Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic theory of photon-induced energy, momentum, and angular
  momentum transport in nonequilibrium   We set up a general microscopic theory for the transfer of energy, momentum,
and angular momentum mediated by photons. Using the nonequilibrium Green's
function method, we propose a unified Meir-Wingreen formalism for the energy
emitted, force experienced, and torque experienced by the objects due to the
emission of photons. Our theory does not require the local thermal equilibrium
that is the central assumption of the conventional theory of fluctuational
electrodynamics (FE). Moreover, the obtained formulas are valid for arbitrary
objects as well as the environment without the requirement of reciprocity. To
show the capability of our microscopic theory, we apply the general formulas to
transport problems of graphene edges in both equilibrium and nonequilibrium
situations. We show the local equilibrium energy radiation of graphene obeys
the $T^4$ law with a converged theoretical emissivity of 2.058$\%$. In the
nonequilibrium, we observe nonzero results for force and torque from the edges,
which go beyond the predictive ability of the FE theory. Our method is general
and efficient for large systems, which paves the way for studying more complex
transport phenomena.

3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th