Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic susceptibility of quantum spin systems calculated by sine
  square deformation: one-dimensional, square lattice, and kagome lattice
  Heisenberg antiferromagnets   We develop a simple and unbiased numerical method to obtain the uniform
susceptibility of quantum many body systems. When a Hamiltonian is spatially
deformed by multiplying it with a sine square function that smoothly decreases
from the system center toward the edges, the size-scaling law of the excitation
energy is drastically transformed to a rapidly converging one. Then, the local
magnetization at the system center becomes nearly size independent; the one
obtained for the deformed Hamiltonian of a system length as small as L=10
provides the value obtained for the original uniform Hamiltonian of L=100. This
allows us to evaluate a bulk magnetic susceptibility by using the magnetization
at the center by existing numerical solvers without any approximation,
parameter tuning, or the size-scaling analysis. We demonstrate that the
susceptibilities of the spin-1/2 antiferromagnetic Heisenberg chain and square
lattice obtained by our scheme at L=10 agree within 10 to (-3) with exact
analytical and numerical solutions for L=infinite down to temperature of 0.1
times the coupling constant. We apply this method to the spin-1/2 kagome
lattice Heisenberg antiferromagnet which is of prime interest in the search of
spin liquids.

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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
1
The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
9
The categories of this paper are: nlin