Lattice dynamics of a disordered solid-solid interface

Fagas, Giorgos; Kozorezov, A. G.; Lambert, Colin J.; Wigmore, J. K.; Peacock, A.; Poelaert, A.; Hartog, R. den

doi:10.1103/physrevb.60.6459

Cited by 50 publications

(36 citation statements)

References 10 publications

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“…We therefore expect that our conclusions regarding the inelastic effects remain valid also for more complicated pair potentials. The face-centered-cubic lattice has been used as the lattice model in numerous earlier works investigating the effects of various material parameters on interfacial transport, including lattice constant [26] and mass [27] mismatch, the strength of interfacial bonding [10], low-dimensional contacts [28], interface roughness [29][30][31][32], and phonon-mediating thin films [33].…”

Section: A Structurementioning

confidence: 99%

Role of anharmonic phonon scattering in the spectrally decomposed thermal conductance at planar interfaces

et al. 2014

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A detailed understanding of the vibrational heat transfer mechanisms between solids is essential for the efficient thermal engineering and control of nanomaterials. We investigate the frequency dependence of anharmonic scattering and interfacial thermal conduction between two acoustically mismatched solids in planar contact by calculating the spectral decomposition of the heat current flowing through an interface between two materials. The calculations are based on analyzing the correlations of atomic vibrations using the data extracted from nonequilibrium molecular dynamics simulations. Inelastic effects arising from anharmonic interactions are shown to significantly facilitate heat transfer between two mass-mismatched face-centered-cubic lattices even at frequencies exceeding the cutoff frequency of the heavier material due to (i) enhanced dissipation of evanescent vibrational modes and (ii) frequency-doubling and frequency-halving three-phonon energy transfer processes at the interface. The results provide substantial insight into interfacial energy transfer mechanisms, especially at high temperatures, where inelastic effects become important and other computational methods are ineffective.

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Section: A Structurementioning

confidence: 99%

Role of anharmonic phonon scattering in the spectrally decomposed thermal conductance at planar interfaces

et al. 2014

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“…This approach is not valid for lower energy subgap phonons as their loss rate may be very slow and the temporal response may become dispersive. 13,27,28 In addition, their significant accumulation changes the rates of detrapping through the term I detrap ͕f trap ͖. However, for the moment, we will ignore this group of phonons but will discuss their possible role in the later consideration of real structures and experimental situations.…”

Section: Kinetic Description Of Nonequilibrium Quasiparticles Andmentioning

confidence: 99%

Dynamics of nonequilibrium quasiparticles in narrow-gap superconducting tunnel junctions

et al. 2008

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The latest generation of high quality, narrow gap, superconducting tunnel junctions ͑STJs͒ exhibits a steadystate and time-dependent behavior which cannot be described satisfactorily by previous treatments of nonequilibrium quasiparticle ͑qp͒ dynamics. These effects are particularly evident in experiments using STJs as detectors of photons, over the range from near infrared to x ray. In this paper, we present a detailed theoretical analysis of the spectral and temporal evolution of the nonequilibrium qp and phonon distributions in such STJs excited by single photons, over a wide range of excitation energy, bias voltage, and temperature. By solving the coupled set of kinetic equations describing the interacting excitations, we show that the nonequilibrium qp distribution created by the initial photoabsorption does not decay directly back to the initial undisturbed state in thermal equilibrium. Instead, it undergoes a rapid adiabatic relaxation to a long-lived, excited state, the spectral distribution of which is nonthermal, maintained by a balance between qp creation, recombination, and trapping. The model is able to describe successfully photoabsorption data taken on several different aluminum STJs, using a single set of parameters. Of particular note is the conclusion that the local traps responsible for qp loss are situated specifically in the region of Nb contacts.

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“…For the numerical calculation of the central quantity, T (E), we use a general scattering technique which has been recently formulated for studies of the giant magnetoresistance [20]. Application of the method to phonon transport across disordered interfaces [21] and to electric conductance in multi-wall carbon nanotubes [20] reveals an efficient algorithm for calculating the Green function for arbitrary tight-binding Hamiltonians and, hence, the S-matrix [19]. The computational scheme comprises two essential steps: first, the calculation of an effective (renormalized) interaction between the electrodes by projecting out the degrees of freedom of the scatterer, and second, the computation of the unperturbed electrodes Green function.…”

Section: ) Readsmentioning

confidence: 99%

Electron transport in nanotube–molecular-wire hybrids

2001

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We study contact effects on electron transport across a molecular wire sandwiched between two semi-infinite (carbon) nanotube leads as a model for nanoelectrodes. Employing the Landauer scattering matrix approach we find that the conductance is very sensitive to parameters such as the coupling strength and geometry of the contact. The conductance exhibits markedly different behavior in the two limiting scenarios of single contact and multiple contacts between the molecular wire and the nanotube interfacial atoms. In contrast to a single contact the multiple-contact configuration acts as a filter selecting single transport channels. It exhibits a scaling law for the conductance as a function of coupling strength and tube diameter. We also observe an unusual narrow-to-broad-to-narrow behavior of conductance resonances upon decreasing the coupling.

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Lattice dynamics of a disordered solid-solid interface

Cited by 50 publications

References 10 publications

Role of anharmonic phonon scattering in the spectrally decomposed thermal conductance at planar interfaces

Role of anharmonic phonon scattering in the spectrally decomposed thermal conductance at planar interfaces

Dynamics of nonequilibrium quasiparticles in narrow-gap superconducting tunnel junctions

Electron transport in nanotube–molecular-wire hybrids

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