A5030611363- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Iron-based superconductors research
- Rare-earth and actinide compounds
- Graphene research and applications
- Multiferroics and related materials
- 2D Materials and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Superconductivity in MgB2 and Alloys
- Inorganic Chemistry and Materials
- Electronic and Structural Properties of Oxides
- Crystal Structures and Properties
- Quantum and electron transport phenomena
- Nuclear materials and radiation effects
- Advanced Thermoelectric Materials and Devices
- Boron and Carbon Nanomaterials Research
- High-pressure geophysics and materials
- Thermal Expansion and Ionic Conductivity
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Magnetic Properties of Alloys
- Organic and Molecular Conductors Research
Princeton University
2016-2025
Rice University
2022
Princeton Public Schools
2001-2021
Universidad de Extremadura
2020-2021
University of Toronto
2017
Gdańsk University of Technology
2005-2016
University of Washington
2013
Technical University of Denmark
2011-2012
École Centrale Paris
2012
Centre National de la Recherche Scientifique
1990-2012
We have prepared and identified as a single phase the high-temperature superconducting compound in chemical system Y-Ba-Cu-O, an orthorhombic, distorted oxygen-deficient perovskite of stoichiometry ${\mathrm{Ba}}_{2}$${\mathrm{YCu}}_{3}$${\mathrm{O}}_{9\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ (\ensuremath{\delta}\ensuremath{\simeq}2.1). Samples exhibit zero resistance at 91 K, with transition width 1.5 K. The Meissner effect attains value 76% independently measured diamagnetic...
A topologically ordered material is characterized by a rare quantum organization of electrons that evades the conventional spontaneously broken symmetry–based classification condensed matter. Exotic spin-transport phenomena, such as dissipationless spin Hall effect, have been speculated to originate from topological order whose identification requires spin-sensitive measurement, which does not exist this date in any system. Using Mott polarimetry, we probed degrees freedom and demonstrated...
In quantum field theory, we learn that fermions come in three varieties: Majorana, Weyl, and Dirac. Here show solid state systems this classification is incomplete find several additional types of crystal symmetry-protected free fermionic excitations . We exhaustively classify linear quadratic 3-, 6- 8- band crossings stabilized by space group symmetries with spin-orbit coupling time-reversal symmetry. Several distinct arise, differentiated their degeneracies at along high symmetry points,...
We report the direct observation of three-dimensional (3D) Dirac semimetal phase in cadmium arsenide (Cd(3)As(2)) by means angle-resolved photoemission spectroscopy. identify two momentum regions where electronic states that strongly disperse all directions form narrow conelike structures, and thus prove existence long sought 3D points. This structure naturally explains why Cd(3)As(2) has one highest known bulk electron mobilities. realization a not only opens path to wide spectrum...
Breaking chiral symmetry in a solid Dirac semimetals have graphene-like electronic structure, albeit three rather than two dimensions. In magnetic field, their cones split into halves, one supporting left-handed and the other right-handed fermions. If an electric field is applied parallel to this “chiral” may break: phenomenon called anomaly. Xiong et al. observed anomaly semimetal Na 3 Bi (see Perspective by Burkov). Transport measurements lead detection of predicted large negative...
We report the results of resistivity and magnetic susceptibility measurements in ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Sr}}_{\mathrm{x}}$${\mathrm{CuO}}_{4}$ for x\ensuremath{\le}0.3. The x=0.2 sample shows a superconducting transition at 36.2 K with width 1.4 K. associated dc diamagnetic (Meissner effect) is large fraction (60%--70%) ideal value. estimate density states from critical-field data suggest, by analogy to...
Bi2Se3 is one of a handful known topological insulators. Here we show that copper intercalation in the van der Waals gaps between layers, yielding an electron concentration approximately 2x10{20} cm{-3}, results superconductivity at 3.8 K CuxBi2Se3 for 0.12<or=x<or=0.15. This demonstrates Cooper pairing possible accessible temperatures, with implications studying physics insulators and potential devices.
We show that the strongly spin-orbit coupled materials Bi2Te3 and Sb2Te3 their derivatives belong to Z2 topological-insulator class. Using a combination of first-principles theoretical calculations photoemission spectroscopy, we directly is large spin-orbit-induced indirect bulk band gap (delta approximately 150 meV) semiconductor whose surface characterized by single topological spin-Dirac cone. The electronic structure self-doped exhibits similar properties. demonstrate dynamics fermions...
Employing a gettered annealing technique, we have prepared homogeneous polycrystalline samples of oxygen-deficient ${\mathrm{Ba}}_{2}\mathrm{Y}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ for $0\ensuremath{\le}\ensuremath{\delta}\ensuremath{\le}0.7$. Measurements resistive ${T}_{c}$, resistivity, magnetization, and lattice parameter indicate that distinct bulk superconducting phase with ${T}_{c}$ 60 K occurs in the range $0.3<\ensuremath{\delta}<0.4$. This displays...
Topological insulators are insulating materials that display massless, Dirac-like surface states in which the electrons have only one spin degree of freedom on each surface. These been imaged by photoemission, but little information their transport parameters, for example, mobility, is available. We report observation Shubnikov-de Haas oscillations arising from nonmetallic crystals Bi(2)Te(3). In addition, we uncovered a Hall anomaly weak fields, enables current to be seen directly. Both...
Abstract Transition metal dichalcogenides have attracted research interest over the last few decades due to their interesting structural chemistry, unusual electronic properties, rich intercalation chemistry and wide spectrum of potential applications. Despite fact that majority related focuses on semiconducting transition-metal (for example, MoS 2 ), recently discovered unexpected properties WTe are provoking strong in semimetallic transition featuring large magnetoresistance,...