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Symmetry, topology, and geometry: The many faces of the topological magnetoelectric effect
Perry T. Mahon, Chao Lei, Allan H. MacDonald
A delicate tension complicates the relationship between the topological magnetoelectric effect (TME) in three-dimensional (3D) topological insulators (TIs) and time-…
Pressure tunable quantum anomalous Hall states in a topological antiferromagnet
Su Kong Chong, Chao Lei, Jie Li +8
Mechanical modulation of the lattice parameter can modify the electronic structure and manipulate the magnetic coupling of a material without introducing impurities. Inspired by su…
Strong magnetic proximity effect in Van der Waals heterostructures driven by direct hybridization
C. Cardoso, A. T. Costa, A. H. MacDonald +1
We propose a new class of magnetic proximity effects based on the spin dependent hybridization between the electronic states at the Fermi energy in a non-magnetic conductor and the…
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…
Giant spin Hall effect in AB-stacked MoTe2/WSe2 bilayers
Zui Tao, Bowen Shen, Wenjin Zhao +9
The spin Hall effect (SHE), in which electrical current generates transverse spin current, plays an important role in spintronics for the generation and manipulation of spin-polari…
Kerr, Faraday, and Magnetoelectric Effects in MnBiTe Thin Films
Chao Lei, Allan H. MacDonald
The topological magneto-electric effect (TME) is a characteristic property of topological insulators. In this article, we use a simplified coupled-Dirac-cone electronic structure m…
Anomalous Landau quantization in intrinsic magnetic topological insulators
Su Kong Chong, Chao Lei, Seng Huat Lee +4
The intrinsic magnetic topological insulators, Mn(Bi1-xSbx)2Te4, in their spin-aligned strong field configuration have been identified as a Weyl semimetal with single pair of Weyl…
Bistritzer-MacDonald dynamics in twisted bilayer graphene
Alexander B. Watson, Tianyu Kong, Allan H. MacDonald +1
The Bistritzer-MacDonald (BM) model, introduced in \cite{Bistritzer2011}, attempts to capture the electronic properties of twisted bilayer graphene (TBG), even at incommensurate tw…
Emergence of Interlayer Coherence in Twist-Controlled Graphene Double Layers
Kenneth Lin, Nitin Prasad, G. William Burg +6
We report enhanced interlayer tunneling with reduced linewidth at zero interlayer bias in a twist-controlled double monolayer graphene heterostructure in the quantum Hall regime, w…
The phonon Hall viscosity of ionic crystals
B. Flebus, A. H. MacDonald
When time-reversal symmetry is broken, the low-energy description of acoustic lattice dynamics allows for a dissipationless component of the viscosity tensor, the phonon Hall visco…
Visualizing the interplay of Dirac mass gap and magnetism at nanoscale in intrinsic magnetic topological insulators
Mengke Liu, Chao Lei, Hyunsue Kim +5
In intrinsic magnetic topological insulators, Dirac surface state gaps are prerequisites for quantum anomalous Hall and axion insulating states. Unambiguous experimental identifica…
Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene
Manabendra Kuiri, Christopher Coleman, Zhenxiang Gao +6
Twisted double bilayer graphene (tDBG) comprises two Bernal-stacked bilayer graphene sheets with a twist between them. Gate voltages applied to top and back gates of a tDBG device…
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…
Colloquium: Quantum anomalous Hall effect
Cui-Zu Chang, Chao-Xing Liu, Allan H. MacDonald
The quantum Hall (QH) effect, quantized Hall resistance combined with zero longitudinal resistance, is the characteristic experimental fingerprint of Chern insulators - topological…
In-plane magnetic field induced density wave states near quantum spin Hall phase transitions
Yongxin Zeng, Fei Xue, Allan H. MacDonald
We study the influence of an in-plane magnetic field and Coulomb interactions on the physics of quantum spin Hall insulators, like those in InAs/GaSb and HgTe/CdTe quantum wells. U…
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…
Quantum Anomalous Hall Effect in Perfectly Compensated Collinear Antiferromagnetic Thin Films
Chao Lei, Olle Heinonen, R. J. McQueeney +1
We show that the quantum anomalous Hall effect almost always occurs in magnetic topological insulator thin films whenever the top and bottom surface layer magnetizations are parall…
The strong modulation limit of excitons and trions in moiré materials
Yongxin Zeng, Allan H. MacDonald
The optical properties of weakly-doped two-dimensional materials are dominated by strong exciton and trion absorption and luminescence features. In this article we examine the infl…
Fabry-Pérot cavities and quantum dot formation at gate-defined interfaces in twisted double bilayer graphene
Elías Portolés, Giulia Zheng, Folkert K. de Vries +8
The rich and electrostatically tunable phase diagram exhibited by moiré materials has made them a suitable platform for hosting single material multi-purpose devices. To engineer s…
Charged Defects and Phonon Hall Effects in Ionic Crystals
B. Flebus, A. H. MacDonald
It has been known for decades that a magnetic field can deflect phonons as they flow in response to a thermal gradient, producing a thermal Hall effect. Several recent experiments…
Large Anomalous Hall Effect in Topological Insulators Proximitized by Collinear Antiferromagnets
Chao Lei, Hua Chen, Allan H. MacDonald
CrSb is an attractive material for room-temperature antiferromagnetic spintronic applications because of its high Néel temperature 700 K and semi-metallic character. We study…
Silicon Donor Array as a Disordered One-Dimensional Electron Gas
Chao Lei, Allan H. MacDonald
Donors in silicon can now be positioned with an accuracy of about one lattice constant, making it possible in principle to form donor arrays for quantum computation or quantum simu…
In-plane critical magnetic fields in magic-angle twisted trilayer graphene
Wei Qin, Allan H. MacDonald
It has recently been shown that superconductivity in magic-angle twisted trilayer graphene survives to in-plane magnetic fields that are well in excess of the Pauli limit, and much…
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…