17 citations · 44 across the 10 of their papers we have counts for
11 papers
Topological Charge-Transfer Excitons
Huiyuan Zheng, Kaijie Yang, Ting Cao +1
Excitons possess internal structure absent from single-particle Bloch particles, allowing their band topology to emerge from the bound-state structure rather than being inherited f…
Electrically Programmable Correlated Topology and Magnetism in a Moiré Trilayer
Christiano Wang Beach, Courtney Baier, Kaijie Yang +15
Strong electron-electron interactions underlie a wide range of quantum many-body phenomena, including magnetism, superconductivity, and charge fractionalization. A central goal is…
Giant and Helical Exciton Dipole from Berry Curvature in Flat Chern Bands
Kaijie Yang, Huiyuan Zheng, Xiaodong Xu +2
We show that excitons forming between moiré flat Chern bands possess a substantial electric dipole moment comparable to the moiré lattice parameter times the elementary charge ($\s…
Single-pair charge-2 Weyl-Dirac composite semimetals
Hui-Jing Zheng, Ke-Xin Pang, Yun-Yun Bai +2
The Nielsen--Ninomiya theorem requires that the total topological chiral charges in a crystal vanish, a constraint typically satisfied by identical nodes like Weyl--Weyl pairs. Whe…
Förster valley-orbit coupling and topological lattice of hybrid moiré excitons
Huiyuan Zheng, Ci Li, Hongyi Yu +1
Hybrid exciton in moiré superlattices of two-dimensional (2D) semiconductors inherits the electric dipole, strong moiré trapping, and stacking optical selection rules from its inte…
Layer Coherence Origin of Planar Hall Effect: from Charge to Multipole and Valley
Huiyuan Zheng, Dawei Zhai, Cong Xiao +1
We uncover a new origin of the planar Hall effect - as an intrinsic property of layer coherent electrons - that exists even in bilayer and trilayer atomically thin limit. It reform…
Interlayer electric multipoles induced by in-plane field from quantum geometric origins
Huiyuan Zheng, Dawei Zhai, Cong Xiao +1
We show that interlayer charge transfer in 2D materials can be driven by an in-plane electric field, giving rise to electrical multipole generation in linear and second order of in…
Extraordinary Thermoelectric Properties of Topological Surface States in Quantum-Confined Cd3As2 Thin Films
Wenkai Ouyang, Alexander C. Lygo, Yubi Chen +8
Topological insulators and semimetals have been shown to possess intriguing thermoelectric properties promising for energy harvesting and cooling applications. However, thermoelect…
Dynamically tunable moiré Rydberg excitons in a monolayer semiconductor on twisted bilayer graphene
Minhao He, Jiaqi Cai, Huiyuan Zheng +8
Moiré excitons are emergent optical excitations in 2D semiconductors with deep moiré superlattice potentials. While these excitations have been realized in several platforms, a sys…
Anomalous magneto-optical response and chiral interface of dipolar excitons at twisted valleys
Huiyuan Zheng, Dawei Zhai, Wang Yao
An anomalous magneto-optical spectrum is discovered for dipolar valley excitons in twisted double layer transition metal dichalcogenides (TMD), where in-plane magnetic field induce…
Twist versus heterostrain control of optical properties of moiré exciton minibands
Huiyuan Zheng, Dawei Zhai, Wang Yao
We investigate the optical properties of interlayer excitons in heterobilayer transition metal dichalcogenides where moiré pattern is introduced by heterostrain, in comparison with…