Orthorhombic-to-monoclinic transition in Ta$_2$NiSe$_5$ due to a zone-center optical phonon instability [PDF]
Phys. Rev. Materials 4, 083601 (2020), 2020 I study dynamical instabilities in Ta$_2$NiSe$_5$ using density functional theory based calculations. The calculated phonon dispersions show two unstable optical branches. All the acoustic branches are stable, which shows that an elastic instability is not the primary cause of the experimentally observed orthorhombic-to-monoclinic structural transition
arxiv +1 more source
A Natural Community of Interests and Sympathies: Russia and America in the 19th Century
Концепт: философия, религия, культура, 2022 This brief review of the first century of Russian-American relations seeks to explain why the profound conflict between the ideological foundations of the two states — an autocratic empire and a democratic republic — did not hamper the relations between ...
S. M. Plekhanov
doaj +1 more source
Electron-phonon superconductivity and charge density wave instability in the layered titanium-based pnictide BaTi$_2$Sb$_2$O [PDF]
, 2012 I present the results of first principles calculations of the phonon dispersions and electron-phonon coupling for BaTi$_2$Sb$_2$O. The phonon dispersions show a weak lattice instability near the zone corners that leads to a charge-density wave phase. The calculations of the electron-phonon coupling reveal strong coupling, especially to the in-plane Ti ...
arxiv +1 more source
Geographical space and cinema images of the white Arctic on a white screen (Part II)
Проблемы постсоветского пространства, 2023 The second part of the article is devoted to the consideration of two genres of Arctic fi lms — animal (faunal) and adventure. The basis for their implementation on the screen was Russian America, Alaska — the cinematic state of Hollywood, Chukotka and ...
I. S. Zonn
doaj +1 more source
Vibrational spectrum and electron-phonon coupling of doped solid picene from first principles [PDF]
Phys. Rev. B 84, 020508(R) (2011), 2011 We study superconductivity in doped solid picene (C22H14) with linear response calculations of the phonon spectrum and electron-phonon (ep) interaction. We show that the coupling of the high-energy C bond-stretching phonons to the {\pi} molecular orbitals for a doping of ~3 electrons per picene molecule is sufficiently strong to reproduce the ...
arxiv +1 more source
Geospatial patterns and models of subsistence land use in rural Interior Alaska
Ecology and Society, 2022 Alaska Native people and rural Alaskans rely on subsistence harvesting of wild resources for their well-being. This study integrates publicly-available data from >30 Interior Alaskan communities to examine the geospatial patterns of subsistence and ...
Dana R. N. Brown +7 more
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First-principles study of the electronic structure and magnetism of CaIrO$_3$ [PDF]
Phys. Rev. B 85, 020408(R) (2012), 2011 I study the electronic structure and magnetism of postperovskite CaIrO$_3$ using first-principles calculations. The density functional calculations within the local density approximation without the combined effect of spin-orbit coupling and on-site Coulomb repulsion show the system to be metallic, which is in disagreement with the recent experimental ...
arxiv +1 more source
Climate change, moose, and subsistence harvest: social-ecological assessment of Nuiqsut, Alaska
Ecology and Society, 2022 Assessing the impact of a rapidly warming climate on subsistence-based livelihoods in the Arctic is critical for building resilience for rural communities.
Jiake Zhou +5 more
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Theory of nonlinear phononics for coherent light-control of solids [PDF]
Phys. Rev. B 89, 220301(R) (2014), 2013 We present a microscopic theory for ultrafast control of solids with high-intensity terahertz frequency optical pulses. When resonant with selected infrared-active vibrations, these pulses transiently modify the crystal structure and lead to new collective electronic properties.
arxiv +1 more source
Trigonal-to-monoclinic structural transition in TiSe$_2$ due to a combined condensation of $\mathbf{ \textit{q} = (\frac{1}{2},0,0)}$ and $\mathbf{(\frac{1}{2},0,\frac{1}{2})}$ phonon instabilities [PDF]
, 2021 I present first principles calculations of the phonon dispersions of TiSe$_2$ in the $P\overline{3}c1$ phase, which is the currently accepted low-temperature structure of this material. They show weak instabilities in the acoustic branches in the out-of-plane direction, suggesting that this phase may not be the true ground state.
arxiv +1 more source