Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accessing finite momentum excitations of the one-dimensional
  Bose-Hubbard model using superlattice modulation spectroscopy   We investigate the response to superlattice modulation of a bosonic quantum
gas confined to arrays of tubes emulating the one-dimensional Bose-Hubbard
model. We demonstrate, using both time-dependent density matrix renormalization
group and linear response theory, that such a superlattice modulation gives
access to the excitation spectrum of the Bose-Hubbard model at finite momenta.
Deep in the Mott-insulator, the response is characterized by a narrow energy
absorption peak at a frequency approximately corresponding to the onsite
interaction strength between bosons. This spectroscopic technique thus allows
for an accurate measurement of the effective value of the interaction strength.
On the superfluid side, we show that the response depends on the lattice
filling. The system can either respond at infinitely small values of the
modulation frequency or only above a frequency threshold. We discuss our
numerical findings in light of analytical results obtained for the Lieb-Liniger
model. In particular, for this continuum model, bosonization predicts power-law
onsets for both responses.

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The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: stat
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc