Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observing the Inverse melting of the vortex lattice in
  Bi$_2$Sr$_2$CaCu$_2$O$_8$ with point defects using Langevin simulations with
  vortex shaking   Langevin dynamics simulations of the vortex matter in the highly-anisotropic
high-temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_8$ were performed. We
introduced point defects as a smoothened distribution of a random potential.
Both the electromagnetic and Josephson interactions among pancake vortices were
included. A special shaking and annealing process was introduced to let the
system approach the equilibrium configuration. We are able to see the inverse
melting transition from the Bragg-glass to the amorphous vortex glass state, in
agreement with recent experiments.

23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics