452 research outputs found
Inhomogeneity of donor doping in SrTiO3 substrates studied by fluorescence-lifetime imaging microscopy
Fluorescence-lifetime imaging microscopy (FLIM) was applied to investigate
the donor distribution in SrTiO3 single crystals. On the surfaces of Nb- and
La-doped SrTiO3, structures with different fluorescence intensities and
lifetimes were found that could be related to different concentrations of Ti3+.
Furthermore, the inhomogeneous distribution of donors caused a non-uniform
conductivity of the surface, which complicates the production of potential
electronic devices by the deposition of oxide thin films on top of doped single
crystals. Hence, we propose FLIM as a convenient technique (length scale: 1
m) for characterizing the quality of doped oxide surfaces, which could
help to identify appropriate substrate materials
Magnetic field dependence of antiferromagnetic resonance in NiO
We report on measurements of magnetic field and temperature dependence of antiferromagnetic resonances in the prototypical antiferromagnet NiO. The frequencies of the magnetic resonances in the vicinity of 1 THz have been determined in the time-domain via time-resolved Faraday measurements after selective excitation by narrow-band superradiant terahertz (THz) pulses at temperatures down to 3 K and in magnetic fields up to 10 T. The measurements reveal two antiferromagnetic resonance modes, which can be distinguished by their characteristic magnetic field dependencies. The nature of the two modes is discussed by comparison to an eight-sublattice antiferromagnetic model, which includes superexchange between the next-nearest-neighbor Ni spins, magnetic dipolar interactions, cubic magneto-crystalline anisotropy, and Zeeman interaction with the external magnetic field. Our study indicates that a two-sublattice model is insufficient for the description of spin dynamics in NiO, while the magnetic-dipolar interactions and magneto-crystalline anisotropy play important roles
Perturbative regime of terahertz high-harmonics generation in topological insulators
In this Letter, terahertz high harmonic generation processes in topological
insulators of the bismuth and antimony chalcogenides family are investigated.
Field conversion efficiencies are determined and clean cubic and quintic
power-law scaling is observed for third and fifth harmonics, up to driving
terahertz fields of 140 kV/cm. This is in contrast to all previous experiments
on terahertz harmonics generation in Dirac materials where a non-perturbative
regime has been observed already at few 10s kV/cm driving fields. Our nonlinear
THz spectroscopy experiments are complemented by THz pump - optical probe
measurements showing distinctly different relaxation dynamics of the carriers
in the topologically-protected Dirac states at the surfaces and the bulk. The
THz-induced dynamics of surface states reveal ultrafast relaxation that
prevents accumulation effects, and results in a clear perturbative regime of
THz harmonics generation that is different to graphene or Dirac semimetals with
their slower relaxation times in the few ps regime
Atropselective syntheses of (-) and (+) rugulotrosin A utilizing point-to-axial chirality transfer
Chiral, dimeric natural products containing complex structures and interesting biological properties have inspired chemists and biologists for decades. A seven-step total synthesis of the axially chiral, dimeric tetrahydroxanthone natural product rugulotrosin A is described. The synthesis employs a one-pot Suzuki coupling/dimerization to generate the requisite 2,2'-biaryl linkage. Highly selective point-to-axial chirality transfer was achieved using palladium catalysis with achiral phosphine ligands. Single X-ray crystal diffraction data were obtained to confirm both the atropisomeric configuration and absolute stereochemistry of rugulotrosin A. Computational studies are described to rationalize the atropselectivity observed in the key dimerization step. Comparison of the crude fungal extract with synthetic rugulotrosin A and its atropisomer verified that nature generates a single atropisomer of the natural product.P50 GM067041 - NIGMS NIH HHS; R01 GM099920 - NIGMS NIH HHS; GM-067041 - NIGMS NIH HHS; GM-099920 - NIGMS NIH HH
TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider
The TESLA Technical Design Report Part III: Physics at an e+e- Linear
ColliderComment: 192 pages, 131 figures. Some figures have reduced quality. Full
quality figures can be obtained from http://tesla.desy.de/tdr. Editors -
R.-D. Heuer, D.J. Miller, F. Richard, P.M. Zerwa
- …