Results 81 to 90 of about 300,638 (255)

Lifshitz Transition in Correlated Topological Semimetals

Advanced Science, EarlyView.
Theoretical calculations reveal that in YPtBi and GdPtBi, strong electronic correlations shift topological Dirac nodes away from the Fermi level by forming large hole pockets. This effect is sensitive to temperature and arises from interactions among 4d or 4f electrons, offering insights into Fermi surface engineering in quantum materials.
Byungkyun Kang, Myoung‐Hwan Kim, Chul Hong Park, Anderson Janotti, Eunja Kim   +4 more
wiley   +1 more source

The 100 pc White Dwarf Sample in the SDSS Footprint. II. A New Look at the Spectral Evolution of White Dwarfs

The Astrophysical Journal
We increase the spectroscopic completeness of the 100 pc white dwarf sample in the Sloan Digital Sky Survey footprint with 840 additional spectra. Our spectroscopy is 86% complete for white dwarfs hotter than T _eff  = 5000 K, where H α remains visible ...
Mukremin Kilic, Pierre Bergeron, Simon Blouin, Adam Moss, Warren R. Brown, Antoine Bédard, Gracyn Jewett, Marcel A. Agüeros   +7 more
doaj   +1 more source

EXERCÍCIOS ENVOLVENDO A MAGNITUDE LIMITE NO ENSINO DE ASTRONOMIA: EXERCISES COMPREHENDING THE LIMIT MAGNITUDE IN ASTRONOMY TEACHING

, 2010
Neste trabalho são apresentados alguns exercícios e atividades, elaborados para disciplinas de Astronomia Básica e inspirados na propos ta de exploração multicontextual de Ausubel, relacionando o conceito de magnitude limite ao poder de captação de luz de um instrumento ótico.
Vertchenko, Lev, Silveira, Tomás de Aquino   +1 more
openaire   +1 more source

Science with Simbol-X

, 2007
Simbol-X is a French-Italian mission, with a participation of German laboratories, for X-ray astronomy in the wide 0.5-80 keV band. Taking advantage of emerging technology in mirror manufacturing and spacecraft formation flying, Simbol-X will push ...
Arnaud, M., Briel, U., Cappi, M., Comastri, A., Decourchelle, A., Della Ceca, R., Ferrando, Ph., Feruglio, C., Fiore, F., Gilli, R., Giommi, P., Goldwurn, A., Grandi, P., Laurent, Ph., Lebrun, F., Malaguti, G., Micela, G., Pareschi, G., Piconcelli, E., Puccetti, S., Roques, J. -P., Tagliaferri, G., Vignali, C.   +22 more
core   +1 more source

Transient Terahertz Oscillations During Photoinduced Polarization Topology Reconfiguration in Ferroelectric Superlattices

Advanced Science, EarlyView.
Terahertz resonances in crystalline heterostructures could close a spectral gap between conventional electronics and photonics while opening new windows on non‐equilibrium lattice dynamics. Femtosecond optical screening of the depolarization field in epitaxial PbTiO3/SrTiO3 superlattices launches a collective polar mode that oscillates near 1 THz and ...
Deepankar Sri Gyan, Hyeon Jun Lee, Xiangwei Guo, Youngjun Ahn, Samuel D. Marks, Mohammed H. Yusuf, Matthew Dawber, James M. Glownia, Diling Zhu, Takahiro Sato, Sanghoon Song, Haidan Wen, Jia‐Mian Hu, Paul G. Evans   +13 more
wiley   +1 more source

Erratum: IRAS observations of irregular galaxies [PDF]

In Infrared Astronomy Satellite (IRAS) observations of irregular galaxies, galactic blue luminosities were based on standard optical definitions. The blue luminosities (L sub B) were derived from the blue absolute magnitude (M sub B) or form the in band ...
Gallagher, J. S., Hunter, D. A.
core   +1 more source

Symmetry‐Driven Unconventional Magnetoelectric Coupling in Perovskite Altermagnets: From Bulk to the Two‐Dimensional Limit

Advanced Science, EarlyView.
The symmetry‐driven coexistence of altermagnetism and (anti)ferroelectricity in perovskites shows a strong dimensional dependence. Upon reducing the system from bulk to the two‐dimensional limit, only C‐type antiferromagnetic order retains ferroelectrically switchable altermagnetism, whereas A‐ and G‐type orders become conventional antiferromagnets ...
Zhou Cui, Ziye Zhu, Xunkai Duan, Bowen Hao, Xianzhang Chen, Jiayong Zhang, Tong Zhou   +6 more
wiley   +1 more source

Extending the Micro-hertz Detection Horizons via Orbital Resonance Effect for Geocentric Gravitational Wave Antennas

The Astrophysical Journal
The μ Hz gravitational wave (GW) band holds crucial insights into coalescing supermassive black hole binaries (SMBHBs) and stochastic backgrounds but remains inaccessible due to technical challenges.
Qiong Deng, Minghui Du, Peng Xu, Liang Huang, Ziren Luo   +4 more
doaj   +1 more source

Toward Efficient and Accurate EMRI Parameter Estimation: A Machine Learning-Enhanced MCMC Framework

Research
The detection of gravitational waves from extreme-mass-ratio inspirals (EMRIs) in space-based antennas like Taiji and Laser Interferometer Space Antenna promises deep insights into strong-field gravity and black hole physics. However, the complex, highly
Bo Liang, Chang Liu, Hanlin Song, Zhenwei Lyu, Minghui Du, Peng Xu, Ziren Luo, Sensen He, Haohao Gu, Tianyu Zhao, Manjia Liang, Yuxiang Xu, Li-e Qiang, Mingming Sun, Wei-Liang Qian   +14 more
doaj   +1 more source

A new method to improve photometric redshift reconstruction. Applications to the Large Synoptic Survey Telescope

, 2013
In the next decade, the LSST will become a major facility for the astronomical community. However accurately determining the redshifts of the observed galaxies without using spectroscopy is a major challenge.
Abate, Alexandra, Ansari, Réza, Barrau, Aurélien, Baumont, Sylvain, Gorecki, Alexia, Moniez, Marc, Ricol, Jean-Stéphane   +6 more
core   +3 more sources