Casimir-Lifshitz Torque Enhancement by Retardation and Intervening Dielectrics

Somers, David A. T.; Munday, Jeremy N.

doi:10.1103/physrevlett.119.183001

Cited by 18 publications

(22 citation statements)

References 25 publications

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“…However, the torque between two anisotropic materials is shown here to increase, as was also observed in Ref. 12 . For the purpose of illustration, we consider methanol, chlorobenzene and bromobenzene as the background intervening media.…”

Section: B Non-identical Configurationsupporting

confidence: 87%

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Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque

et al. 2019

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Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Phys. Rev. Lett. 120, 131601 (2018)], which is applied here to study the change of sign and magnitude of the torque with separation distance in biaxial black phosphorus having excess charge carriers. The study is carried out both in vacuum as well as in a background fluid medium. The presence of extra charge carriers and that of an intervening fluid medium are both found to promote enhancement of the magnitude of the torque between identical slabs. The degree of enhancement of the magnitude of torque increases not only with an increased carrier concentration but also with separation distance. In the non-identical case when different planes of anisotropic black phosphorus face each other, owing to the non-monotonic characteristic of the sign-reversal effect of the torque, the enhancement by carrier addition and intervening medium also becomes non-monotonic with distance. In the presence of a background medium, the non-monotonic degree of enhancement of the torque is observed even between identical slabs.

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Section: B Non-identical Configurationsupporting

confidence: 87%

“…Reference 11 predicted a Casimir torque between photonic topological insulators tunable by an external magnetic field. Reference 12 showed that an intervening dielectric medium, contrary to the expectation that the medium would screen the interaction, could instead enhance the magnitude of torque by a factor of 2. More recently, Ref.…”

Section: Introductionmentioning

confidence: 99%

Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque

et al. 2019

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“…Barash calculated the torque of van der Waals forces between two anisotropic thick plates [8]. Based on previous works, Munday et al calculated the Casimir torque between parallel anisotropic plates immersed in liquid, and their recent works showed that the retardation and the intervening dielectric could enhance this torque [9,10]. As a supplementary work, Shao et al gave the analytical expression of the Casimir torque between two birefringent plates with static permittivity [11].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the previous works [9][10][11][12][13][14][15][16][17][18][19] only focused on the anisotropy of the plates and assumed that the space between the two plates was a vacuum or was filled with isotropic materials. However, in fact, this region could also be anisotropic.…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Anisotropy of the Media between Parallel Plates on the Casimir Force

Deng

Pei

et al. 2018

Symmetry

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Quantum fluctuations of the electromagnetic field give rise to the force between parallel plates: the Casimir force. We theoretically calculate the Casimir force between two parallel isotropic plates when the space between the plates is filled with anisotropic material. Our result shows that the Casimir force, especially in the direction of the force, can be significantly affected by the anisotropy of the intervening material. We also discuss the combined influence of dispersion and anisotropy, and analyze the impact of the external electric filed on the Casimir force by affecting the anisotropy of the intervening material by Kerr electro-optical effect.

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“…Barash's calculation is the theoretical basis for the experimentally motivated papers in Refs. [4,5]. The evaluation of the torque does become tractable in the nonretarded limit [6]; however, the Casimir-Lifshitz torque obtained in this way underestimates the magnitude even at 1 nm and fails to capture the non-trivial effects originating from retardation.…”

mentioning

confidence: 98%

Distance-Dependent Sign Reversal in the Casimir-Lifshitz Torque

et al. 2018

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The Casimir-Lifshitz torque between two biaxially polarizable anisotropic planar slabs is shown to exhibit a nontrivial sign reversal in its rotational sense. The critical distance a_{c} between the slabs that marks this reversal is characterized by the frequency ω_{c}∼c/2a_{c} at which the in-planar polarizabilities along the two principal axes are equal. The two materials seek to align their principal axes of polarizabilities in one direction below a_{c}, while above a_{c} their axes try to align rotated perpendicular relative to their previous minimum energy orientation. The sign reversal disappears in the nonretarded limit. Our perturbative result, derived for the case when the differences in the relative polarizabilities are small, matches excellently with the exact theory for uniaxial materials. We illustrate our results for black phosphorus and phosphorene.

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Casimir-Lifshitz Torque Enhancement by Retardation and Intervening Dielectrics

Cited by 18 publications

References 25 publications

Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque

Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque

The Impact of the Anisotropy of the Media between Parallel Plates on the Casimir Force

Distance-Dependent Sign Reversal in the Casimir-Lifshitz Torque

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