Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gate-tuned Superconductor-Insulator transition in (Li,Fe)OHFeSe   The antiferromagnetic(AFM) insulator-superconductor transition has been
always a center of interest in the underlying physics of unconventional
superconductors. The quantum phase transition between Mott insulator with AFM
and superconductor can be induced by doping charge carriers in high-Tc cuprate
superconductors. For the best characterized organic superconductors of
k-(BEDT-TTF)2X (X=anion), a first order transition between AFM insulator and
superconductor can be tuned by applied external pressure or chemical pressure.
Also, the superconducting state can be directly developed from AFM insulator by
application of pressure in Cs3C60. The resemblance of these phase diagrams
hints a universal mechanism governing the unconventional superconductivity in
close proximity to AFM insulators. However, the superconductivity in iron-based
high-Tc superconductors evolves from an AFM bad metal by doping charge
carriers, and no superconductor-insulator transition has been observed so far.
Here, we report a first-order transition from superconductor to insulator with
a strong charge doping induced by ionic gating in the thin flakes of single
crystal (Li,Fe)OHFeSe. The Tc is continuously enhanced with electron doping by
ionic gating up to a maximum Tc of 43 K, and a striking
superconductor-insulator transition occurs just at the verge of optimal doping
with highest Tc. A novel phase diagram of temperature-gating voltage with the
superconductor-insulator transition is mapped out, indicating that the
superconductor -insulator transition is a common feature for unconventional
superconductivity. These results help to uncover the underlying physics of
iron-based superconductivity as well as the universal mechanism of high-Tc
superconductivity. Our finding also suggests that the gate-controlled strong
charge doping makes it possible to explore novel states of matter in a way
beyond traditional methods.

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The categories of this paper are: physics
30
The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg