Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent Tunneling in Exciton Condensates of Bilayer Quantum Hall
  Systems   Due to strong interlayer correlations, the bilayer quantum Hall system is a
single coherent system as a whole rather than a weakly-coupled set of two
independent systems, which makes conventional tunnelling theories inapplicable.
In this paper, we develop a theory of interlayer tunnelling in coherent exciton
condensates of bilayer quantum Hall systems at total filling factor $\nu_T=1$.
One of the most important consequences of our theory is that the zero-bias
interlayer tunnelling conductance peak is strongly enhanced, but fundamentally
finite even at zero temperature. We explicitly compute the height of the
conductance peak as a function of interlayer distance, which is compared with
experiment. It is emphasized that the interlayer distance dependence of the
conductance peak is one of the key properties distinguishing between the
spontaneous coherence due to many-body effects of the Coulomb interaction and
the induced coherence due to the single-particle tunnelling gap. It is also
emphasized that, though the strongly enhanced tunnelling conductance originates
from the interlayer phase coherence, it is not the usual Josephson effect. We
propose an experimental setup for the true Josephson effect in couterflowing
current measurements for a coupled set of two bilayer quantum Hall systems,
which is a more precise analogy with the real Josephson effect in
superconductivity.

16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph