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Moiré lattice-induced formation and tuning of hybrid dipolar excitons in twisted WS/MoSe heterobilayers
Long Zhang, Zhe Zhang, Fengcheng Wu +9
Moiré superlattices formed in van der Waals bilayers have enabled the creation and manipulation of new quantum states, as is exemplified by the discovery of superconducting and cor…
Möbius Insulator and Higher-Order Topology in MnBiTe
Rui-Xing Zhang, Fengcheng Wu, S. Das Sarma
We propose MnBiTe as a magnetically tunable platform for realizing various symmetry-protected higher-order topology. Its canted antiferromagnetic phase can host exo…
Electron-phonon and electron-electron interaction effects in twisted bilayer graphene
Sankar Das Sarma, Fengcheng Wu
By comparing with recently available experimental data from several groups, we critically discuss the manifestation of continuum many body interaction effects in twisted bilayer gr…
Three-Dimensional Topological Twistronics
Fengcheng Wu, Rui-Xing Zhang, Sankar Das Sarma
We introduce a theoretical framework for the new concept of three-dimensional (3D) twistronics by developing a generalized Bloch band theory for 3D layered systems with a constant…
Collective Excitations of Quantum Anomalous Hall Ferromagnets in Twisted Bilayer Graphene
Fengcheng Wu, Sankar Das Sarma
We present a microscopic theory for collective excitations of quantum anomalous Hall ferromagnets (QAHF) in twisted bilayer graphene. We calculate the spin magnon and valley magnon…
Electronic Structure of Single-Twist Trilayer Graphene
Xiao Li, Fengcheng Wu, Allan H. MacDonald
Small-twist-angle bilayer graphene supports strongly correlated insulating states and superconductivity. Twisted few-layer graphene systems are likely to open up new directions for…
Phonon scattering induced carrier resistivity in twisted double bilayer graphene
Xiao Li, Fengcheng Wu, S. Das Sarma
In this work we carry out a theoretical study of the phonon-induced resistivity in twisted double bilayer graphene (TDBG), in which two Bernal-stacked bilayer graphene devices are…
Ferromagnetism and superconductivity in twisted double bilayer graphene
Fengcheng Wu, Sankar Das Sarma
We present a theory of competing ferromagnetic and superconducting orders in twisted double bilayer graphene (TDBG). In our theory, ferromagnetism is induced by Coulomb repulsion,…
Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb
Jing Xu, Fengcheng Wu, Jin-Ke Bao +12
The charge and spin of the electrons in solids have been extensively exploited in electronic devices and in the development of spintronics. Another attribute of electrons - their o…
Identification of superconducting pairing symmetry in twisted bilayer graphene using in-plane magnetic field and strain
Fengcheng Wu, Sankar Das Sarma
We show how the pairing symmetry of superconducting states in twisted bilayer graphene can be experimentally identified by theoretically studying effects of externally applied in-p…