Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mapping of the unoccupied states and relevant bosonic modes via the time
  dependent momentum distribution   The unoccupied states of complex materials are difficult to measure, yet play
a key role in determining their properties. We propose a technique that can
measure the unoccupied states, called time-resolved Compton scattering, which
measures the time-dependent momentum distribution (TDMD). Using a
non-equilibrium Keldysh formalism, we study the TDMD for electrons coupled to a
lattice in a pump-probe setup. We find a direct relation between temporal
oscillations in the TDMD and the dispersion of the underlying unoccupied
states, suggesting that both can be measured by time-resolved Compton
scattering. We demonstrate the experimental feasibility by applying the method
to a model of MgB$_2$ with realistic material parameters.

11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an