Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum coherence of electrons in random networks of c-axis oriented
  wedge-shaped GaN nanowalls grown by molecular beam epitaxy   The depth distribution of the transport properties as well as the temperature
dependence of the low field magneto-conductance for several c-axis oriented GaN
nanowall network samples grown with different average wall-widths are
investigated. Magneto-conductance recorded at low temperatures shows clear
signature of weak localization effect in all nanowall samples studied here. The
scattering mean free path and the phase coherence time, are extracted from the
magneto-conductance profile. Electron mobility estimated from scattering mean
free path is found to be comparable with those estimated previously from room
temperature conductivity data for these samples [Appl. Phys. Lett. 101, 132109
(2012); AIP Conf. Proc. 1583, 252 (2014)], confirming independently the
substantial mobility enhancement in these nanowalls as compared to bulk. Our
study furthermore reveals that the high electron mobility region extends down
to several hundreds of nanometer below the tip of the walls. Like mobility,
phase coherence length is found to increase with the reduction of the average
wall width. Interestingly, for samples with lower values of the average wall
width, phase coherence length is estimated to be as high as 60 micron, which is
much larger than those reported for GaN/AlGaN heterostructure based two
dimensional electron gas (2DEG) systems.

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The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex