Experimental and theoretical investigation of the thermal effect in the Casimir interaction from graphene

Liu, Mingyue; Zhang, Yuanzhong; Mostepanenko, V. M.; Mohideen, U.

doi:10.1103/physrevb.104.085436

Cited by 33 publications

(37 citation statements)

References 107 publications

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“…By changing ε F = (0, 200) meV, d T ∼ (35, 75) nm for Dirac and d T ∼ (15, 70) nm for standard materials. Similar results for the onset of thermal effects can be found for the retarded Casimir interaction between undoped graphene layers for which d T = ℏv F /k B T ∼ 30 nm [41][42][43][44][45]. Our calculations show that such characteristic thermal distances are typical not only for Dirac materials, but also for standard parabolic systems in 2D.…”

Section: Discussionsupporting

confidence: 85%

Dispersive interactions between standard and Dirac materials and the role of dimensionality

Rodriguez-López

Woods

2022

J. Phys. Mater.

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The van der Waals interaction plays a prominent role between neutral objects at separations where short ranged chemical forces are negligible. This type of dispersive coupling is determined by the interplay between geometry and response properties of the materials making up the objects. Here, we investigate the van der Waals interaction between 1D, 2D, and 3D standard and Dirac materials within the Random Phase Approximation, which takes into account collective excitations originating from the electronic Coulomb potential. A comprehensive understanding of characteristic functionalities and scaling laws are obtained for systems with parabolic energy dispersion (standard materials) and crossing linear bands (Dirac materials). By comparing the quantum mechanical and thermal limits the onset of thermal fluctuations in the van derWaals interaction is discussed showing that thermal effects are much pronounced at smaller scales in reduced dimensions.

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Section: Discussionsupporting

confidence: 85%

Dispersive interactions between standard and Dirac materials and the role of dimensionality

Rodriguez-López

Woods

2022

J. Phys. Mater.

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show abstract

“…By changing ε F = (0, 200) meV, d T ∼ (35, 75) nm for Dirac and d T ∼ (15, 70) nm for standard materials. Similar results for the onset of thermal effects can be found for the retarded Casimir interaction between undoped graphene layers for which d T = v F /k B T ∼ 30 nm [37,38,39,40,41]. Our calculations show that such characteristic thermal distances are typical not only for Dirac materials, but also for standard parabolic systems in 2D.…”

Section: Discussionsupporting

confidence: 85%

Dispersive interactions between standard and Dirac materials and the role of dimensionality

Le,

Rodriguez-Lopez,

Woods

2022

Preprint

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The van der Waals interaction plays a prominent role between neutral objects at separations where short ranged chemical forces are negligible. This type of dispersive coupling is determined by the interplay between geometry and response properties of the materials making up the objects. Here, we investigate the van der Waals interaction between 1D, 2D, and 3D standard and Dirac materials within the Random Phase Approximation, which takes into account collective excitations originating from the electronic Coulomb potential. A comprehensive understanding of characteristic functionalities and scaling laws are obtained for systems with parabolic energy dispersion (standard materials) and crossing linear bands (Dirac materials).By comparing the quantum mechanical and thermal limits the onset of thermal fluctuations in the van der Waals interaction is discussed showing that thermal effects are significantly pronounced at smaller scales in reduced dimensions.

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“…An important point is that the response functions of graphene strongly depend on temperature. This leads to an unexpectedly large thermal effect in the Casimir force from graphene at short separations even in the state of thermal equilibrium [53][54][55]. We show that with increasing T g the magnitude of graphene-nanoparticle force increases.…”

Section: Introductionmentioning

confidence: 82%

Casimir-Polder attraction and repulsion between nanoparticles and graphene in out-of-thermal-equilibrium conditions

Klimchitskaya,

Mostepanenko,

Tsybin

2022

Preprint

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The nonequilibrium Casimir-Polder force between a nanoparticle and a graphene sheet kept at different temperatures is investigated in the framework of Dirac model using the formalism of the polarization tensor. It is shown that the force magnitude increases with increasing temperature of a graphene sheet. At larger separations an impact of nonequilibrium conditions on the force becomes smaller. According to our results, the attractive Casimir-Polder force vanishes at some definite nanoparticle-graphene separation and becomes repulsive at larger separations if the temperature of a graphene sheet is smaller than that of the environment. This effect may find applications both in fundamental investigations of graphene and for the control of forces in microdevices of bioelectronics.

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Experimental and theoretical investigation of the thermal effect in the Casimir interaction from graphene

Cited by 33 publications

References 107 publications

Dispersive interactions between standard and Dirac materials and the role of dimensionality

Dispersive interactions between standard and Dirac materials and the role of dimensionality

Dispersive interactions between standard and Dirac materials and the role of dimensionality

Casimir-Polder attraction and repulsion between nanoparticles and graphene in out-of-thermal-equilibrium conditions

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