We report on the first measurement of a temperature dependence Casimir-Polder force. This was obtained by positioning nearly pure 87Rb Bose-Einstein condensate few microns from dielectric substrate and exciting its dipole oscillation. Changes in collective oscillation frequency magnetically trapped atoms result spatial variations surface-atom In our experiment, is heated up to 605 K, while surrounding environment kept near room (310 K). The effect force measured be 3 times larger for K than...

The study of open quantum systems often relies on approximate master equations derived under the assumptions weak coupling to environment. However when system is made several interacting subsystems such a derivation in many cases very hard. An alternative method, employed especially modelling transport mesoscopic systems, consists using {\it local} containing Lindblad operators acting locally only corresponding subsystem. It has been shown that this approach however generates inconsistencies...

We study the radiative heat transfer between multilayer structures made by a periodic repetition of graphene sheet and hexagonal boron nitride (hBN) slab. Surface plasmons in monolayer can couple with hyperbolic phonon polaritons single hBN film to form hybrid that assist photon tunneling. For graphene/hBN structures, stacked metallic/dielectric array give rise further effective behavior, addition intrinsic natural behavior hBN. The hyperbolicity enable more enhance tunneling hence...

The Casimir-Polder-Lifshitz force felt by an atom near the surface of a substrate is calculated out thermal equilibrium in terms dielectric function material and atomic polarizability. new decays like $1/{z}^{3}$ at large distances (i.e., slower than equilibrium), exhibits sizable temperature dependence, attractive or repulsive depending on whether higher smaller one environment. Our predictions can be relevant for experiments with ultracold gases. Both metal substrates are considered.

We calculate the effect of interaction between an optically active material and a Bose-Einstein condensate on collective oscillations condensate. provide explicit expressions for frequency shift center mass oscillation in terms potential generated by substrate density profile gas. The form is discussed details various regimes (van der Waals-London, Casimir-Polder thermal regimes) are identified as function distance atoms from surface. Numerical results shifts given case sapphire dielectric...

We study the radiative heat transfer and Casimir-Lifshitz force occurring between two bodies in a system out of thermal equilibrium. consider arbitrary shape dielectric properties, held at different temperatures immersed environmental radiation third temperature. derive explicit closed-form analytic expressions for correlations electromagnetic field terms bodies' scattering matrices. then some particular cases which we investigate detail: atom-surface slab-slab configurations.

We study the Casimir-Lifshitz interaction out of thermal equilibrium, when interacting objects are at different temperatures. The analysis is focused on surface-surface, surface-rarefied body, and surface-atom configurations. A systematic investigation contributions to force coming from propagating evanescent components electromagnetic radiation performed. large distance behaviors such interactions discussed, both analytical numerical results compared with equilibrium ones. detailed crossing...

Resonant tunneling of surface polaritons across a subwavelength vacuum gap between two polar or metallic bodies at different temperatures leads to an almost monochromatic heat transfer which can exceed by several orders magnitude the far-field upper limit predicted Planck's blackbody theory. However, despite its strong magnitude, this is very far from maximum theoretical in near-field. Here we propose amplifier for photon based on passive relay system intercalated bodies, able partially...

Thermal diodes, which allow heat transfer in a preferential direction while being blocked reverse direction, have numerous applications thermal management, information processing, energy harvesting, etc. Typical materials of diodes previous works include phase-change and magneto-optical materials. However, such highly depend on specific working temperatures or external magnetic fields. In this work, we propose near-field radiative diode (NFRTD) based two Weyl semimetals (WSMs) nanoparticles...

We study the Casimir-Lifshitz force and radiative heat transfer occurring between two arbitrary bodies, each one held at a given temperature, surrounded by environmental radiation third temperature. The system, in stationary configuration out of thermal equilibrium, is characterized depending on three temperatures, explicitly expressed terms scattering operators body. find closed-form analytic expression valid for bodies any geometry dielectric properties. As an example, parallel slabs...

We study the Casimir-Lifshitz force and radiative heat transfer in a system consisting of three bodies held at independent temperatures immersed thermal environment, whole being stationary configuration out equilibrium. The theory we develop is valid for arbitrary bodies, i.e., any set temperatures, dielectric, geometrical properties, describes each body by means its scattering operators. For three-body provide closed-form unified expression (both equilibrium). This thus first applied to...

In this letter, active control of near-field radiative heat transfer (NFRHT) between two isotropic materials is realized by a coating-twisting method. The slabs are coated with graphene gratings, and then the NFRHT can be not only enhanced, but also weakened, tuning twisted angle gratings. physical mechanism attributed to modes coupled gratings material, which vary angle. proposed method applicable for other kinds anisotropic films, may provide way realize high-precision nanoscale thermal...

