Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum phases of a frustrated four-leg spin tube   We study the ground state phase diagram of a frustrated spin-1/2 four-leg
tube. Using a variety of complementary techniques, namely density matrix
renormalization group, exact diagonalization, Schwinger boson mean field
theory, quantum Monte-Carlo and series expansion, we explore the parameter
space of this model in the regime of all-antiferromagnetic exchange. In
contrast to unfrustrated four-leg tubes we uncover a rich phase diagram. Apart
from the Luttinger liquid fixed point in the limit of decoupled legs, this
comprises several gapped ground states, namely a plaquette, an incommensurate,
and an antiferromagnetic quasi spin-2 chain phase. The transitions between
these phases are analyzed in terms of total energy and static structure factor
calculations and are found to be of (weak) first order. Despite the absence of
long range order in the quantum case, remarkable similarities to the classical
phase diagram are uncovered, with the exception of the icommensurate regime,
which is strongly renormalized by quantum fluctuations. In the limit of large
leg exchange the tube exhibits a deconfinement cross-over from gapped magnon
like excitations to spinons.

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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: eess
1
The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph