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A. I. Volokitin

Publications and source records attributed to A. I. Volokitin.

At least 19 recordsLinked to original sources
arXiv2022

Fluctuation-induced friction and heat transfer at the water-multilayer graphene interface

Calculations of friction and heat transfer at the water-multilayer graphene interface using the theories of phononic and radiative friction and heat transfer are presented. The phononic contributions to friction and heat transfer are many orders of magnitude larger than the radiative contributions. Phononic friction and heat transfer slightly increase with an increase in the number of graphene layers $N$ and reach saturation at $N>5$, which is associated with an increase in the phonon transmission coefficient through the interface and a finite phonon mean free path in the direction perpendicular to the surface. The radiative contributions are almost independent on $N$, since for distance between water and graphene of the order of the interlayer distance in graphene the interaction of evanescent waves with multilayer graphene is limited by the first graphene layer. The results for the phonon contributions agree with the results obtained for the Kapitsa resistance using MD simulation and with the experimental data obtained for the friction coefficients at the water-monolayer graphene interface. The potential difference leads to a strong increase in the radiative contributions to friction and heat transfer, which become approximately an order of magnitude greater than the phononic contributions at a potential difference of $\sim 10$V.

cond-mat.mes-hall↗
arXiv2021

Enhancement of non-contact friction between metal surfaces induced by the electrical double layer

Casimir and electrostatic non-contact friction between two gold plates, and a gold tip and a gold plate, are calculated taking into account the contribution of the electrical double layer. It is shown that in an extreme-near field ($d<10$nm) the contribution from the electrical double layer leads to the enhancement of non-contact friction by many orders of magnitude in comparison to the result of the conventional theory without this contribution. Casimir and electrostatic friction dominate for short and large separations, respectively. The calculated electrostatic friction is in good agreement with experimental data. The results obtained open the way to detect the Casimir friction using Atomic Force Microscope.

cond-mat.mes-hall↗
arXiv2020

Electric double layer effect in an extreme near-field heat transfer between metal surfaces

Calculations of heat transfer between two plates of gold in an extreme near field is performed taking into account the existence of the electric double layer on metal surfaces. For d < 3nm the double layer contribution exceeds the predictions of the conversional theory of the heat transfer by several orders of magnitudes. This effect is due to a coupling between the radiation electric field and the double layer dipole moment. The results obtained can be used for the heat management at the nanoscale by intentionally changing the parameters of surface dipoles with the help of engineering.

cond-mat.mes-hall↗
arXiv2020

Contribution of the acoustic waves to near-field heat transfer

Calculations of the radiative and phonon heat transfer between metals in an extreme near field in presence of electrostatic potential difference are given. Potential difference leads to a coupling between the radiation field and acoustic waves in solid, as a result of which the heat flux between two gold plates associated with p -polarized electromagnetic waves increases by many orders of magnitude as the potential difference varies from 0 to 10V. The radiative heat transfer is compared with the phonon heat transfer associated with the electrostatic and van der Waals interactions between the surface displacements. For large potential difference and small distances the radiative heat transfer is reduced to the electrostatic phonon heat transfer. A particular case of surface acoustic waves - Rayleigh waves is studied in details. Conditions are obtained for the existence of surface phonon polaritons associated with the interaction of Rayleigh waves with an electromagnetic field. The surface Rayleigh and bulk acoustic waves can give contributions of the same order. The obtained results can be used to control heat fluxes at the nanoscale using the potential difference and to create coherent radiation sources based on the properties of the Rayleigh waves

cond-mat.mes-hall↗
arXiv2019

Electric field effect in heat transfer in 2D devices

We calculate heat transfer between a 2D sheet (e.g. graphene) and a dielectric in presence of a gate voltage. The gate potential induces surface charge densities on the sheet and dielectric, which results in electric field, which is coupled to the surface displacements and, as a consequence, resulting an additional contributions to the radiative heat transfer. The electrostatic and van der Waals interactions between the surface displacement result in the phonon heat transfer, which we calculate taking into account the nonlocality of these interactions. Numerical calculations are presented for heat transfer between graphene and a SiO$_2$ substrate.

cond-mat.mes-hall↗
arXiv2018

Enhancement of Fluctuation-Induced Electromagnetic Phenomena in dynamically nonequilibrium systems at Resonant Photon Emission

We study the resonances in Casimir friction, radiative heat transfer and heat generation for two plates sliding relative to each other. Resonances have a different origin in the frequency range of the \textit{normal} (NDE) and \textit{anomalous} (ADE) Doppler effect. In the frequency range of NDE, resonances are associated with resonant photon tunnelling between surface phonon/plasmon polaritons of plates. For two identical plates, such resonances exist only at a relative sliding velocity $v=0$. However, for different plates such resonance can exist at $v\neq 0$. In the frequency range of ADE, resonances are associated with the creation of excitations in both plates. While in the frequency range of NDE the photon emission rate has an upper limit, in the frequency range of ADE, the photon emission rate can diverge even in the presence of dissipation in the system. We consider resonances for the identical and different sliding plates. We discuss the possibility to detect Casimir friction with its limiting case of quantum friction using an atomic force microscope in graphene structures.

cond-mat.mes-hall↗
arXiv2018

Singular resonance in fluctuation-electromagnetic phenomena during the rotation of a nanoparticle near a surface

It is shown that in fluctuation-electromagnetic phenomena (Casimir force, Casimir friction, radiative heat generation) for a spherical nanoparticle with a radius $R$ rotating near a surface a singular resonance can occur, near which fluctuation-electromagnetic effects are strongly enhanced even in the presence of dissipation in the system. The resonance takes place at the particle-surface separation $ d <d_0= R[3/4\varepsilon_1''(ω_1)\varepsilon_2''(ω_2)]^{1/3}$ (where $\varepsilon_i''(ω_i)$ is the imaginary part of the dielectric function of a particle or a medium at the surface plasmon or phonon polariton frequency $ω_i$), when the rotation frequency $Ω$ coincides with the poles in the photon generation rate at $Ω\approx ω_1 + ω_2$. These poles arise due to the multiple scattering of electromagnetic waves between the particle and the surface under the conditions of the anomalous Doppler effect and they exist even in the presence of dissipation. For $ d <d_0$ in the dependence on the particle rotation frequency the Casimir force can change sign, i.e. the attraction of the particle to the surface is replaced by the repulsion. The obtained results can be important for nanotechnology.

cond-mat.mes-hall↗
arXiv2017

Anomalous Doppler Effect Singularities in the Radiative Heat Generation, Interaction Force and Frictional Torque for two Rotating Nanoparticles

We calculate the quantum heat generation, the interaction force and the frictional torque for two rotating spherical nanoparticles with a radius $R$. In contrast to the static case, when there is an upper limit in the radiative heat transfer between the particles, for two rotating nanoparticles the quantum heat generation rate diverges when the angular velocity becomes equal to the poles in the photon emission rate. These poles arise for the separation $d <d_0= R(3/\varepsilon''(ω_0))^{1/3}$ (where $\varepsilon''(ω_0)$ is the imaginary part of the dielectric function for the particle material at the surface phonon or plasmon polariton frequency $ω_0$ ) due to the anomalous Doppler effect and the mutual polarization of the particles and they exist even for the particles with losses. Similar singularities exist also for the interaction force and the frictional torque. The obtained results can be important for biomedical applications.

quant-ph↗
arXiv2016

The Casimir frictional drag force between a SiO2 tip and a graphene-covered SiO2 substrate

The possibility of the mechanical detection of the Casimir friction using the non-contact force microscope is discussed. On a SiO2 tip situated above a graphene-covered SiO2 substrate will act the frictional drag force mediated by a fluctuating electromagnetic field produced by a current in the graphene sheet. This friction force will produce the bending of the cantilever, which can be measured by state-of-art non-contact force microscope. Both the thermal and quantum contributions to the Casimir frictional drag force can be studied using this experimental setup. This result paves the ways for the mechanical detection of the Casimir friction and for the application of the frictional drag effect in micro- and nano- electromechanical devices (MEMS and NEMS).

cond-mat.mes-hall↗
arXiv2016

Quantum Vavilov-Cherenkov radiation from a small neutral particle moving parallel to a transparent dielectric plate

We study the quantum Vavilov-Cherenkov (QVC) radiation and quantum friction occurring during motion of a small neutral particle parallel to a transparent dielectric plate with the refractive index $n$. This phenomenon occurs above the threshold velocity $v_c=c/n$. The particle acceleration and rate of heating are determined by the friction force and heating power in the rest reference frame of the particle. We calculate these quantities starting from the expressions for the friction force and the radiative energy transfer in the plate-plate configuration, assuming plate at the rest in the \textit{lab} frame rarefied. Close to the light velocity there is a big difference between the friction force and the radiation power in the rest frame of a particle and in the \textit{lab} reference frame. This difference is connected with the change of the rest mass of the particle due to absorption of radiation. Close to the threshold velocity the decrease of the kinetic energy of the particle is determined mainly by radiation power in in the \textit{lab} frame. However, close to the light velocity it is determined also by the heating power for the particle. We establish the connections between the quantities in the different reference frames. For a nanoparticle the QVC radiation intensity can be comparable to classical one. We discuss the possibility to detect QVC radiation.

cond-mat.mes-hall↗
arXiv2015

Quantum Vavilov-Cherenkov radiation from shearing two transparent dielectric plates

Using a fully relativistic theory we study the quantum Vavilov-Cherenkov radiation and quantum friction occurring during relative sliding of the two transparent dielectric plates with the refractive index $n$. These phenomena occur above the threshold velocity $v_c=2nc/(n^2+1)$. Close to the threshold velocity they are dominated by the contribution from $s$--polarized electromagnetic waves, which agrees with the approximate (relativistic) theory by Pendry (J. Mod. Opt. \textbf{45}, 2389 (1998)). However, in the ultra relativistic case ($v\rightarrow c$), the contributions from both polarisations are strongly enhanced in the comparison with the approximate theory, and a new contribution occurs from the mixing of the electromagnetic waves with the different polarization. The numerical results are supplemented by an analytical treatment close to the threshold velocity and the light velocity.

cond-mat.mes-hall↗
arXiv2015

Blackbody friction force on a relativistic small neutral particle

The friction force acting on a small neutral particle during relativistic motion relative to the blackbody radiation is calculated in the framework of fluctuation electrodynamics. It is shown that the particle acceleration is determined by the friction force in the particle rest reference frame ($K^{\prime}$-frame) which in general is not equal to the friction force in the frame of the blackbody radiation ($K$-frame). The difference between the friction forces in the different frames is connected with the change of the rest mass of a particle due to the absorption and emission of radiation. The friction force in the $K^{\prime}$-frame is determined only by the interaction of a particle with the blackbody radiation. In the $K$-frame the interaction of a particle with its own thermal radiation also contributes to the friction force. For the steady state temperature of a particle the friction forces in the $K^{\prime}$-and $K$-frames are equal. For an atom the blackbody friction is determined by the electronic linewidth broadening which is calculated considering the interaction of an atom with its own radiation. In the ultrarelativistic case ($1-β\rightarrow 0$) for an atom the friction force diverges as $(1-β)^{-3}$ and the (average) temperature of an atom $T_2\approx (1-β)^{-3/8}T_1$, where $T_1$ is the temperature of the blackbody radiation and $β=V/c$. Controversies in the theory of the blackbody friction are discussed.

cond-mat.stat-mech↗
arXiv2014

Influence of electric current on the Casimir forces between graphene sheets

We investigate the dependence of the thermal Casimir force between two graphene sheets on the drift velocity of the electrons in one graphene sheet. We show that the drift motion produces a measurable change of the thermal Casimir force due to the Doppler effect. The thermal Casimir force as well as the Casimir friction are strongly enhanced in the case of resonant photon tunneling when the energy of the emitted photon coincides with the energy of electron-hole pair excitations. In the case of resonant photon tunneling, even for temperatures above room temperature the Casimir friction is dominated by quantum friction due to quantum fluctuations. Quantum friction can be detected in frictional drag experiment between graphene sheets for high electric field.

cond-mat.mes-hall↗
arXiv2014

Near-field radiative heat transfer between closely spaced graphene and amorphous SiO$_2$

We study the near-field radiative energy transfer between graphene and an amorphous SiO$_2$ substrate. In comparison with the existing theories of near-field radiative heat transfer our theory takes into account that the free carriers in graphene are moving relative to the substrate with a drift velocity $v$. In this case the heat flux is determined by both thermal and quantum fluctuations. We find that quantum fluctuations give an important contribution to the radiative energy transfer for low temperatures and high electric field (large drift velocities). For nonsuspended graphene the near-field radiative energy transfer gives a significant contribution to the heat transfer, in addition to the contribution from phononic coupling. For suspended graphene (large separation) the corresponding radiative energy transfer coefficient at nanoscale gap is $\sim$ 3 orders of magnitude larger than radiative heat transfer coefficient of the blackbody radiation limit.

cond-mat.mes-hall↗
arXiv2014

Quantum friction

We investigate the van der Waals friction between graphene and an amorphous SiO$_2$ substrate. We find that due to this friction the electric current is saturated at a high electric field, in agreement with experiment. The saturation current depends weakly on the temperature, which we attribute to the quantum friction between the graphene carriers and the substrate optical phonons. We calculate also the frictional drag between two graphene sheets caused by van der Waals friction, and find that this drag can induce a voltage high enough to be easily measured experimentally.

cond-mat.mes-hall↗
arXiv2014

Comment on "Fully covariant radiation force on a polarizable particle"

Recently Pieplow and Henkel (PH) (NJP \textbf{15} (2013) 023027) presented a new fully covariant theory of the Casimir friction force acting on small neutral particle moving parallel to flat surface. We compare results of this theory with results which follow from a fully relativistic theory of friction in plate-plate configurations in the limit when one plate is considered as sufficiently rarefied. We show that there is the agreement between these theories.

cond-mat.other↗
arXiv2013

Contact electrification and the work of adhesion

We present a general theory for the contribution from contact electrification to the work necessary to separate two solid bodies. The theory depends on the surface charge density correlation function, which we deduce from Kelvin Force Microscopy (KFM) maps of the surface electrostatic potential. For silicon rubber (polydimethylsiloxane, PDMS) we discuss in detail the relative importance of the different contributions to the observed work of adhesion.

cond-mat.soft↗