Proposal for a single-molecule field-effect transistor for phonons

We analyze a simple microscopic model to pump heat from a cold to a hot reservoir in a nanomechanical system. The model consists of a one-dimensional chain of masses and springs coupled to a back gate through which a time-dependent perturbation is applied. The action of the gate creates a moving phononic barrier by locally pinning a mass. We solve the problem numerically using a nonequilibrium Green function technique. For low driving frequencies and for sharp traveling barriers, we show that this microscopic model realizes a phonon refrigerator.

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“…The dashed lines are obtained from Eq. (17). The geometrical factor C is used as a fitting parameter to adjust Eq.…”

Section: Phononic Refrigeration a Mechanism And Minimum Coolingmentioning

confidence: 99%

Microscopic model of a phononic refrigerator

et al. 2012

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“…26, the required electric field for tuning torsion phonons is about 10MV/cm in the proposed high ionic polymers, which is a typical field for nanoscale field effect devices. Comparing with stretching-nanowire model, [19] our present model possesses some distinct features.…”

Section: Numerical Simulations Based On Molecular Dynamicsmentioning

confidence: 99%

“…Particles A and B are arranged in such a way that particle A and a cluster of n particles B…B are randomly assigned, known as RN model. [27] In contrast, the central segment is a single monomer periodic chain composed of highly polar particles C. [26] When an electric field is applied to the composite polymer, the coupling between the field and the polar particles C breaks the full rotational symmetry of the chain, thus transforming the phononic torsion branch from acoustic one to optical one. As a result, the transport of the torsion-mode phonons through the whole chain is changed due to its transformed phononic band.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…(2) becomes non-null and depends on the applied electric field. It is obvious that this composite polymer can be considered as one-dimensional harmonic oscillators, and the dispersion relation of torsion-mode phonons can be described as [26] 2 (1 cos )…”

Section: Theoretical Modelmentioning

confidence: 99%

“…[23,24] Although bulk polyethylene is a thermal insulator, the thermal conductivity of single polymer chain can be very high. [25] Very recently, Menezes et al [26] have demonstrated the coupling between high ionic polymers and electric field, and proposed a single-molecule field-effect transistor for phonons. Motivated by the fact that external electric field can influence the lattice vibration in ionic polymers, in this paper we propose a composite polymer to achieve an electric-field-dependent multimode quantized thermal conductance.…”

Section: Introductionmentioning

confidence: 99%

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Multimode quantized thermal conductance tuned by electric field in a composite polymer

Peng

Cao

et al. 2012

Phys. Rev. B

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In this article, we demonstrate theoretically that an electric-field-dependent multimode quantized thermal conductance can be achieved in a composite polymer in the frame of ballistic phonon transport. The composite polymer consists of three segments, where an ionic polymer is introduced as its central part and the non-polar polymers are designed on the left and the right parts, respectively. By increasing the applied electric field, the dispersion relation of phononic torsion mode is tuned, hence multiple phononic channels are adjusted one by one in the composite polymer. As a result, multiple-step quantized thermal conductance can be manipulated by external electric field. The analysis based on Landauer formula is in good agreement with both the numerical calculations with transfer-matrix method and the molecular dynamics simulations. By designing such three-segment composite polymer, multi-mode quantized thermal conductance tuned by external electric field becomes an exact analog to multi-step quantized electrical conductance tuned by 2 external magnetic field in the quantum Hall effect. The investigations may have potential applications in thermal manipulation and information transfer in mesoscopic phonon systems.

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Thermal and Thermoelectric Properties of Molecular Junctions

Wang

Meyhöfer

Reddy

2019

Adv Funct Materials

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Molecular junctions (MJs) represent an ideal platform for studying charge and energy transport at the atomic and molecular scale and are of fundamental interest for the development of molecular‐scale electronics. While tremendous efforts have been devoted to probing charge transport in MJs during the past two decades, only recently advances in experimental techniques and computational tools have made it possible to precisely characterize how heat is transported, dissipated, and converted in MJs. This progress is central to the design of thermally robust molecular circuits and high‐efficiency energy conversion devices. In addition, thermal and thermoelectric studies on MJs offer unique opportunities to test the validity of classical physical laws at the nanoscale. A brief survey of recent progress and emerging experimental approaches in probing thermal and thermoelectric transport in MJs is provided, including thermal conduction, heat dissipation, and thermoelectric effects, from both a theoretical and experimental perspective. Future directions and outstanding challenges in the field are also discussed.

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Proposal for a single-molecule field-effect transistor for phonons

Cited by 14 publications

References 20 publications

Microscopic model of a phononic refrigerator

Microscopic model of a phononic refrigerator

Multimode quantized thermal conductance tuned by electric field in a composite polymer

Thermal and Thermoelectric Properties of Molecular Junctions

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