Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Series-Expansion Thermal Tensor Network Approach for Quantum Lattice
  Models   In this work we propose a series-expansion thermal tensor network (SETTN)
approach for efficient simulations of quantum lattice models. This
continuous-time SETTN method is based on the numerically exact Taylor series
expansion of equilibrium density operator $e^{-\beta H}$ (with $H$ the total
Hamiltonian and $\beta$ the imaginary time), and is thus Trotter-error free. We
discover, through simulating XXZ spin chain and square-lattice quantum Ising
models, that not only the Hamiltonian $H$, but also its powers $H^n$, can be
efficiently expressed as matrix product operators, which enables us to
calculate with high precision the equilibrium and dynamical properties of
quantum lattice models at finite temperatures. Our SETTN method provides an
alternative to conventional Trotter-Suzuki renormalization group (RG)
approaches, and achieves an unprecedented standard of thermal RG simulations in
terms of accuracy and flexibility.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex