39 research outputs found
Nonlinear evolution of surface morphology in InAs/AlAs superlattices via surface diffusion
Continuum simulations of self-organized lateral compositional modulation
growth in InAs/AlAs short-period superlattices on InP substrate are presented.
Results of the simulations correspond quantitatively to the results of
synchrotron x-ray diffraction experiments. The time evolution of the
compositional modulation during epitaxial growth can be explained only
including a nonlinear dependence of the elastic energy of the growing epitaxial
layer on its thickness. From the fit of the experimental data to the growth
simulations we have determined the parameters of this nonlinear dependence. It
was found that the modulation amplitude don't depend on the values of the
surface diffusion constants of particular elements.Comment: 4 pages, 3 figures, published in Phys. Rev. Lett.
http://link.aps.org/abstract/PRL/v96/e13610
Surface morphology and magnetic anisotropy in (Ga,Mn)As
Atomic Force Microscopy and Grazing incidence X-ray diffraction measurements
have revealed the presence of ripples aligned along the direction
on the surface of (Ga,Mn)As layers grown on GaAs(001) substrates and buffer
layers, with periodicity of about 50 nm in all samples that have been studied.
These samples show the strong symmetry breaking uniaxial magnetic anisotropy
normally observed in such materials. We observe a clear correlation between the
amplitude of the surface ripples and the strength of the uniaxial magnetic
anisotropy component suggesting that these ripples might be the source of such
anisotropy.Comment: 3 pages, 4 figures, 1 table. Replaced with published versio
Effect of Strain on the Growth of InAs/GaSb Superlattices: An X-Ray Study
We present a detailed x-ray diffraction study of the strain in InAs/GaSb
superlattices grown by molecular beam epitaxy. The superlattices were grown
with either InSb or GaAs interfaces. We show that the superlattice morphology,
either planar or nanostructured, is dependent on the chemical bonds at the
heterointerfaces. In both cases, the misfit strain has been determined for the
superlattice layers and the interfaces. We also determined how the magnitude
and sign of this strain is crucial in governing the morphology of the
superlattice. Our analysis suggests that the growth of self-assembled
nanostructures may be extended to many systems generally thought to have too
small a lattice mismatch.Comment: 40 pages, 14 figures, 2 tables. Submitted to Journal of Applied
Physics in November 200
Non-uniform carrier density in CdAs evidenced by optical spectroscopy
We report the detailed optical properties of CdAs crystals in a wide
parameter space: temperature, magnetic field, carrier concentration and crystal
orientation. We investigate high-quality crystals synthesized by three
different techniques. In all the studied samples, independently of how they
were prepared and how they were treated before the optical experiments, our
data indicate conspicuous fluctuations in the carrier density (up to 30%).
These charge puddles have a characteristic scale of 100 m, they become
more pronounced at low temperatures, and possibly, they become enhanced by the
presence of crystal twinning. The Drude response is characterized by very small
scattering rates ( meV) for as-grown samples. Mechanical treatment,
such as cutting or polishing, influences the optical properties of single
crystals, by increasing the Drude scattering rate and also modifying the high
frequency optical response. Magneto-reflectivity and Kerr rotation are
consistent with electron-like charge carriers and a spatially non-uniform
carrier density.Comment: Accepted in Physical Review
Magneto-optical signature of massless Kane electrons in Cd3As2
We report on optical reflectivity experiments performed on Cd3As2 over a
broad range of photon energies and magnetic fields. The observed response
clearly indicates the presence of 3D massless charge carriers. The specific
cyclotron resonance absorption in the quantum limit implies that we are probing
massless Kane electrons rather than symmetry-protected 3D Dirac particles. The
latter may appear at a smaller energy scale and are not directly observed in
our infrared experiments.Comment: 5 pages, 4 figures + supplementary materials (17 pages), to be
published in Phys. Rev. Let
Landau level spectroscopy of BiTe
Here we report on Landau level spectroscopy in magnetic fields up to 34 T
performed on a thin film of topological insulator BiTe epitaxially
grown on a BaF substrate. The observed response is consistent with the
picture of a direct-gap semiconductor in which charge carriers closely resemble
massive Dirac particles. The fundamental band gap reaches ~meV
at low temperatures and it is not located on the trigonal axis, thus displaying
either six or twelvefold valley degeneracy. Notably, our magneto-optical data
do not indicate any band inversion. This suggests that the fundamental band gap
is relatively distant from the point where profound inversion exists
andgives rise to relativistic-like surface states of BiTe.Comment: 12 pages, 11 figures, to be published in Phys. Rev.
Interband absorption edge in the topological insulators Bi-2(Te1-xSex)(3)
We have investigated the optical properties of thin films of topological insulators Bi2Te3, Bi2Se3, and their alloys Bi-2(Te1-x Se-x)(3) on BaF2 substrates by a combination of infrared ellipsometry and reflectivity in the energy range from 0.06 to 6.5 eV. For the onset of interband absorption in Bi2Se3, after the correction for the Burstein-Moss effect, we find the value of the direct band gap of 215 +/- 10 meV at 10 K. Our data support the picture that Bi2Se3 has a direct band gap located at the Gamma point in the Brillouin zone and that the valence band reaches up to the Dirac point and has the shape of a downward-oriented paraboloid, i.e., without a camel-back structure. In Bi2Te3, the onset of strong direct interband absorption at 10 K is at a similar energy of about 200 meV, with a weaker additional feature at about 170 meV. Our data support the recent GW band-structure calculations suggesting that the direct interband transition does not occur at the Gamma point but near the Z-F line of the Brillouin zone. In the Bi-2(Te1-x Se-x)(3) alloy, the energy of the onset of direct interband transitions exhibits a maximum near x = 0.3 (i.e., the composition of Bi2Te2Se), suggesting that the crossover of the direct interband transitions between the two points in the Brillouin zone occurs close to this composition
The fine structure of the comparative
The paper provides evidence for a more articulated structure of the comparative as compared with the one in Bobaljik (2012). We propose to split up Bobaljik's cmpr head into two distinct heads, C1 and C2. Looking at Czech, Old Church Slavonic and English, we show that this proposal explains a range of facts about suppletion and allomorphy. A crucial ingredient of our analysis is the claim that adjectival roots are not a-categorial, but spell out adjectival functional structure. Specifically, we argue that adjectival roots come in various types, differing in the amount of functional structure they spell out. In order to correctly model the competition between roots, we further introduce a Faithfulness Restriction on Cyclic Override, which allows us to dispense with the Elsewhere Principle
Nonmagnetic band gap at the Dirac point of the magnetic topological insulator Bi1 xMnx 2 Se3
Magnetic doping is expected to open a band gap at the Dirac point of
topological insulators by breaking time-reversal symmetry and to enable novel
topological phases. Epitaxial (BiMn)Se is a
prototypical magnetic topological insulator with a pronounced surface band gap
of meV. We show that this gap is neither due to ferromagnetic order
in the bulk or at the surface nor to the local magnetic moment of the Mn,
making the system unsuitable for realizing the novel phases. We further show
that Mn doping does not affect the inverted bulk band gap and the system
remains topologically nontrivial. We suggest that strong resonant scattering
processes cause the gap at the Dirac point and support this by the observation
of in-gap states using resonant photoemission. Our findings establish a novel
mechanism for gap opening in topological surface states which challenges the
currently known conditions for topological protection.Comment: 26 pages, 7 figure