Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-band Bose-Einstein condensate at four-particle scattering
  resonance   Superfluidity and superconductivity are macroscopic manifestations of quantum
mechanics, which have fascinated scientists since their discoveries roughly a
century ago. Ever since the initial theories of such quantum fluids were
formulated, there has been speculation as to the possibility of multi-component
quantum order. A particularly simple multi-component condensate is built from
particles occupying different quantum states, or bands, prior to condensation.
The particles in one or both bands may undergo condensation, as seen for
certain solids and anticipated for certain cold atom systems. For bulk solids,
the different bands always order simultaneously, with conventional pairing
characterized by complex order parameters describing the condensates in each
band. Another type of condensate, notably occurring at room temperature, has
been identified for magnons, the magnetic analogue of lattice vibrations,
injected by microwaves into yttrium iron garnet. Here we show that magnon
quantization for thin samples results in a new multi-band magnon condensate. We
establish a phase diagram, as a function of microwave drive power and frequency
relative to the magnon bands, revealing both single and multi-band
condensation. The most stable multi-band condensate is found in a narrow regime
favoured on account of a resonance in the scattering between two bands. Our
discovery introduces a flexible non-equilibrium platform operating at room
temperature for a well-characterised material, exploiting a Feshbach-like
resonance, for examining multi-band phenomena. It points to qualitatively new
ways to engineer and control condensates and superconducting states in
multiband systems and potential devices containing multiple interacting
condensates.

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The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph