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Published on: July 11, 2025
Quantum Phase Transitions in Graphene Coupled to a Twisted WSe2 Moiré Ferroelectricity
Budhi Singh1, Yasir Hassan2, Nasir Ali1
1SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea.
None:
Sublattice symmetry in graphene governs its Dirac semimetal behavior, where electrons exhibit linear dispersion, limiting its potential for technological applications. Here, moiré ferroelectricity in twisted WSe2 (t-WSe2) is exploited to break graphene's sublattice symmetry, inducing a metal-to-insulator transition (MIT) near room temperature. The periodic polarization domains in t-WSe2 imprint an electrostatic potential onto graphene, breaking its sublattice symmetry and leading to the emergence of a local Dirac point, as observed in the transfer characteristics of a t-WSe2/graphene field-effect transistor. Temperature-dependent transport measurements reveal multiple MIT points at relatively high temperatures, attributed to the room-temperature ferroelectric polarization in t-WSe2. Furthermore, A distinct metallic phases is identified exhibiting T2 and linear-T dependent longitudinal resistance under electrostatic doping, indicative of Fermi-liquid and non-Fermi-liquid metallic behavior, respectively. Finally, finite-size scaling analysis of Rxx near the MIT points indicates continuous quantum phase transitions near room temperature, establishing moiré ferroelectricity as a pathway for engineering quantum electronic phases of monolayer graphene at ambient conditions.
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