Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Partially Suppressed Shot Noise in Hopping Conduction   We have observed shot noise in the hopping conduction of two dimensional
carriers confined in a p-type SiGe quantum well at a temperature of 4K.
Moreover, shot noise is suppressed relative to its ``classical'' value 2eI by
an amount that depends on the length of the sample and carrier density, which
was controlled by a gate voltage. We have found a suppression factor to the
classical value of about one half for a 2 $\mu$m long sample, and of one fifth
for a 5 $\mu$m sample. In each case, the factor decreased slightly as the
density increased toward the insulator-metal transition. We explain these
results in terms of the characteristic length ($\simeq 1\mu$m in our case) of
the inherent inhomogeneity of hopping transport.

7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio