A5086074604- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Graphene research and applications
- Physics of Superconductivity and Magnetism
- Electronic and Structural Properties of Oxides
- Advanced Drug Delivery Systems
- Semiconductor materials and devices
- Quantum and electron transport phenomena
- Magnetic properties of thin films
- Advanced Thermoelectric Materials and Devices
- 2D Materials and Applications
- Nanoparticle-Based Drug Delivery
- Drug Solubulity and Delivery Systems
- Acne and Rosacea Treatments and Effects
- Particle accelerators and beam dynamics
- Polymer Surface Interaction Studies
- Skin Protection and Aging
- Innovative Microfluidic and Catalytic Techniques Innovation
- Multiferroics and related materials
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Iron-based superconductors research
- Advanced Semiconductor Detectors and Materials
- Thermal properties of materials
Institute of Physics, Academia Sinica
2015-2024
SUNY Downstate Health Sciences University
1978-2024
Columbia University
1975-2024
National Taiwan University
2015-2019
National Yang Ming Chiao Tung University
2017
Nanyang Technological University
2009-2016
Princeton Plasma Physics Laboratory
2006-2015
Academia Sinica
2011-2014
Agency for Science, Technology and Research
2009
Institute of Chemical and Engineering Sciences
2009
We investigate the quantum anomalous Hall Effect (QAHE) and related chiral transport in millimeter-size (Cr0.12Bi0.26Sb0.62)2Te3 films. With high sample quality robust magnetism at low temperatures, quantized conductance of e2/h is found to persist even when film thickness beyond two-dimensional (2D) hybridization limit. Meanwhile, Chern insulator-featured edge conduction manifested by non-local measurements. In contrast 2D hybridized thin film, an additional weakly field-dependent...
In a ferromagnet, an applied electric field E invariably produces anomalous Hall current J H that flows perpendicular to the plane defined by and M (the magnetization). For decades, question of whether is dissipationless (independent scattering rate) has been debated without experimental resolution. ferromagnetic spinel CuCr 2 Se 4– x Br , resistivity ρ (at low temperature) may be increased several decades varying (Br) degrading M. We show /E (normalized per carrier, at 5 kelvin) remains...
We demonstrate a polymer-free method that can routinely transfer relatively large-area graphene to any substrate with advanced electrical properties and superior atomic chemical structures as compared the sheets transferred conventional polymer-assisted methods. The films are show high conductance excellent optical transmittance. Raman spectroscopy X-ray/ultraviolet photoelectron also confirm presence of quality little contamination after transfer. Atom-resolved images be obtained using...
Abstract After decades of searching for the dissipationless transport in absence any external magnetic field, quantum anomalous Hall effect (QAHE) was recently achieved topological insulator films. However, universal phase diagram QAHE and its relation with (QHE) remain to be investigated. Here, we report experimental observation giant longitudinal resistance peak zero conductance plateau at coercive field six quintuple-layer (Cr 0.12 Bi 0.26 Sb 0.62 ) 2 Te 3 film, demonstrate...
Low-dimensional materials could display anomalous thermal conduction that the conductivity (κ) diverges with increasing lengths, in ways inconceivable any bulk materials. However, previous theoretical or experimental investigations were plagued many finite-size effects, rendering results either indirect inconclusive. Indeed, on must demand sample length to be sufficiently long so phenomena emerge from unwanted effects. Here we report observations κ's of single-wall carbon nanotubes...
In a ferromagnet, an anomalous Hall heat current, given by the off-diagonal Peltier term alpha(xy), accompanies current. By combining Nernst, thermopower, and experiments, we have measured how alpha(xy) varies with hole density lifetime tau in CuCr2Se4-xBrx. At low temperatures T, find that is independent of tau, consistent anomalous-velocity theories. Its magnitude fixed microscopic geometric area A approximately 34 A(2). Our results are incompatible some models Nernst effect ferromagnets.
Summary Antibiotic resistance of the resident cutaneous bacterial flora is a well recognized consequence systemic antibiotic therapy. In this study, we followed development coagulase-negative staphylococci (CNS), most numerous aerobic bacteria found on skin surface, during treatment with three topical antimicrobial agents used to treat acne vulgaris. Groups 20 subjects received either erythromycin, benzoyl peroxide or combination two for 16 weeks. After 12 weeks was dominated by S....
The thermoelectric power of a material, typically governed by its band structure and carrier density, can be varied chemical doping that is often restricted solubility the dopant. Materials showing large are useful for many industrial applications, such as heat-to-electricity conversion cooling device. Here we show full electric-field tuning in dual-gated bilayer graphene device resulting from opening gap applying perpendicular electric field on graphene. We uncover enhancement at low...
The serotonergic transmitter system plays fundamental roles in the nervous neurotransmission, synaptic plasticity, pathological processes, and therapeutic effects of antidepressants psychedelics, as well gastrointestinal circulatory systems. We introduce a novel small molecule fluorescent agent, termed SERTlight, that specifically labels neuronal cell bodies, dendrites, axonal projections serotonin transporter (SERT) substrate. SERTlight was developed by an iterative molecular design...
This paper reports the formation of two-dimensional electron gas (2DEG) in rf-sputtered defective polycrystalline MgZnO/ZnO heterostructure via screening grain boundary potential by polarization-induced charges. As MgZnO thickness increases, sheet resistance reduces rapidly and then saturates. The enhancement interfacial polarization effect becomes stronger, corresponding to a larger amount reduction, when Mg content cap layer increases. Monte Carlo method including scattering as well 2D...
A new type of polymer-assisted self-assembly nanospheres at a water-air interface was uncovered. By adding merely 1-3 ppm polyethylene oxide in the water, polystyrene nanospheres, applicable to diameters ranging from 100 nm 1 μm, were found gradually move closer each other and eventually form close-packed structure confirmed its diffraction pattern. As it turns out, oxides are adsorbed onto surface giving rise effective screening coulomb repulsive force between followed by onset...
We studied the defects of Bi2Se3 generated from Bridgman growth stoichiometric and nonstoichiometric self-fluxes. Growth habit, lattice size, transport properties are strongly affected by types defect generated. Major Bi_Se antisite partial Bi_2-layer intercalation identified through combined studies direct atomic-scale imaging with scanning transmission electron microscopy (STEM) in conjunction energy-dispersive X-ray spectroscopy (STEM-EDX), diffraction, Hall effect measurements. propose a...
Large size (∼2 cm) single crystals of layered MoTe2 in both 2H- and 1T′-types were synthsized using TeBr4 as the source Br2 transport agent chemical vapor growth. The crystal structures as-grown fully characterized by X-ray diffraction, Raman spectroscopy, scanning transmission electron microscopy, tunneling microscopy (STM), electrical resistivity (ρ) measurements. ρ(T), magnetic susceptibility χ(T), heat capacity Cp(T) measurement results reveal a first order structural phase transition...
Current focus on particulate drug delivery entails the need for increased loading and sustained release of water soluble drugs. Commonly studied biodegradable polyesters, such as poly(lactide-co-glycolide) (PLGA) poly(L-lactide) (PLLA), are lacking in terms efficiency these drugs a stable encapsulation environment proteins. While hydrogels could enable higher hydrophilic drugs, they limited controlled release. With this mind, aim was to develop microparticles with drug-loaded hydrogel core...
Abstract In a thin Weyl semimetal, thickness dependent Weyl-orbit quantum oscillation was proposed to exist, originating from nonlocal cyclotron orbit via electron tunnelings between top and bottom Fermi-arc surface states. Here, magneto-transport measurements were carried out on untwinned metal SrRuO 3 films. particular, oscillations with frequency F s1 ≈ 30 T identified, corresponding small Fermi pocket light effective mass. Its amplitude appears be at maximum for thicknesses in range of...
Abstract The three dimensional (3D) Dirac semimetal is a new quantum state of matter that has attracted much attention recently in physics and material science. Here, we report on the growth large plate-like single crystals Cd 3 As 2 two major orientations by self-selecting vapor (SSVG) method optimum conditions have been experimentally determined. crystalline imperfections electrical properties were examined with transmission electron microscopy (TEM), scanning tunneling (STM) transport...
Particulate systems have tremendous potential to achieve controlled release and targeted delivery of drugs. However, conventional single-layered particles several inherent limitations, including initial burst release, the inability provide zero-order a lack time-delayed or pulsatile therapeutic agents. Multilayered overcome these disadvantages. Herein, it is shown how triple-layered polymeric microparticles can be fabricated through simple, economical, reliable, versatile one-step solvent...
We report crystal growth, AC and DC magnetic susceptibilities [χ(T, H)], magnetization [M(T, heat capacity [CP(T, H)] measurement results of GdSbTe single crystal. is isostructural to the confirmed nonmagnetic nodal-line semimetal ZrSiS noncentrosymmetric tetragonal structure in space group P4/nmm (No. 129), but it shows additional long-range antiferromagnetic spin ordering for Gd spins S = 7/2 below TN. Both χ(T, H) CP(T, measurements confirm existence a (AFM) TN ∼ 12 K, an...