7 papers
Tunable Multiband Geometry and Fractional Phases in Higher Vortexable Systems
Xiaohan Wan, Siddhartha Sarkar, Ting Cao +3
Higher vortexability is often viewed as a route to topological flat bands with higher-Landau-level-like quantum geometry. Here we emphasize a complementary perspective: it provides…
How Similar Can Fractional Chern Insulators Be to Fractional Quantum Hall States? Moiré-Enhanced Gaps and Excitation-Spectrum Correspondence
Siddhartha Sarkar, Yitong Zhang, Kai Sun
Fractional Chern insulators (FCIs) realize fractional quantum Hall topology in lattice bands, but their excitation spectra remain far less understood than their ground states. Here…
Mechanochemical feedback drives complex inertial dynamics in active solids
Siddhartha Sarkar, Biswarup Ash, Yueyang Wu +3
Active solids combine internal active driving with elasticity to realize states with nonequilibrium mechanics and autonomous motion. They are often studied in overdamped settings,…
Unconventional Fractional Phases in Multi-Band Vortexable Systems
Siddhartha Sarkar, Xiaohan Wan, Ang-Kun Wu +2
In this Letter, we study topological flat bands with distinct features that deviate from conventional Landau level behavior. We show that even in the ideal quantum geometry limit,…
Beyond the Lowest Landau Level: Unlocking More Robust Fractional States Using Flat Chern Bands with Higher Vortexability
Yitong Zhang, Siddhartha Sarkar, Xiaohan Wan +3
Enhancing the many-body gap of a fractional state is crucial for realizing robust fractional excitations. For fractional Chern insulators, existing studies suggest that making flat…
Tunable symmetry breaking in a hexagonal-stacked moiré magnet
Zeliang Sun, Gaihua Ye, Xiaohan Wan +13
Symmetry plays a central role in defining magnetic phases, making tunable symmetry breaking across magnetic transitions highly desirable for discovering non-trivial magnetism. Magn…