Anomalous photon thermal Hall effect

Near-field radiative heat transfer in many-body systems

“…Similar enhancement effects were reported for the heat flux along chains of nanoparticles close to a phonon-polaritonic interface (Dong et al, 2018), between two nanoparticles mediated by an intermediate macroscopic phonon polaritonic sphere (Asheichyk et al, 2017), by an anisotropic meta-surface made of graphene stripes (Zhang et al, 2019a) or a stack of graphene sheets (He et al, 2019b). As shown in (Ott and Biehs, 2020) the distance at which the maximum heat flux enhancement occurs is connected to the propagation length of surface modes (Ott and Biehs, 2020). Hence, the enhancement mechanism for the heat flux is reminiscent of the enhancement of Förster resonance energy transfer between atoms, molecules, or quantum dots which are brought in close vicinity to a plasmonic interface where also a maximal enhancement is found at distances coinciding with the propagation length of the surface modes involved in the energy transport (Biehs and Agarwal, 2013b;Bouchet et al, 2016;Poudel et al, 2016;Velizhanin and Shahbazyan, 2012) allowing for a long-range energy transfer.…”

“…In general, if either the dipole or the background or both are non-reciprocal one has T ij = T ji (Herz and Biehs, 2019;Zhu et al, 2018). It should be noted that in the literature a variety of different equivalent expressions for the transmission coefficients T ij can be found as for instance in (Ben-Abdallah et al, 2011;Ekeroth et al, 2017;Messina et al, 2013b;Nikbakht, 2014;Ott and Biehs, 2020;Ott et al, 2019a). Finally, when replacing n j − n b by n j − n i + n i − n b Eq.…”

“…in the near-field regime, much larger then the power exchange with the background (Messina et al, 2013b). When placing the dipolar objects, for instance, close to a substrate then the inter-dipole heat exchange is still dominating if the distance between the dipoles is much smaller than the distance to the substrate (Ott and Biehs, 2020). In such situations, the N -dipole system can also be treated as a closed system.…”

“…Furthermore, it should be kept in mind that by bringing the nanoparticles in close vicinity of an interface not only the heat flux between the particles increases, but also the thermal emission of the hot particle into the substrate so that the hot particle will rather tend to cool by thermal emission into the substrate then by heating the cooler nanoparticle. However, a first thermal relaxation study shows (Ott and Biehs, 2020) that by choosing wisely the distances between the nanoparticles and between the nanoparticles and the interface, a FIG. 28 (a) Sketch of heat flux between two nanoparticles through a hyperbolic multilayer meta-material.…”

The Progress and Future of Near-field Radiative Heat Transfer

“…By cooperation with conventional and specific materials, such as uniaxial hyperbolic materials, magneto-optical materials, Weyl semimetals, phase change materials, etc., the many-body system can exhibit the waveguide effect, photon thermal hall effect, superdiffusive and ballistic heat transport, nonreciprocity, anomalous photon thermal hall effect, etc. [22,[38][39][40][41][42] Meanwhile, the many-body system can greatly enrich the potential application of NFRHT, including the thermal transistor, heat engine, thermal logic gates, nonreciprocal thermal diode, heat flux switch, heat pump, etc. [22,25,27,[42][43][44][45] Therefore, compared with the two-body system, the many-body system may exhibit more anomalous NFRHT phenomena and potential applications.…”