Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zero-bias anomaly in nano-scale hole-doped Mott insulators on a
  triangular silicon surface   Adsorption of 1/3 monolayer of Sn on a heavily-doped p-type Si(111) substrate
results in the formation of a hole-doped Mott insulator, with electronic
properties that are remarkably similar to those of the high-Tc copper oxide
compounds. In this work, we show that the maximum hole-density of this system
increases with decreasing domain size as the area of the Mott insulating
domains approaches the nanoscale regime. Concomitantly, scanning tunneling
spectroscopy data at 4.4 K reveal an increasingly prominent zero bias anomaly
(ZBA). We consider two different scenarios as potential mechanisms for this
ZBA: chiral d_(x^2 -y^2 )+ id_xy wave superconductivity and a dynamical Coulomb
blockade (DCB) effect. The latter arises due to the formation of a resistive
depletion layer between the nano-domains and the substrate. Both models fit the
tunneling spectra with weaker ZBAs, while the DCB model clearly fits better to
spectra recorded at higher temperatures or from the smallest domains with the
strongest ZBA. Consistently, STS spectra from the lightly-doped substrates
display oscillatory behavior that can be attributed to conventional Coulomb
staircase behavior, which becomes stronger for smaller sized domains. We
conclude that the ZBA is predominantly due to a DCB effect, while a
superconducting instability is absent or a minor contributing factor.

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The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom