Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectroscopy of ultracold atoms by periodic lattice modulations   We present a non-perturbative analysis of a new experimental technique for
probing ultracold bosons in an optical lattice by periodic lattice depth
modulations. This is done using the time-dependent density-matrix
renormalization group method. We find that sharp energy absorption peaks are
not unique to the Mott insulating phase at commensurate filling, but also exist
for superfluids at incommensurate filling. For strong interactions the peak
structure provides an experimental measure of the interaction strength.
Moreover, the peak height of the second peak can be employed as a measure of
the incommensurability of the system.

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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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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: quant-ph