A5021057831- Semiconductor materials and devices
- Semiconductor materials and interfaces
- Surface and Thin Film Phenomena
- Graphene research and applications
- DNA Repair Mechanisms
- Topological Materials and Phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Carbon Nanotubes in Composites
- 2D Materials and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Electronic and Structural Properties of Oxides
- Acoustic Wave Resonator Technologies
- Magnetic and transport properties of perovskites and related materials
- Force Microscopy Techniques and Applications
- Fungal and yeast genetics research
- DNA and Nucleic Acid Chemistry
- Semiconductor Quantum Structures and Devices
- Silicon Carbide Semiconductor Technologies
- Electronic Packaging and Soldering Technologies
- Physics of Superconductivity and Magnetism
- Copper Interconnects and Reliability
- Perovskite Materials and Applications
- GaN-based semiconductor devices and materials
- Silicon and Solar Cell Technologies
- Advanced Electron Microscopy Techniques and Applications
National Taiwan University
2009-2024
Institute of Physics, Academia Sinica
2009-2024
Academia Sinica
1995-2024
National Taiwan University of Science and Technology
2024
National Center for Theoretical Sciences
2018
University of Florida
2011
NTT Basic Research Laboratories
2010
Institute of Biological Chemistry, Academia Sinica
2004-2005
University of Chicago
2004
Harvard University Press
2004
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...
Topological surface states in PbTaSe 2 show fully gapped superconductivity, making it a potential topological superconductor.
Saccharomyces cerevisiae Hop2 and Mnd1 are abundant meiosisspecific chromosomal proteins, mutations in the corresponding genes lead to defects meiotic recombination homologous chromosome interactions during mid-prophase. Analysis of various double mutants suggests that HOP2 , MND1 DMC1 act same genetic pathway for establishment close juxtaposition between chromosomes. Biochemical studies indicate proteins form a stable heterodimer with higher affinity double-stranded than single-stranded...
One-step direct conversion of bulk MoO<sub>3</sub> to nanorods displayed significantly enhanced lithium-ion storage properties with higher reversible capacities.
A one-step process for the preparation of NbSe<sub>2</sub>nanostructures under effects mechanical forces to be used as Pt replacement CEs in DSSCs is reported.
We report a direct determination of the specular scattering probability acoustic phonons at crystal boundary by observing escape incident coherent from state during reflection. In sub-THz frequency range where phonon wavelength is much longer than lattice constant, phonon-interface interaction found to agree well with macroscopic theory on wave rough surfaces. This examination thus quantitatively verifies dominant role atomic-scale corrugations in Kapitza anomaly observed 1-10 K and further...
A spectroscopic imaging-scanning tunneling microscope (SI-STM) allows for the atomic scale visualization of surface electronic and magnetic structure novel quantum materials with a high energy resolution. To achieve optimal performance, low vibration facility is required. Here, we describe design performance an ultrahigh vacuum STM system supported by hybrid isolation that consists pneumatic passive piezoelectric active stage. We present detailed vibrational noise analysis system, which...
Dmc1 is specifically required for homologous recombination during meiosis. Here we report that the calcium ion enabled from budding yeast to form regular helical filaments on single-stranded DNA (ssDNA) and activate its strand assimilation activity. Relative magnesium, increased affinity of ATP but reduces DNA-dependent ATPase These effects, together with previous studies other RecA-like recombinases, support view binding protomers functional filament structure. The pitch Saccharomyces...
The RecA family of proteins mediates homologous recombination, an evolutionarily conserved pathway that maintains genomic stability by protecting against DNA double strand breaks. are thought to facilitate exchange reactions as closed-rings or right-handed helical filaments. Here, we report the crystal structure a left-handed Sulfolobus solfataricus RadA filament. Each protomer in this filament is linked its neighbour via interactions β-strand polymerization motif with neighbouring ATPase...
Temperature dependence of breakdown voltage in silicon abrupt p <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> -n junctions has been calculated using a modified Baraff theory [1]-[3] and measured experimentally from 77°K to 500°K, with substrate doping 10 xmlns:xlink="http://www.w3.org/1999/xlink">15</sup> cm xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> xmlns:xlink="http://www.w3.org/1999/xlink">18</sup> . Experimental data are...
We demonstrate that the Raman intensities of G and 2D bands a suspended graphene can be enhanced using gold tip with an apex size 2.3 μm. The enhancement decays tip-graphene distance exponentially remains detectable at 1.5 mappings show area is comparable to size. Application bias voltage attract so signals are intensified. exponential enhancement-distance relationship enables measurement deformation, Young's modulus estimated 1.48 TPa.
Dirac nodal line semimetals represent a new state of quantum matters in which the electronic bands touch to form closed loop with linear dispersion. Here, we report combined study on ZrSiS by density functional theory calculation, scanning tunneling microscope (STM) and magneto-transport measurements. Our STM measurements reveal spectroscopic signatures diamond-shaped bulk band surface two types cleaved surfaces as well spin polarized at ${\bar{\Gamma}}$ E~0.6eV S-surface, consistent our...
Saccharomyces cerevisiae Dmc1, a meiosis-specific homologue of RecA, catalyzes homologous pairing and strand exchange during meiotic DNA recombination. The purified budding yeast Dmc1 (ScDmc1) protein exhibits much weaker recombinase activity in vitro as compared to that the Escherichia coli RecA protein. Using atomic force microscopy (AFM) with carbon nanotube tips, we found ScDmc1 forms rings an external diameter 18 nm central cavity 4 nm. In presence single-stranded (ssDNA), majority...
RecA family proteins, including bacterial RecA, archaeal RadA, and eukaryotic Dmc1 Rad51, mediate homologous recombination, a reaction essential for maintaining genome integrity. In the presence of ATP, these proteins bind single-strand DNA to form right-handed nucleoprotein filament, which catalyzes pairing strand exchange with double-stranded (dsDNA), by as-yet unknown mechanisms. We recently reported structure RadA left-handed helical here present three new structures filaments....
The ionization rates of electrons and holes in Ge have been measured from 200 to 300°K were fit the Baraff theory, which optical-phonon mean free path is verified be temperature dependent fits formula λ=λ0 tanh(Ep/2KT), where Ep average energy. asymptotic paths deduced experiments are λ0e=76 Å λ0h=84 for holes, respectively, good agreement with Miller's data obtained at room temperature. A simplified approach calculate photomultiplication has also one-sided abrupt junction.
Metal-oxygen bonding of the Ce-doped LaCoO3 system remains largely unexplored despite extensive studies on its magnetic properties. Here, we investigate structure and local nanoscale La1−xCexCoO3, with x = 0, 0.2, 0.4, using Rietveld refinement synchrotron X-ray absorption techniques, complemented by topological analysis experimental electron density energy distribution. The results show that subject to Ce addition is best interpretable a model cubic symmetry in contrast pristine LaCoO3,...
Glide-mirror symmetry in nonsymmorphic crystals can foster the emergence of novel hourglass nodal loop states. Here, we present spectroscopic signatures from angle-resolved photoemission a predicted topological semimetal phase Nb3SiTe6. Linear band crossings are observed at zone boundary Nb3SiTe6, which could be origin nontrivial Berry and consistent with glide quantum spin Hall effect; such linear connect to form loop. Furthermore, saddle-like Fermi surface Nb3SiTe6 our results helps unveil...
The ultrafast variation of optical bandgap, due to the presence photocarriers, was investigated in exfoliated InSe. thickness and surface condition play an important role carrier lifetime.
We report a method of fabricating ultra-clean and hysteresis-free multiwall carbon nanotube field-effect transistors (CNFETs) inside the ultra-high vacuum transmission electron microscope equipped with movable gold tip as local gate. By tailoring shell structure varying drain-source voltage (Vds), we can tune electronic characteristic CNFET in situ. have also found that Schottky barriers are generated within nanotube, but not at nanotube/electrode contacts, barrier height has been derived....