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Reducing non-linear effects in Kelvin Probe Force Microscopy of back-gated 2D semiconductors
Zander Scholl, Ezra Frohlich, Natalie Rogers +6
In 2D field effect transistors the gate electrostatically dopes the 2D semiconductor (2DSC) channel, tuning the Fermi level. In principle, Kelvin probe force microscopy (KPFM) can…
Observation of High-Temperature Dissipationless Fractional Chern Insulator
Heonjoon Park, Weijie Li, Chaowei Hu +13
The fractional quantum anomalous Hall effect has recently been experimentally observed in zero-field fractional Chern insulators (FCI). However, an outstanding challenge is the pre…
On the origin of anomalous hysteresis in graphite/boron nitride transistors
Dacen Waters, Derek Waleffe, Ellis Thompson +9
Field-effect devices constructed by stacking flakes of van der Waals (vdW) materials, with hexagonal boron nitride (hBN) playing the role of gate dielectric, often exhibit virtuall…
Magnetochiral anisotropy on a quantum spin Hall edge
Youjian Chen, Gary Quaresima, Wenjin Zhao +3
We develop a theory of nonlinear low-magnetic-field magnetotransport on a helical edge of a quantum spin Hall insulator due to the edge state coupling to bulk midgap states. We foc…
Plasmonic polarization sensing of electrostatic superlattice potentials
Shuai Zhang, Jordan Fonseca, Daniel Bennett +15
Plasmon polaritons are formed by coupling light with delocalized electrons. The half-light and half-matter nature of plasmon polaritons endows them with unparalleled tunability via…
2024 roadmap on 2D topological insulators
Bent Weber, Michael S Fuhrer, Xian-Lei Sheng +22
2D topological insulators promise novel approaches towards electronic, spintronic, and quantum device applications. This is owing to unique features of their electronic band struct…
Ferromagnetism and Topology of the Higher Flat Band in a Fractional Chern Insulator
Heonjoon Park, Jiaqi Cai, Eric Anderson +18
The recent observation of the fractional quantum anomalous Hall effect in moiré fractional Chern insulators provides an opportunity to investigate zero magnetic field anyons. To po…
Revealing the conduction band and pseudovector potential in 2D moiré semiconductors
Abigail J. Graham, Heonjoon Park, Paul V. Nguyen +12
Stacking monolayer semiconductors results in moiré patterns that host many correlated and topological electronic phenomena, but measurements of the basic electronic structure under…
Extrinsic nonlinear Kerr rotation in topological materials under a magnetic field
Shuang Wu, Zaiyao Fei, Zeyuan Sun +10
Topological properties in quantum materials are often governed by symmetry and tuned by crystal structure and external fields, and hence symmetry-sensitive nonlinear optical measur…
Visualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures
Shuai Zhang, Yang Liu, Zhiyuan Sun +28
Ferroelectricity, a spontaneous and reversible electric polarization, is found in certain classes of van der Waals (vdW) material heterostructures. The discovery of ferroelectricit…
Observation of Fractionally Quantized Anomalous Hall Effect
Heonjoon Park, Jiaqi Cai, Eric Anderson +17
The integer quantum anomalous Hall (QAH) effect is a lattice analog of the quantum Hall effect at zero magnetic field. This striking transport phenomenon occurs in electronic syste…
Magnetotransport on quantum spin Hall edge coupled to bulk midgap states
Youjian Chen, Wenjin Zhao, Elliott Runburg +2
We consider magnetotransport on a helical edge of a quantum spin Hall insulator, in the presence of bulk midgap states ``side-coupled" to the edge. In the presence of a magnetic fi…
Gate-tunable proximity effects in graphene on layered magnetic insulators
Chun-Chih Tseng, Tiancheng Song, Qianni Jiang +11
The extreme versatility of two-dimensional van der Waals (vdW) materials derives from their ability to exhibit new electronic properties when assembled in proximity with dissimilar…
Symmetry-broken Chern insulators in twisted double bilayer graphene
Minhao He, Jiaqi Cai, Ya-Hui Zhang +7
Twisted double bilayer graphene (tDBG) has emerged as an especially rich platform for studying strongly correlated and topological states of matter. The material features moiré ban…
Electric control of a canted-antiferromagnetic Chern insulator
Jiaqi Cai, Dmitry Ovchinnikov, Zaiyao Fei +11
The interplay between band topology and magnetism can give rise to exotic states of matter. For example, magnetically doped topological insulators can realize a Chern insulator tha…
Electrically tunable correlated and topological states in twisted monolayer-bilayer graphene
Shaowen Chen, Minhao He, Ya-Hui Zhang +8
Twisted van der Waals heterostructures with flat electronic bands have recently emerged as a platform for realizing correlated and topological states with an extraordinary degree o…
Monolayer Semiconductor Auger Detector
Colin M. Chow, Hongyi Yu, John R. Schaibley +9
Auger recombination in semiconductors is a many-body phenomenon in which recombination of electrons and holes is accompanied by excitation of other charge carriers. Being nonradiat…
Magnetic proximity and nonreciprocal current switching in a monolayer WTe2 helical edge
Wenjin Zhao, Zaiyao Fei, Tiancheng Song +8
The integration of diverse electronic phenomena, such as magnetism and nontrivial topology, into a single system is normally studied either by seeking materials that contain both i…
Switching 2D Magnetic States via Pressure Tuning of Layer Stacking
Tiancheng Song, Zaiyao Fei, Matthew Yankowitz +15
The physical properties of two-dimensional van der Waals (2D vdW) crystals depend sensitively on the interlayer coupling, which is intimately connected to the stacking arrangement…
Visualizing electrostatic gating effects in two-dimensional heterostructures
Paul V. Nguyen, Natalie C. Teutsch, Nathan P. Wilson +9
The ability to directly observe electronic band structure in modern nanoscale field-effect devices could transform understanding of their physics and function. One could, for examp…
Atomically Thin CrCl3: An in-Plane Layered Antiferromagnetic Insulator
Xinghan Cai, Tiancheng Song, Nathan P. Wilson +10
The recent discovery of magnetism in atomically thin layers of van der Waals (vdW) crystals has created new opportunities for exploring magnetic phenomena in the two-dimensional (2…
Gate-induced superconductivity in a monolayer topological insulator
Ebrahim Sajadi, Tauno Palomaki, Zaiyao Fei +7
The layered semimetal WTe_2 has recently been found to be a two-dimensional topological insulator (2D TI) when thinned down to a single monolayer, with conducting helical edge chan…
Imaging Quantum Spin Hall Edges in Monolayer WTe2
Yanmeng Shi, Joshua Kahn, Ben Niu +9
A two-dimensional (2D) topological insulator (TI) exhibits the quantum spin Hall (QSH) effect, in which topologically protected spin-polarized conducting channels exist at the samp…
Voltage Control of a van der Waals Spin-Filter Magnetic Tunnel Junction
Tiancheng Song, Matisse Wei-Yuan Tu, Caitlin Carnahan +8
Atomically thin chromium triiodide (CrI3) has recently been identified as a layered antiferromagnetic insulator, in which adjacent ferromagnetic monolayers are antiferromagneticall…