Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Super-Planckian electron cooling in a van der Waals stack   Radiative heat transfer (RHT) between macroscopic bodies at separations that
are much smaller than the thermal wavelength is ruled by evanescent
electromagnetic modes and can be orders of magnitude more efficient than its
far-field counterpart, which is described by the Stefan-Boltzmann law. In this
Letter we present a microscopic theory of RHT in van der Waals stacks
comprising graphene and a natural hyperbolic material, i.e. hexagonal boron
nitride (hBN). We demonstrate that RHT between hot carriers in graphene and
hyperbolic phonon-polaritons in hBN is extremely efficient at room temperature,
leading to picosecond time scales for the carrier cooling dynamics.

12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin