Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground state and dynamics of the biased dissipative two-state system:
  Beyond variational polaron theory   We propose a ground-state ansatz for the Ohmic spin-boson model that improves
upon the variational treatment of Silbey and Harris for biased systems in the
scaling limit. In particular, it correctly captures the smooth crossover
behaviour expected for the ground-state magnetisation when moving between the
delocalised and localised regimes of the model, a feature that the variational
treatment is unable to properly reproduce, while it also provides a lower
ground-state energy estimate in the crossover region. We further demonstrate
the validity of our intuitive ground-state by showing that it leads to
predictions in excellent agreement with those derived from a non-perturbative
Bethe-ansatz technique. Finally, recasting our ansatz in the form of a
generalised polaron transformation, we are able to explore the dissipative
two-state dynamics beyond weak system-environment coupling within an efficient
time-local master equation formalism.

29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics