Kavli Affiliate: Jie Shan
| First 5 Authors: Yiyu Xia, Yiyu Xia, , ,
| Summary:
The emergence of high transition temperature (Tc) superconductivity in
strongly correlated materials remains a major unsolved problem in physics.
High-Tc materials, such as cuprates, are generally complex and not easily
tunable, making theoretical modelling difficult. Although the Hubbard model–a
simple theoretical model of interacting electrons on a lattice–is believed to
capture the essential physics of high-Tc materials, obtaining accurate
solutions of the model, especially in the relevant regime of moderate
correlation, is challenging. The recent demonstration of robust
superconductivity in moir’e WSe2, whose low-energy electronic bands can be
described by the Hubbard model and are highly tunable, presents a new platform
for tackling the high-Tc problem. Here, we tune moir’e WSe2 bilayers to the
moderate correlation regime through the twist angle and map the phase diagram
around one hole per moir’e unit cell (v = 1) by electrostatic gating and
electrical transport and magneto-optical measurements. We observe a range of
high-Tc phenomenology, including an antiferromagnetic insulator at v = 1,
superconducting domes upon electron and hole doping, and unusual metallic
states at elevated temperatures including strange metallicity. The highest Tc
occurs adjacent to the Mott transition, reaching about 6% of the effective
Fermi temperature. Our results establish a new material system based on
transition metal dichalcogenide (TMD) moir’e superlattices that can be used to
study high-Tc superconductivity in a highly controllable manner and beyond.
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