A5021151831- Topological Materials and Phenomena
- 2D Materials and Applications
- Graphene research and applications
- Iron-based superconductors research
- Crystallization and Solubility Studies
- Rare-earth and actinide compounds
- X-ray Diffraction in Crystallography
- Advanced Condensed Matter Physics
- Inorganic Chemistry and Materials
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Crystal Structures and Properties
- Heusler alloys: electronic and magnetic properties
- Organic and Molecular Conductors Research
- MXene and MAX Phase Materials
- Advanced Thermoelectric Materials and Devices
- Perovskite Materials and Applications
- Magnetic properties of thin films
- Machine Learning in Materials Science
- Solid-state spectroscopy and crystallography
- Semiconductor Quantum Structures and Devices
- Advancements in Battery Materials
- Superconducting Materials and Applications
Princeton University
2016-2025
Rice University
2022
Max Planck Institute for Solid State Research
2016-2019
Princeton Public Schools
2018
Stuttgart Observatory
2016
Max Planck Society
2012-2016
Johns Hopkins University
2015
Max Planck Institute for Chemical Physics of Solids
2012-2014
University of Applied Sciences Mainz
2011-2013
Johannes Gutenberg University Mainz
2009-2012
Abstract Materials harbouring exotic quasiparticles, such as massless Dirac and Weyl fermions, have garnered much attention from physics material science communities due to their exceptional physical properties ultra-high mobility extremely large magnetoresistances. Here, we show that the highly stable, non-toxic earth-abundant material, ZrSiS, has an electronic band structure hosts several cones form a Fermi surface with diamond-shaped line of nodes. We also square Si lattice in ZrSiS is...
We report the synthesis and crystal structure of a new high-temperature form Ca3P2. The was determined through Rietveld refinements synchrotron powder x-ray diffraction data. This Ca3P2 has hexagonal Mn5Si3 type, with Ca ion deficiency compared to ideal 5:3 stoichiometry. yields stable, charge-balanced compound Ca2+ P3−. also observation secondary hydride phase, Ca5P3H, which again is compound. calculated band indicates that it three-dimensional Dirac semimetal highly unusual ring nodes at...
Design principles and novel predictions of new 3D Dirac semimetals are presented, along with the context currently known materials. Current materials include those based on a topological to trivial phase transition, such as in TlBiSe$_{2-x}$S$_x$ Hg$_{1-x}$Cd$_x$Te, Bi$_{1-x}$Sb$_x$, Bi$_{2-x}$In$_x$Se$_3$, Pb$_{1-x}$Sn$_x$Se. Some more recently revealed materials, Na$_3$Bi Cd$_3$As$_2$, their native composition. The different design presented each yield for candidates. For Case I, charge...
Abstract The fabrication of highly active and robust hexagonal ruthenium oxide nanosheets for the electrocatalytic oxygen evolution reaction (OER) in an acidic environment is reported. ruthenate exhibit best OER activity all solution‐processed acid medium electrocatalysts reported to date, reaching 10 mA cm −2 at overpotential only ≈255 mV. also demonstrate robustness under harsh oxidizing conditions. Theoretical calculations give insights into mechanism reveal that edges are origin high...
Dirac and Weyl semimetals both exhibit arc-like surface states. However, whereas the Fermi arcs in are topological consequences of points themselves, not directly related to bulk points, raising question whether there exists a bulk-boundary correspondence for semimetals. In this work, we discover that strong fragile 1D higher-order hinge (HOFAs) as universal, direct their 3D points. To predict HOFAs coexisting with states solid-state semimetals, introduce layer spinful model an...
An unusual angle-dependent topological phase transition and butterfly magnetoresistance were found in the Dirac semimetal ZrSiS.
Initiated by the discovery of topological insulators, topologically non-trivial materials have attracted immense interest in physics community past decade. One latest additions to field, material class semimetals, has grown at an extremely fast rate . While prototype a semimetal, graphene, been known for while, first 3D analogues graphene only discovered recently. This review, written from chemistry perspective, intends make growing field semimetals accessible wider scientists and scholars...
Materials discovery lays the foundation for many technological advancements. The prediction and of new materials are not simple tasks. Here, we outline some basic principles solid-state chemistry, which might help to advance both, discuss pitfalls challenges in discovery. Using recent work Szymanski [Nature 624, 86 (2023)], reported autonomous 43 novel materials, as an example, problems that can arise unsupervised hope by addressing these, be brought closer reality. We all synthetic products...
Cr2Ge2Te6 is proposed as an insulating ferromagnetic substrate for the growth of tetradymite-type topological insulators, based on a refined characterization its transport, magnetic, optical, and calculated electronic properties. It found to be soft ferromagnet with no visible magnetic domains over relatively large length scales highly indirect band gap low carrier concentration. Further we present fabrication Bi2Te3-Cr2Ge2Te6 heterostructure samples by chemical vapor deposition show that...
Topological Dirac semimetals (TDSs) represent a new state of quantum matter recently discovered that offers platform for realizing many exotic physical phenomena. A TDS is characterized by the linear touching bulk (conduction and valance) bands at discrete points in momentum space (i.e. 3D points), such as Na3Bi Cd3As2. More recently, types with robust line-nodes (with non-trivial topology or near critical point between topological phase transitions) have been proposed extends from to 1D...
By establishing magnetic order in a square lattice compound, we introduce the first “new fermion.”
Van der Waals (vdW) materials with magnetic order have been heavily pursued for fundamental physics as well device design. Despite the rapid advances, so far, they are mainly insulating or semiconducting, and none of them has a high electronic mobility-a property that is rare in layered vdW general. The realization high-mobility material also exhibits would open possibility novel twistronic spintronic devices. Here, we report very carrier mobility antiferromagnet GdTe3. electron beyond...
High-quality single crystals of WTe2 were grown using a Te flux followed by cleaning step involving self-vapor transport. The method is reproducible and yields consistently higher-quality than are typically obtained via halide-assisted vapor transport methods. Magnetoresistance (MR) values at 9 tesla 2 kelvin as high 1.75 million %, nearly an order magnitude higher previously reported for this material, on with residual resistivity ratio (RRR) approximately 1250. MR follows near B law and,...
Non-symmorphic materials have recently been predicted to exhibit many different exotic features in their electronic structures. These originate from forced band degeneracies caused by the non-symmorphic symmetry, which not only creates possibility realize Dirac semimetals, but also resulted prediction of novel quasiparticles beyond usual Dirac, Weyl or Majorana fermions, can exist solid state. Experimental realization that Fermi level located at degenerate point is difficult, however, due...
Using inelastic neutron scattering, we map a 14 meV coherent resonant mode in the topological Kondo insulator ${\mathrm{SmB}}_{6}$ and describe its relation to low energy insulating band structure. The intensity is confined $X$ $R$ high symmetry points, repeating outside first Brillouin zone dispersing less than 2 meV, with $5d$-like magnetic form factor. We present slave-boson treatment of Anderson Hamiltonian third neighbor dominated hybridized This approach produces spin exciton below...
Spin $\frac{1}{2}$ honeycomb materials have gained substantial interest due to their exotic magnetism and possible application in quantum computing. However, all current out-of-plane interactions are interfering with the in-plane order, hence a true 2D magnetic system is still of demand. Here, we report exfoliation semiconductor $\alpha$-RuCl$_3$ into first halide monolayers characterization spin arrangement turbostratically stacked RuCl$_3$ monolayers. The based on reductive...
Compounds featuring a kagome lattice are studied for wide range of properties, from localized magnetism to massless and massive Dirac Fermions. These properties come the symmetry lattice, which gives rise cones flat bands. However, not all compounds with sublattice show related it. We derive chemical rules predicting if low-energy physics material is determined by bands arising After sorting out known crystals into four groups, we use heuristics local explain additional conditions that need...