Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-dimensional ground-state mapping of a Mott-Hubbard system in a
  flexible field-effect device   A Mott insulator sometimes induces unconventional superconductivity in its
neighbors when doped and/or pressurized. Because the phase diagram should be
strongly related to the microscopic mechanism of the superconductivity, it is
important to obtain the global phase diagram surrounding the Mott insulating
state. However, the parameter available for controlling the ground state of
most Mott insulating materials is one-dimensional owing to technical
limitations. Here we present a two-dimensional ground-state mapping for a Mott
insulator using an organic field-effect device by simultaneously tuning the
bandwidth and bandfilling. The observed phase diagram showed many unexpected
features such as an abrupt first-order superconducting transition under
electron doping, a recurrent insulating phase in the heavily electron-doped
region, and a nearly constant superconducting transition temperature in a wide
parameter range. These results are expected to contribute toward elucidating
one of the standard solutions for the Mott-Hubbard model. Theoretical
calculations reproducing the main features of our experimental results have
also been conducted.

28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
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The categories of this paper are: eess
36
The categories of this paper are: cmp-lg