Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficiency at maximum power of a quantum Carnot engine with temperature
  tunable baths   We investigate the efficiency at maximum power (EMP) of irreversible quantum
Carnot engines that perform finite-time cycles between two temperature tunable
baths. The temperature form we adopt can be experimentally realized in squeezed
baths in the high temperature limit, which makes our proposal of practical
relevance. Focusing on low dissipation engines, we first generalize the
pervious upper as well as lower bounds for the EMP to temperature tunable cases
in which they are solely determined by a generalized Carnot limit. As an
illustrative example, we then consider a minimal heat engine model with a
two-level spin as the working medium. It mimics a low dissipation engine as
confirmed by finite time thermodynamic optimization results. The so-obtained
EMP, being constrained by the generalized bounds, is well described by a
generalized Curzon- Ahlborn efficiency as consequences of a left/right symmetry
for a rate constant and low dissipations. Intriguing features of this minimal
heat engine under optimal power output are also demonstrated.

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The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th