Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent tunnelling across a quantum point contact in the quantum Hall
  regime   The unique properties of quantum Hall devices arise from the ideal
one-dimensional edge states that form in a two-dimensional electron system at
high magnetic field. Tunnelling between edge states across a quantum point
contact (QPC) has already revealed rich physics, like fractionally charged
excitations, or chiral Luttinger liquid. Thanks to scanning gate microscopy, we
show that a single QPC can turn into an interferometer for specific potential
landscapes. Spectroscopy, magnetic field and temperature dependences of
electron transport reveal a quantitatively consistent interferometric behavior
of the studied QPC. To explain this unexpected behavior, we put forward a new
model which relies on the presence of a quantum Hall island at the centre of
the constriction as well as on different tunnelling paths surrounding the
island, thereby creating a new type of interferometer. This work sets the
ground for new device concepts based on coherent tunnelling.

30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin