5,015 research outputs found
Secretory Carcinoma: A Silent Mass Increasing in the Parotid Gland
BACKGROUND: Secretory carcinoma (SC) of the salivary gland, also known as mammary analog secretory carcinoma, is a rare tumor in the parotid gland. This kind of tumor is characterized by generally indolent clinical behavior and expression of a break in the ETV6 gene.
CASE REPORT: We present a unique case of secretory carcinoma and show its favorable prognoses.
CONCLUSION: Secretory carcinoma of the salivary gland is a low-grade carcinoma with a favorable prognosis. It has low regional lymph node and distant metastasis potential. Due to the possibility of misdiagnosis, immunohistochemical studies and FISH are suggested. The most effective treatment is complete surgical excision with negative surgical margins
Spin chain in magnetic field: limitations of the large-N mean-field theory
Motivated by the recent success in describing the spin and orbital spectrum
of a spin-orbital chain using a large-N mean-field approximation [Phys. Rev. B
91, 165102 (2015)], we apply the same formalism to the case of a spin chain in
the external magnetic field. It occurs that in this case, which corresponds to
N=2 in the approximation, the large-N mean-field theory cannot qualitatively
reproduce the spin excitation spectra at high magnetic fields, which polarize
more than 50% of the spins in the magnetic ground state. This, rather
counterintuitively, shows that the physics of a spin chain can under some
circumstances be regarded as more complex than the physics of a spin-orbital
chain.Comment: 4 pages, 3 figures; appeared in the proceedings of the European
Conference "Physics of Magnetism" (2014
Fluctuating Nature of Light-Enhanced -Wave Superconductivity: A Time-Dependent Variational Non-Gaussian Exact Diagonalization Study
Engineering quantum phases using light is a novel route to designing
functional materials, where light-induced superconductivity is a successful
example. Although this phenomenon has been realized experimentally, especially
for the high- cuprates, the underlying mechanism remains mysterious. Using
the recently developed variational non-Gaussian exact diagonalization method,
we investigate a particular type of photoenhanced superconductivity by
suppressing a competing charge order in a strongly correlated electron-electron
and electron-phonon system. We find that the -wave superconductivity pairing
correlation can be enhanced by a pulsed laser, consistent with recent
experiments based on gap characterizations. However, we also find that the
pairing correlation length is heavily suppressed by the pump pulse, indicating
that light-enhanced superconductivity may be of fluctuating nature. Our
findings also imply a general behavior of nonequilibrium states with competing
orders, beyond the description of a mean-field framework.Comment: 17 pages, 8 figure
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