Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum and classical Otto engine for a 2-D material: the case of a
  graphene quantum dot   In this work, we study the performance of classical and quantum magnetic Otto
cycles with a working substance composed of a single graphene quantum dot
modeled by the continuum approach with the use of the zigzag boundary
condition. Modulating an external/perpendicular magnetic field, in the
classical approach, we found a constant behavior in the total work extracted
that is not present in the quantum formulation. We find that, in the classical
approach, the engine yielded a greater performance in terms of total work
extracted and efficiency as compared with its quantum counterpart. In the
classical case, this is due to the working substance being in thermal
equilibrium at each point of the cycle, maximizing the energy extracted in the
adiabatic strokes.

8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph