877 research outputs found
Ab initio Evidence for Strong Correlation Associated with Mott Proximity in Iron-based Superconductors
We predict that iron-based superconductors discovered near d6 configuration
(5 Fe 3d orbitals filled by 6 electrons) is located on the foot of an
unexpectedly large dome of correlated electron matter centered at the Mott
insulator at d5 (namely, half filling). This is based on the many-variable
variational Monte-Carlo results for ab initio low-energy models derived by the
downfolding. The d5 Mott proximity extends to subsequent emergence of
incoherent metals, orbital differentiations due to the Mott physics and
Hund's-rule coupling, followed by antiferromagnetic quantum criticality, in
quantitative accordance with available experiments.Comment: 9 pages, 5 figure
4週間のスタティックストレッチング介入が生体における腓腹筋筋腱複合体の柔軟性に及ぼす影響
京都大学0048新制・課程博士博士(人間健康科学)甲第18200号人健博第17号新制||人健||2(附属図書館)31058京都大学大学院医学研究科人間健康科学系専攻(主査)教授 黒木 裕士, 教授 三谷 章, 教授 杉本 直三学位規則第4条第1項該当Doctor of Human Health SciencesKyoto UniversityDFA
Ab initio two-dimensional multiband low-energy models of EtMe_3Sb[Pd(dmit)_2]_2 and \kappa-(BEDT-TTF)_2Cu(NCS)_2 with comparisons to single-band models
We present ab initio two-dimensional extended Hubbard-type multiband models
for EtMe_3Sb[Pd(dmit)_2]_2 and \kappa-(BEDT-TTF)_2Cu(NCS)_2, after a
downfolding scheme based on the constrained random phase approximation (cRPA)
and maximally-localized Wannier orbitals, together with the dimensional
downfolding. In the Pd(dmit)_2 salt, the antibonding state of the highest
occupied molecular orbital (HOMO) and the bonding/antibonding states of the
lowest unoccupied molecular orbital (LUMO) are considered as the orbital
degrees of freedom, while, in the \kappa-BEDT-TTF salt, the
HOMO-antibonding/bonding states are considered. Accordingly, a three-band model
for the Pd(dmit)_2 salt and a two-band model for the \kappa-(BEDT-TTF) salt are
derived. We derive single band models for the HOMO-antibonding state for both
of the compounds as well.Comment: 10 pages, 9 figures, 3 tables; submitted to Physical Review
Atrophy of the lower limbs in elderly women: is it related to walking ability?
This study investigated the relationship between walking ability and age-related muscle atrophy of the lower limbs in elderly women. The subjects comprised 20 young women and 37 elderly women who resided in nursing homes or chronic care institutions. The elderly subjects were divided into three groups according to their walking ability. The muscle thickness of the following ten lower limb muscles were measured by B-mode ultrasound: the gluteus maximus, gluteus medius, gluteus minimus, psoas major, rectus femoris, vastus lateralis, vastus intermedius, biceps femoris, gastrocnemius and soleus. Compared to the young group, muscle thicknesses of all muscles except the soleus muscle were significantly smaller in all the elderly groups. There were no significant differences between the fast- and slow-walking groups in the thickness of any muscle. In the dependent elderly group, noticeable muscle atrophy was observed in the quadriceps femoris muscle. The results of this study suggest that the elderly who are capable of locomotion, regardless of their walking speed, show a moderate degree of age-related atrophy, while those who do not walk exhibit more severe atrophy, especially in the quadriceps femoris muscle
Photoinduced rotamerization and dissociation of o-fluorobenzoyl chloride in solid Ar
UV light-induced reactions of o-fluorobenzoyl chloride (FBC) were investigated using infrared spectroscopy in a cryogenic Ar matrix. Photoinduced rotational isomerization from anti- to gauche-FBC was confirmed by comparison with calculated spectra. In addition, photolysis products were found to be ketene species (6-chloro-2-fluoro-2,4-cyclohexadien-1-ylidenemethanone), o-fluorobenzoyl radical, o-chlorofluorobenzene, m-chlorofluorobenzene and CO.ArticleCHEMICAL PHYSICS LETTERS. 613:34-39 (2014)journal articl
Universal platform of point-gap topological phases from topological materials
Whereas point-gap topological phases are responsible for exceptional
phenomena intrinsic to non-Hermitian systems, their realization in quantum
materials is still elusive. Here we propose a simple and universal platform of
point-gap topological phases constructed from Hermitian topological insulators
and superconductors. We show that (d-1)-dimensional point-gap topological
phases are realized by making a boundary in d-dimensional topological
insulators and superconductors dissipative. A crucial observation of the
proposal is that adding a decay constant to boundary modes in d-dimensional
topological insulators and superconductors is topologically equivalent to
attaching a (d-1)-dimensional point-gap topological phase to the boundary. We
furthermore establish the proposal from the extended version of the
Nielsen-Ninomiya theorem, relating dissipative gapless modes to point-gap
topological numbers. From the bulk-boundary correspondence of the point-gap
topological phases, the resultant point-gap topological phases exhibit
exceptional boundary states or in-gap higher-order non-Hermitian skin effects.Comment: 6+6 pages, 4+4 figures, 1+0 tabl
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