A5030175936- 2D Materials and Applications
- Topological Materials and Phenomena
- Graphene research and applications
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Perovskite Materials and Applications
- Advanced Condensed Matter Physics
- Iron-based superconductors research
- Electronic and Structural Properties of Oxides
- Ferroelectric and Negative Capacitance Devices
- Advanced Thermoelectric Materials and Devices
- Rare-earth and actinide compounds
- MXene and MAX Phase Materials
- Multiferroics and related materials
- Machine Learning in Materials Science
- Atomic and Subatomic Physics Research
- Inorganic Chemistry and Materials
- Magnetic Properties of Alloys
- Advanced Thermodynamics and Statistical Mechanics
- Molecular Junctions and Nanostructures
- Neonatal and fetal brain pathology
- Advanced Physical and Chemical Molecular Interactions
- Phase-change materials and chalcogenides
Princeton University
2023-2025
University of Wisconsin–Madison
2024-2025
University of Washington
2018-2022
Zhengzhou University
2022
Magnetic multilayer devices that exploit magnetoresistance are the backbone of magnetic sensing and data storage technologies. Here, we report multiple-spin-filter tunnel junctions (sf-MTJs) based on van der Waals (vdW) heterostructures in which atomically thin chromium triiodide (CrI3) acts as a spin-filter barrier sandwiched between graphene contacts. We demonstrate tunneling is drastically enhanced with increasing CrI3 layer thickness, reaching record 19,000% for structures using...
The recent discovery of magnetism in atomically thin layers van der Waals (vdW) crystals has created new opportunities for exploring magnetic phenomena the two-dimensional (2D) limit. In most 2D magnets studied to date c-axis is an easy axis, so that at zero applied field polarization each layer perpendicular plane. Here, we demonstrate CrCl3 a layered antiferromagnetic insulator with easy-plane normal c-axis, plane and no preferred direction within it. Ligand photoluminescence 870 nm...
Moiré superlattices of twisted nonmagnetic two-dimensional (2D) materials are highly controllable platforms for the engineering exotic correlated and topological states. Here, we report emerging magnetic textures in small-angle 2D magnet chromium triiodide (CrI3). Using single-spin quantum magnetometry, directly visualized nanoscale domains periodic patterns, a signature moiré magnetism, measured domain size magnetization. In bilayer CrI3, observed coexistence antiferromagnetic (AFM)...
Atomically thin chromium triiodide (CrI3) has recently been identified as a layered antiferromagnetic insulator, in which adjacent ferromagnetic monolayers are antiferromagnetically coupled. This unusual magnetic structure naturally comprises series of anti-aligned spin filters can be utilized to make spin-filter tunnel junctions with very large tunneling magnetoresistance (TMR). Here we report voltage control TMR formed by four-layer CrI3 sandwiched monolayer graphene contacts dual-gated...
MnBi2Te4, a van der Waals magnet, is an emergent platform for exploring Chern insulator physics. Its layered antiferromagnetic order was predicted to enable even–odd layer number dependent topological states. Furthermore, it becomes when all spins are aligned by applied magnetic field. However, the evolution of bulk electronic structure as state continuously tuned and its dependence on remains unexplored. Here, employing multimodal probes, we establish one-to-one correspondence between...
Magnetic-domain structure and dynamics play an important role in understanding controlling the magnetic properties of two-dimensional magnets, which are interest to both fundamental studies applications[1-5]. However, probe methods based on spin-dependent optical permeability[1,2,6] electrical conductivity[7-10] can neither provide quantitative information magnetization nor achieve nanoscale spatial resolution. These capabilities essential image understand rich domains. Here, we employ...
A central theme in condensed matter physics is to create and understand the exotic states of by incorporating magnetism into topological materials. One prime example quantum anomalous Hall (QAH) state. Recently, MnBi2Te4 has been demonstrated be an intrinsic magnetic insulator QAH effect was observed exfoliated flakes. Here, we used molecular beam epitaxy (MBE) grow films with thickness down 1 septuple layer (SL) performed thickness-dependent transport measurements. We a non-square...
Abstract The interplay between band topology and magnetism can give rise to exotic states of matter. For example, magnetically doped topological insulators realize a Chern insulator that exhibits quantized Hall resistance at zero magnetic field. While prior works have focused on ferromagnetic systems, little is known about its manipulation in antiferromagnets. Here, we report MnBi 2 Te 4 rare platform for realizing canted-antiferromagnetic (cAFM) with electrical control. We show the state...
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 crystals. For example, although graphene is inherently non-magnetic, recent work has reported a magnetic effect interfaced substrates, potentially enabling pathway towards achieving high-temperature quantum anomalous Hall effect. Here, we investigate heterostructures and chromium trihalide insulators (CrI$_3$,...
Introducing superconductivity in topological materials can lead to innovative electronic phases and device functionalities. Here, we present a unique strategy for quantum engineering of superconducting junctions moiré through direct, on-chip, fully encapsulated 2D crystal growth. We achieve robust designable Pd-metalized twisted bilayer molybdenum ditelluride (MoTe 2 ) observe anomalous effects high-quality across ~20 cells. Unexpectedly, the junction develops enhanced, instead weakened,...
The existence of a quantum critical point (QCP) and fluctuations around it are believed to be important for understanding the phase diagram in unconventional superconductors such as cuprates, iron pnictides, heavy fermion superconductors. However, QCP is usually buried deep within superconducting dome difficult investigate. connection between superconductivity remains an outstanding problem condensed matter. Here combining both electrical transport Nernst experiments, we explicitly...
The existence of a quantum critical point (QCP) and fluctuations around it are believed to be important for understanding the phase diagram in unconventional superconductors such as cuprates, iron pnictides, heavy fermion superconductors. However, QCP is usually buried deep within superconducting dome difficult investigate. connection between superconductivity remains an outstanding problem condensed matter. Here combining both electrical transport Nernst experiments, we explicitly...
The development of van der Waals (vdW) crystals and their heterostructures has created a fascinating platform for exploring optoelectronic properties in the two-dimensional (2D) limit. With recent discovery 2D magnets, control spin degree freedom can be integrated to realize spin-optoelectronics. Here, we report photovoltaic effects vdW magnet chromium triiodide (CrI3) sandwiched by graphene contacts. photocurrent displays distinct dependence on light helicity, which tuned varying magnetic...
Interacting electrons in one dimension (1D) are governed by the Luttinger liquid (LL) theory which excitations fractionalized. Can a LL-like state emerge 2D system as stable zero-temperature phase? This question is crucial study of non-Fermi liquids. A recent experiment identified twisted bilayer tungsten ditelluride (tWTe2) host physics at few kelvins. Here we report evidence for anisotropic LL down to 50 mK, spontaneously formed tWTe2 with twist angle ~ 3o. While metallic-like and nearly...
The intrinsic antiferromagnetic topological insulator $\mathrm{Mn}{\mathrm{Bi}}_{2}{\mathrm{Te}}_{4}$ undergoes a metamagnetic transition in $c$-axis magnetic field. It has been predicted that ferromagnetic is an ideal Weyl semimetal with single pair of nodes. Here we report measurements quantum oscillations detected the field-induced phase $\mathrm{Mn}{\mathrm{Bi}}_{2\ensuremath{-}x}{\mathrm{Sb}}_{x}{\mathrm{Te}}_{4}$, where Sb substitution tunes majority carriers from electrons to holes....
Two-dimensional (2D) transition metal dichalcogenides (TMDs) is a versatile class of quantum materials interest to various fields including, e.g., nanoelectronics, optical devices, and topological correlated matter. Tailoring the electronic properties TMDs essential their applications in many directions. Here, we report that highly controllable uniform on-chip 2D metallization process converts atomically thin into robust superconductors, property belonging none starting materials. As...