10 citations · 23 across the 9 of their papers we have counts for
9 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…
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…
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,…
Twist Engineering of Anisotropic Excitonic and Optical Properties of a Two-Dimensional Magnetic Semiconductor
Qiuyang Li, Xiaohan Wan, Senlei Li +12
Two dimensional (2D) van der Waals (vdW) magnetic semiconductors are a new class of quantum materials for studying the emergent physics of excitons and spins in the 2D limit. Twist…
High temperature surface state in Kondo insulator UBiNi
Christopher Broyles, Xiaohan Wan, Wenting Cheng +16
The resurgence of interest in Kondo insulators has been driven by two major mysteries: the presence of metallic surface states and the observation of quantum oscillations. To furth…
Ideal topological flat bands in chiral symmetric moiré systems from non-holomorphic functions
Siddhartha Sarkar, Xiaohan Wan, Yitong Zhang +1
Recent studies on topological flat bands and their fractional states have revealed increasing similarities between moiré flat bands and Landau levels (LLs). For instance, like the…
Quantum-metric-induced quantum Hall conductance inversion and reentrant transition in fractional Chern insulators
Ang-Kun Wu, Siddhartha Sarkar, Xiaohan Wan +2
The quantum metric of single-particle wave functions in topological flatbands plays a crucial role in determining the stability of fractional Chern insulating (FCI) states. Here, w…
Symmetry-based classification of exact flat bands in single and bilayer moiré systems
Siddhartha Sarkar, Xiaohan Wan, Shi-Zeng Lin +1
We study the influence of spatial symmetries on the appearance and the number of exact flat bands (FBs) in single and bilayer systems with Dirac or quadratic band crossing points,…