribution to the figure of merit at room temperature. Our work has been stimulated by recent experimental results on carbon nanotube electromechanical devices working in the semiclassical regime (resonator frequencies in the megahertz range compared to an electronic hopping frequency of the order of tens of gigahertz) with extremely high quality factors. The nonlinear vibrational regime induced by the external antenna in such systems has been discussed within the non-perturbative adiabatic approach reproducing quantitatively the characteristic asymmetric shape of the current–frequency curves. Within the same set-up, we have proved that the antenna is able to pump sufficient charge close to the mechanical resonance making single-parameter adiabatic charge pumping feasible in carbon nanotube resonators. The pumping mechanism that we observe is different from that acting in the two parameter pumping and, instead, it is based on an important dynamic adjustment of the mechanical motion of the nanotube to the external drive in the weakly nonlinear regime. Finally, stochastic forces induced by quantum and thermal fluctuations due to the electron charging of the quantum dot are shown to affect in a significant way a Thouless charge pump realized with an elastically deformable quantum dot. In this case, the pumping mechanism is also shown to be magnified when the frequency of the external drive is resonant with the proper frequency of the deformable quantum dot. In this regime, the pumping current is not strongly reduced by the temperature, giving a measurable effect. Conclusion: Aim of this review has been to discuss common features of different soft nanosystems under external drive. The...

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Carbon nanotube sensor for vibrating molecules

Cited by 5 publications

References 69 publications

Transient dynamics of an adiabatic NEMS

Transient dynamics of an adiabatic NEMS

Interaction and Size Effects in Open Nano‐Electromechanical Systems

Charge and heat transport in soft nanosystems in the presence of time-dependent perturbations

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