Heat flux exchanged between two hot bodies at subwavelength separation distances can exceed the limit predicted by blackbody theory. However, this super-Planckian transfer is restricted to these distances. Here we demonstrate possible existence of a arbitrary large if interacting are connected in near field with weakly dissipating hyperbolic waveguides. This result opens way long-distance transport near-field thermal energy.

A general theory of photon-mediated energy and momentum transfer in $N$-body planar systems out thermal equilibrium is introduced. It based on the combination scattering fluctuational-electrodynamics approach many-body systems. By making a Landauer-like formulation heat problem, explicit formulas for transmission coefficients between two distinct slabs as well self-coupling are derived expressed terms reflection single bodies. We also show how to calculate local temperatures such An...

We propose a scheme for quantum thermal machine made by atoms interacting with single nonequilibrium electromagnetic field. The field is produced simple configuration of macroscopic objects held at equilibrium different temperatures. show that these machines can deliver all thermodynamic tasks (cooling, heating, and population inversion) establishing coherence the body on which they act. Remarkably, this system allows to reach efficiencies maximum power very close Carnot limit, much more...

Metasurfaces, the two-dimensional (2D) counterpart of metamaterials, have recently attracted a great deal attention due to their amazing properties, including negative refraction, hyperbolic dispersion, and manipulation evanescent spectrum. In this work, theory model is proposed for near field radiative heat transfer (NFRHT) between two nanoparticles in presence an anisotropic metasurface. Specifically, metasurface modeled as array graphene strips (GS), which ideal platform implement any...

We theoretically study the Casimir-Polder force on an atom in a arbitrary initial state rather general electromagnetic environment wherein materials may have nonreciprocal bianisotropic dispersive response. It is shown that under Markov approximation has resonant and nonresonant contributions. obtain explicit expressions for optical both terms of system Green function modes. apply theory to particular case two-level interacts with topological gyrotropic material, showing nonreciprocity...

Quantum fluctuations give rise to Casimir forces between two parallel conducting plates, the magnitude of which increases monotonically as separation decreases. By introducing nanoscale gratings surfaces, recent advances have opened opportunities for controlling force in complex geometries. Here, we measure rectangular regimes not accessible before. Using an on-chip detection platform, achieve accurate alignment so that they interpenetrate is reduced. Just before interpenetration occurs,...

Charge-order states of broken symmetry, such as charge density wave (CDW), are able to induce exceptional physical properties, however, the precise understanding underlying physics is still elusive. Here, we combine fluctuational electrodynamics and functional theory reveal an unconventional thermophotonic effect in CDW-bearing ${\mathrm{TiSe}}_{2}$, referred thermophotonic-CDW ($tp$-CDW). The interplay plasmon polariton CDW electron excitations give rise anomalous negative temperature...

The Casimir interaction and torque are related phenomena originating from the exchange of electromagnetic excitations between objects. While force exists any types objects, materials or geometrical anisotropy drives emergence torque. Here both studied theoretically dielectric films with immersed parallel single wall carbon nanotubes in dilute limit their chirality collective electronic optical response properties taken into account. It is found that dominated by thermal fluctuations at...

Based on a tight-binding model for the electron system, we investigate transfer of energy, momentum, and angular momentum mediated by electromagnetic fields among buckminsterfullerene (${\mathrm{C}}_{60}$) graphene nanostrips. Our nonequilibrium Green's function approach enables calculations away from local thermal equilibrium where fluctuation-dissipation theorem breaks down. For example, forces between ${\mathrm{C}}_{60}$ current-carrying nanostrips are predicted. It is found that presence...

We investigate the behavior of dark solitons in a superfluid Fermi gas along BCS-BEC crossover by solving Bogoliubov - de Gennes equations and looking for real odd solutions order parameter. show that resonance unitary region, where scattering length is large, density profile soliton has deep minimum, differently from what happens BCS regime. The gap found to be significantly quenched presence due occurrence Andreev fermionic bound states localized near nodal plane

We calculate the radiative heat transfer between two identical metallic one-dimensional lamellar gratings. To this aim we present and exploit a modification to widely used Fourier modal method, known as adaptive spatial resolution, based on stretch of coordinate associated with periodicity grating. first show that technique dramatically improves rate convergence when calculating flux, allowing us explore smaller separations. then study flux function grating height, highlighting remarkable...