Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermodynamic model of twisted bilayer graphene: Configuration entropy
  matters   Twisted bilayer materials have attracted tremendous attention due to their
unique and novel properties. Here, we derive a thermodynamic model for twisted
bilayer graphene (tBLG) within the framework of the classical statistical
mechanics, based on which, the configuration entropy reflecting the number of
micro-status in moire unit-cells, is directly derived from the Helmholtz free
energy with a clear physical interpretation. More importantly, we show the
configuration entropy of tBLG relative to the AB-stacked bilayer graphene is
proportional to the logarithmic function of the ratio of moire period and the
atomic lattice constant, which we found dominates the Helmholtz free energy of
tBLG and can well explain experimental observations in superlubric contacts.
Our work provides a theoretical foundation for studying moire effect of
incommensurate contact interfaces and could facilitate twisting based
applications such as superlubricity.

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The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th