Casimir-Polder shift and decay rate in the presence of nonreciprocal media

Fuchs, Sebastian; Crosse, J. A.; Buhmann, Stefan Yoshi

doi:10.1103/physreva.95.023805

Cited by 29 publications

(31 citation statements)

References 53 publications

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“…While thermal photonics is so far limited to isotropic, anisotropic and gyroelectric materials [20,21], we provide a universal description for all material types to motivate similar studies of thermal-radiation phenomena with largely unexplored material types such as topological insulators, multiferroic and magnetoelectric materials. We note that the theoretical framework and the tools employed here will be useful for studying not only fluctuational [21-24, 20, 25] but also quantum [26][27][28][29][30] electrodynamic effects by using generic, bianisotropic materials.…”

Section: T T Tmentioning

confidence: 99%

Thermal spin photonics in the near-field of nonreciprocal media

Khandekar

Jacob

2019

New J. Phys.

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The interplay of spin angular momentum and thermal radiation is a frontier area of interest to nanophotonics as well as topological physics. Here, we show that a thick planar slab of a nonreciprocal material, despite being at thermal equilibrium with its environment, can exhibit nonzero photon spin angular momentum and nonzero radiative heat flux in its vicinity. We identify them as the persistent thermal photon spin and the persistent planar heat current respectively. With a practical example system, we reveal that the fundamental origin of these phenomena is connected to the spinmomentum locking of thermally excited evanescent waves. We also discover spin magnetic moment of surface polaritons that further clarifies these features. We then propose an imaging experiment based on Brownian motion that allows one to witness these surprising features by directly looking at them using a lab microscope. We further demonstrate the universal behavior of these near-field thermal radiation phenomena through a comprehensive analysis of gyroelectric, gyromagnetic and magneto-electric nonreciprocal materials. Together, these results expose a surprisingly little explored research area of thermal spin photonics with prospects for new avenues related to non-Hermitian topological photonics and radiative heat transport.

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Section: T T Tmentioning

confidence: 99%

Thermal spin photonics in the near-field of nonreciprocal media

Khandekar

Jacob

2019

New J. Phys.

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“…As another approach the Casimir forces on materials with polarisation-twisting effects have been studied. In particular the vacuum interaction properties of topological insulators [9,10] and of chiral metamaterials [11,12], have been investigated for generalised boundary conditions [13]. For the case of a scalar field confined by Robin boundary conditions, the Casimir force has been obtained to be either repulsive or attractive [14], as is also the case for thin films described as Chern-Simons boundaries [15,16].…”

Section: Introductionmentioning

confidence: 99%

Casimir effect for perfect electromagnetic conductors (PEMCs): a sum rule for attractive/repulsive forces

Rode¹,

Bennett²,

Buhmann³

2018

New J. Phys.

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We discuss the Casimir effect for boundary conditions involving perfect electromagnetic conductors, which interpolate between perfect electric conductors and perfect magnetic conductors. Based on the corresponding reciprocal Green's tensor we construct the Green's tensor for two perfectly reflecting plates with magnetoelectric coupling (non-reciprocal media) within the framework of macroscopic quantum electrodynamics. We calculate the Casimir force between two arbitrary perfect electromagnetic conductor plates, resulting in a universal analytic expression that connects the attractive Casimir force with the repulsive Boyer force. We relate the results to a duality symmetry of electromagnetism.

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“…Reference [67] extends the investigation of both nonresonant and resonant CP energies to the case of an atom near a nondispersive axionic topological insulator at zero temperature. Specifically, they consider the case of an atom with two energy levels.…”

Section: Casimir-polder Interaction Between An Atom and A Topological Insulatormentioning

confidence: 99%

The Casimir Effect in Topological Matter

2021

Universe

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We give an overview of the work done during the past ten years on the Casimir interaction in electronic topological materials, our focus being solids, which possess surface or bulk electronic band structures with nontrivial topologies, which can be evinced through optical properties that are characterizable in terms of nonzero topological invariants. The examples we review are three-dimensional magnetic topological insulators, two-dimensional Chern insulators, graphene monolayers exhibiting the relativistic quantum Hall effect, and time reversal symmetry-broken Weyl semimetals, which are fascinating systems in the context of Casimir physics. Firstly, this is for the reason that they possess electromagnetic properties characterizable by axial vectors (because of time reversal symmetry breaking), and, depending on the mutual orientation of a pair of such axial vectors, two systems can experience a repulsive Casimir–Lifshitz force, even though they may be dielectrically identical. Secondly, the repulsion thus generated is potentially robust against weak disorder, as such repulsion is associated with the Hall conductivity that is topologically protected in the zero-frequency limit. Finally, the far-field low-temperature behavior of the Casimir force of such systems can provide signatures of topological quantization.

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Casimir-Polder shift and decay rate in the presence of nonreciprocal media

Cited by 29 publications

References 53 publications

Thermal spin photonics in the near-field of nonreciprocal media

Thermal spin photonics in the near-field of nonreciprocal media

Casimir effect for perfect electromagnetic conductors (PEMCs): a sum rule for attractive/repulsive forces

The Casimir Effect in Topological Matter

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