111 citations · 344 across the 21 of their papers we have counts for
16 papers · 1 filter
Metastable magnetic domains and the anomalous resistance peak in twisted double bilayer graphene
Zhenxiang Gao, Christopher Coleman, Silvia Lüscher +7
In graphene moirés, valley polarization gives rise to orbital magnetism, manifested as an anomalous Hall effect and resulting in Barkhausen jumps in longitudinal resistance when ch…
Signatures of a ferro-Josephson effect in twisted graphene
Ruiheng Su, Zhenxiang Gao, Christopher Coleman +9
When a spin-polarized current is driven across a magnetic domain wall, the resulting spin-transfer torque may, beyond a critical threshold, set the wall's moments into precession.…
Multicomponent Magnetic Domain Walls in Rhombohedral Graphene
Mainak Das, Nemin Wei, Chunli Huang
Spatial textures of magnetic order, such as domain walls and skyrmions, are fundamental objects in magnetism. In rhombohedral multilayer graphene, magnetic order involves spin and…
High-field Josephson effect enabled by a moiré Hofstadter spectrum
A. Díez-Carlón, M. Cárdenes Wuttig, N. Wei +7
Magnetic fields generally suppress phase-coherent Josephson transport, limiting superconducting interferometry to relatively low fields. Here we show that moiré-engineered graphene…
Topological excitonic insulators in electron bilayers modulated by twisted hBN
Yongxin Zeng, Allan H. MacDonald, Nemin Wei
Equilibrium interlayer exciton condensation is common in bilayer quantum Hall systems and is characterized by spontaneous phase coherence between isolated layers. It has been predi…
Dirac-point spectroscopy of flat-band systems with the quantum twisting microscope
Nemin Wei, Felix von Oppen, Leonid I. Glazman
Motivated by the recent development of the quantum twisting microscope, we formulate a theory of elastic momentum-resolved tunneling across a planar tunnel junction between a monol…
Orbital Competition in Bilayer Graphene's Fractional Quantum Hall Effect
Bishoy M. Kousa, Nemin Wei, Allan H. MacDonald
The lowest Landau level of bilayer graphene has an octet of internal degrees of freedom, composed from spin, valley and orbital two-level systems. Dominance of orbitals over…
Landau-Level Mixing and SU(4) Symmetry Breaking in Graphene
Nemin Wei, Guopeng Xu, Inti Sodemann Villadiego +1
Recent scanning tunneling microscopy experiments on graphene at charge neutrality under strong magnetic fields have uncovered a ground state characterized by Kekulé distortion (KD)…
Gate-tunable topological phases in superlattice modulated bilayer graphene
Yongxin Zeng, Tobias M. R. Wolf, Chunli Huang +4
Superlattice potential modulation can produce flat minibands in Bernal-stacked bilayer graphene. In this work we study how band topology and interaction-induced symmetry-broken pha…
Weak localization as a probe of intervalley coherence in graphene multilayers
Nemin Wei, Yongxin Zeng, A. H. MacDonald
Spontaneous intervalley coherence is suspected in several different graphene multilayer systems, but is difficult to confirm because of a paucity of convenient experimental signatu…
Partial condensation of mobile excitons in graphene multilayers
Igor V. Blinov, Chunli Huang, Nemin Wei +3
At a large displacement field, in rhomboedral and Bernal-stacked graphene a normal paramagnetic state transitions to a correlated state. Recent experiments showed that such systems…
Spin and Orbital Metallic Magnetism in Rhombohedral Trilayer Graphene
Chunli Huang, Tobias Wolf, Wei Qin +3
We provide a complete theoretical interpretation of the metallic broken spin/valley symmetry states recently discovered in ABC trilayer graphene (ABC) perturbed by a large transver…
Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene
Chunli Huang, Nemin Wei, Wei Qin +1
We present a theory of superconductivity in twisted bilayer graphene in which attraction is generated between electrons on the same honeycomb sublattice when the system is close to…
Strong-Magnetic-Field Magnon Transport in Monolayer Graphene
Haoxin Zhou, Chunli Huang, Nemin Wei +6
At high magnetic fields, monolayer graphene hosts competing phases distinguished by their breaking of the approximate SU(4) isospin symmetry. Recent experiments have observed an ev…
Scattering of magnons at graphene quantum-Hall-magnet junctions
Nemin Wei, Chunli Huang, Allan H. MacDonald
Motivated by recent non-local transport studies of quantum-Hall-magnet (QHM) states formed in monolayer graphene's Landau level, we study the scattering of QHM magnons by gat…
Current Driven Magnetization Reversal in Orbital Chern Insulators
Chunli Huang, Nemin Wei, Allan H. MacDonald
Graphene multilayers with flat moiré minibands can exhibit the quantized anomalous Hall effect due to the combined influence of spontaneous valley polarization and topologically no…