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Quantitative determination of interlayer electronic coupling at various critical points in bilayer MoS2
Wei-Ting Hsu, Jiamin Quan, Chi-Ruei Pan +7
Tailoring interlayer coupling has emerged as a powerful tool to tune the electronic structure of van der Waals (vdW) bilayers. One example is the usage of the moire pattern to crea…
Spin-correlated exciton-polaritons in a van der Waals magnet
Florian Dirnberger, Rezlind Bushati, Biswajit Datta +4
Strong coupling between light and elementary excitations is emerging as a powerful tool to engineer the properties of solid-state systems. Spin-correlated excitations that couple s…
Confined monolayer Ag as a large gap 2D semiconductor and its momentum resolved excited states
Woojoo Lee, Yuanxi Wang, Wei Qin +11
2D materials have intriguing quantum phenomena that are distinctively different from their bulk counterparts. Recently, epitaxially synthesized wafer-scale 2D metals, composed of e…
Anomalous Hall antiferromagnets
Libor Smejkal, Allan H. MacDonald, Jairo Sinova +2
The Hall effect, in which current flows perpendicular to an applied electrical bias, has played a prominent role in modern condensed matter physics over much of the subject's histo…
Strongly correlated excitonic insulator in atomic double layers
Liguo Ma, Phuong X. Nguyen, Zefang Wang +6
Excitonic insulators (EI) arise from the formation of bound electron-hole pairs (excitons) in semiconductors and provide a solid-state platform for quantum many-boson physics. Stro…
WSe2/WS2 moiré superlattices: a new Hubbard model simulator
Yanhao Tang, Lizhong Li, Tingxin Li +8
The Hubbard model, first formulated by physicist John Hubbard in the 1960s, is a simple theoretical model of interacting quantum particles in a lattice. The model is thought to cap…
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…
Energy-resolved Photoconductivity Mapping in a Monolayer-bilayer WSe2 Lateral Heterostructure
Zhaodong Chu, Ali Han, Chao Lei +10
Vertical and lateral heterostructures of van der Waals materials provide tremendous flexibility for band structure engineering. Since electronic bands are sensitively affected by d…
Chiral transport and electronic correlations in surface states of HfNiSn single crystals
L. Steinke, J. J. Kistner-Morris, T. F. Lovorn +9
In most topological insulators, the valence and conduction band appear in reverse or inverted order compared to an equivalent insulator with isolated atoms. Here, we explore a diff…
Observation of Rydberg exciton polaritons and their condensate in a perovskite cavity
Wei Bao, Xiaoze Liu, Fei Xue +13
The condensation of half-light half-matter exciton polaritons in semiconductor optical cavities is a striking example of macroscopic quantum coherence in a solid state platform. Qu…
Spatially-indirect Exciton Condensate Phases in Double Bilayer Graphene
Jung-Jung Su, Allan H. MacDonald
We present a theory of spatially indirect exciton condensate states in systems composed of a pair of electrically isolated Bernal graphene bilayers. The ground state phase diagram…
Interface-Induced Phenomena in Magnetism
Frances Hellman, Axel Hoffmann, Yaroslav Tserkovnyak +24
This article reviews static and dynamic interfacial effects in magnetism, focusing on interfacially-driven magnetic effects and phenomena associated with spin-orbit coupling and in…
Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states
Zilong Jiang, Cui-Zu Chang, Massoud Ramezani Masir +5
Spin-momentum locking in protected surface states enables efficient electrical detection of magnon decay at a magnetic-insulator/topological-insulator heterojunction. Here we demon…
Linear magnetoresistance induced by intra-scattering semiclassics of Bloch electrons
Cong Xiao, Hua Chen, Yang Gao +3
The weak field magnetoresistance has seen a revived interest due to the distinct role played by the momentum-space Berry curvature of Bloch electrons. While most previous studies i…
First-principles theory of electron-spin fluctuation coupling and superconducting instabilities in iron selenide
Johannes Lischner, Timur Bazhirov, Allan H. MacDonald +2
We present first-principles calculations of the coupling of quasiparticles to spin fluctuations in iron selenide and discuss which types of superconducting instabilities this coupl…
Revealing the electronic band structure of trilayer graphene on SiC: An angle-resolved photoemission study
Camilla Coletti, Stiven Forti, Alessandro Principi +10
In recent times, trilayer graphene has attracted wide attention owing to its stacking and electric field dependent electronic properties. However, a direct and well-resolved experi…
Effect of spin fluctuations on quasiparticle excitations: first-principles theory and application to sodium and lithium
Johannes Lischner, Timur Bazhirov, Allan H. MacDonald +2
We present first-principles calculations for quasiparticle excitations in sodium and lithium including the effects of charge and spin fluctuations. We employ the Overhauser-Kukkone…
Anomalous Hall effect arising from noncollinear antiferromagnetism
Hua Chen, Qian Niu, A. H. MacDonald
In most conductors current flow perpendicular to electric field direction (Hall current) can be explained in terms of the Lorentz forces present when charged particles flow in an e…
Gate-Tunable Exchange Coupling Between Cobalt Clusters on Graphene
Hua Chen, Qian Niu, Zhenyu Zhang +1
We use spin-density-functional theory (SDFT) ab initio calculations to theoretically explore the possibility of achieving useful gate control over exchange coupling between cobalt…
Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
Alexander B. Khanikaev, S. Hossein Mousavi, Wang-Kong Tse +3
Recent progress in understanding the topological properties of condensed matter has led to the discovery of time-reversal invariant topological insulators. Because of limitations i…
Band Structure of ABC-Stacked Graphene Trilayers
Fan Zhang, Bhagawan Sahu, Hongki Min +1
The ABC-stacked N-layer-graphene family of two-dimensional electron systems is described at low energies by two remarkably flat bands with Bloch states that have strongly momentum-…
Finite Conductivity Minimum in Bilayer Graphene without Charge Inhomogeneities
Maxim Trushin, Janik Kailasvuori, John Schliemann +1
Boltzmann transport theory fails near the linear band-crossing of single-layer graphene and near the quadratic band-crossing of bilayer graphene. We report on a numerical study whi…
Influence of a Transport Current on Magnetic Anisotropy in Gyrotropic Ferromagnets
Ion Garate, Allan H. MacDonald
Current-induced torques are commonly used to manipulate non-collinear magnetization configurations. In this article we discuss current-induced torques present in a certain class of…
Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Hongki Min, A. H. MacDonald
We show that the origin of the universal optical conductivity in a normal -layer graphene multilayer is an emergent chiral symmetry which guarantees that in both…