Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Noisy defects in a doped Mott insulator   Detailed understanding of the role of single dopant atoms in host materials
has been crucial for the continuing miniaturization in the semiconductor
industry as local charging and trapping of electrons can completely change the
behaviour of a device. Similarly, as dopants can turn a Mott insulator into a
high temperature superconductor, their electronic behaviour at the atomic scale
is of much interest. Due to limited time resolution of conventional scanning
tunnelling microscopes, most atomic scale studies in these systems focussed on
the time averaged effect of dopants on the electronic structure. Here, by using
atomic scale shot-noise measurements in the doped Mott insulator
Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+x}$, we visualize sub-nanometer sized objects
where remarkable dynamics leads to an enhancement of the tunnelling current
noise by at least an order of magnitude. From the position, current and energy
dependence we argue that these defects are oxygen dopant atoms that were
unaccounted for in previous scanning probe studies, whose local environment
leads to charge dynamics that strongly affect the tunnelling mechanism. The
unconventional behaviour of these dopants opens up the possibility to
dynamically control doping at the atomic scale, enabling the direct
visualization of the effect of local charging on e.g. high T$_{\text{c}}$
superconductivity.

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The categories of this paper are: cs
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
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The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th