Phononic heat transfer through a one dimensional system subject to two sources of nonequilibrium

Beraha, Natalia; Soba, Alejandro; Barreto, R.; Carusela, M. Florencia

doi:10.1016/j.physa.2015.03.024

Cited by 8 publications

(22 citation statements)

References 28 publications

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“…The transmission function shows that the system presents a multiresonant energy transport [8]. Therefore with a suitable modulation, the allowed phonon band can be changed or shifted and so the phonons involved in the transport.…”

Section: Resultsmentioning

confidence: 99%

“…Many models of heat pumps have been proposed based on different mechanisms such as heat ratchets that periodically adjusts two baths' temperatures while the average remains equal, brownian heat motors to shuttle heat across the system [6], heat pumps which directs heat against thermal bias in nanomechanical systems [7]. At molecular levels phonon pumps can also be induced by an external force or by mechanical switch on-off of the coupling between different parts of the system [8,9,10,11,12,13,14]. Experimentally the last can be done in molecular junctions or in molecular systems, for example, varying the distance among them or applying stretchings and compressions.…”

Section: Introductionmentioning

confidence: 99%

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Frequency thermal response and cooling performance in a microscopic system with a time-dependent perturbation

Beraha

Soba

Carusela

2016

Physica A: Statistical Mechanics and its Applications

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Following the nonequilibrium Green's function formalism we study the thermal transport in a composite chain subject to a time-dependent perturbation. The system is formed by two finite linear asymmetric harmonic chains subject to an on-site potential connected together by a time-modulated coupling. The ends of the chains are coupled to two phononic reservoirs at different temperatures. We present the relevant equations used to calculate the heat current along each segment. We find that the system presents different transport regimes according the driving frequency and temperature gradients. One of the regimes corresponds to a heat pump against thermal gradient, thus a characterization of the cooling performance of the device is presented. arXiv:1604.07714v1 [cond-mat.mes-hall]

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Frequency thermal response and cooling performance in a microscopic system with a time-dependent perturbation

Beraha

Soba

Carusela

2016

Physica A: Statistical Mechanics and its Applications

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“…Non-local interactions constitute the basis of a great variety of natural phenomena, at both macro and nanoscale levels, and heat transport is amongst them. Most of first principle studies on thermal transport in low dimensional systems, are based on classical and quantum models that consider local (first-neighbor) interactions [1,2,3,4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous works [1,2] we treated the phononic heat transport through classical and quantum 1D chains with first-neighbor interactions between atoms, when subjected to thermo-mechanical time-dependent perturbations. We found that it is possible to dynamically tune the presence of different transport regimes.…”

Section: Introductionmentioning

confidence: 99%

Heat transport and cooling performance in a nanomechanical system with local and non local interactions

Beraha,

Carusela,

Soba

2022

Preprint

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In the present work, we study heat transport through a one dimensional time-dependent nanomechanical system. The microscopic model consists of coupled chains of atoms, considering local and non-local interactions between particles. We show that the system presents different stationary transport regimes depending on the driving frequency, temperature gradients and the degree of locality of the interactions. In one of these regimes, the system operates as a phonon refrigerator, and its cooling performance is analyzed. Based on a low frequency approach, we show that non-locality and its interplay with dissipation cause a decrease in cooling capacity. The results are obtained numerically by means of the Keldysh non-equilibrium Green's function formalism.

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“…For many physical systems, a common basic problem is the response of a nonlinear medium to periodic excitations at the boundary or inside a local region in the bulk [1][2][3][4][5][6][7][8][9][10]. The energy can flow or not flow from the energy source into the medium, depending on the medium, the frequency, and the amplitude of the excitations.…”

Section: Introductionmentioning

confidence: 99%

Discrete breathers assist energy transfer to ac-driven nonlinear chains

et al. 2018

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A one-dimensional chain of pointwise particles harmonically coupled with nearest neighbors and placed in sixth-order polynomial on-site potentials is considered. The power of the energy source in the form of single ac driven particle is calculated numerically for different amplitudes A and frequencies ω within the linear phonon band. The results for the on-site potentials with hard and soft anharmonicity types are compared. For the hard-type anharmonicity, it is shown that when the driving frequency is close to (far from) the upper edge of the phonon band, the power of the energy source normalized to A^{2} increases (decreases) with increasing A. In contrast, for the soft-type anharmonicity, the normalized power of the energy source increases (decreases) with increasing A when the driving frequency is close to (far from) the lower edge of the phonon band. Our further demonstrations indicate that in the case of hard (soft) anharmonicity, the chain can support movable discrete breathers (DBs) with frequencies above (below) the phonon band. It is the energy source quasiperiodically emitting moving DBs in the regime with driving frequency close to the DB frequency that induces the increase of the power. Therefore, our results here support the mechanism that the moving DBs can assist energy transfer from the ac driven particle to the chain.

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Phononic heat transfer through a one dimensional system subject to two sources of nonequilibrium

Cited by 8 publications

References 28 publications

Frequency thermal response and cooling performance in a microscopic system with a time-dependent perturbation

Frequency thermal response and cooling performance in a microscopic system with a time-dependent perturbation

Heat transport and cooling performance in a nanomechanical system with local and non local interactions

Discrete breathers assist energy transfer to ac-driven nonlinear chains

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