Tunable moiré materials for probing Berry physics and topology

PC Adak, S Sinha, A Agarwal… - Nature Reviews Materials, 2024 - nature.com
Berry curvature physics and quantum geometric effects have been instrumental in
advancing topological condensed matter physics in recent decades. Although Landau level …

Superconductivity in twisted double bilayer graphene stabilized by WSe2

R Su, M Kuiri, K Watanabe, T Taniguchi, J Folk - Nature Materials, 2023 - nature.com
Identifying the essential components of superconductivity in graphene-based systems
remains a critical problem in two-dimensional materials research. This field is connected to …

Evolution of superconductivity in twisted graphene multilayers

M Long, A Jimeno-Pozo, H Sainz-Cruz… - Proceedings of the …, 2024 - pnas.org
The group of moiré graphene superconductors keeps growing, and by now it contains
twisted graphene multilayers as well as untwisted stacks. We analyze here the contribution …

Observation of a Chern insulator in crystalline ABCA-tetralayer graphene with spin-orbit coupling

Y Sha, J Zheng, K Liu, H Du, K Watanabe, T Taniguchi… - Science, 2024 - science.org
Degeneracies in multilayer graphene, including spin, valley, and layer degrees of freedom,
can be lifted by Coulomb interactions, resulting in rich broken-symmetry states. Here, we …

Observation of first-order quantum phase transitions and ferromagnetism in twisted double bilayer graphene

L Liu, X Lu, Y Chu, G Yang, Y Yuan, F Wu, Y Ji, J Tian… - Physical Review X, 2023 - APS
Twisted graphene multilayers are highly tunable flatband systems for develo** new
phases of matter. Thus far, while orbital ferromagnetism has been observed in valley …

Emergent phases in graphene flat bands

S Bhowmik, A Ghosh, U Chandni - Reports on Progress in …, 2024 - iopscience.iop.org
Electronic correlations in two-dimensional materials play a crucial role in stabilising
emergent phases of matter. The realisation of correlation-driven phenomena in graphene …

Nonlinear anomalous Hall effects probe topological phase-transitions in twisted double bilayer graphene

A Chakraborty, K Das, S Sinha, PC Adak… - 2D …, 2022 - iopscience.iop.org
Nonlinear anomalous (NLA) Hall effect is the Berry curvature dipole induced second-order
Hall voltage or temperature difference induced by a longitudinal electric field or temperature …

Spontaneous symmetry breaking and ghost states in two-dimensional fractional nonlinear media with non-Hermitian potential

M Zhong, Z Yan - Communications Physics, 2023 - nature.com
The interaction of fractional diffraction and parity-time (PT) symmetric would bring some
unique properties to certain physical system. Here we report a spontaneous symmetry …

Topological flat bands, valley polarization, and interband superconductivity in magic-angle twisted bilayer graphene with proximitized spin-orbit couplings

YZ Chou, Y Tan, F Wu, S Das Sarma - Physical Review B, 2024 - APS
We study theoretically the magic-angle twisted bilayer graphene with proximity-induced
Ising and Rashba spin-orbit couplings on the top layer. Topological flat bands (with three …

Spin-orbit coupling-enhanced valley ordering of malleable bands in twisted bilayer graphene on WSe2

S Bhowmik, B Ghawri, Y Park, D Lee, S Datta… - Nature …, 2023 - nature.com
Recent experiments in magic-angle twisted bilayer graphene have revealed a wealth of
novel electronic phases as a result of interaction-driven spin-valley flavour polarisation. In …