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  • Electronic structure and strongly correlated systems  (6)
  • Georgia (Republic)  (3)
  • Condensed Matter: Structure, etc.  (1)
  • 1
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    Spin-orbit coupled fermions in ladderlike optical lattices at half filling (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-10-03
    Description: Author(s): G. Sun, J. Jaramillo, L. Santos, and T. Vekua We study the ground-state phase diagram of two-component fermions loaded in a ladderlike lattice at half filling in the presence of spin-orbit coupling. For repulsive fermions with unidirectional spin-orbit coupling along the legs we identify a Néel state which is separated from rung-singlet and fer... [Phys. Rev. B 88, 165101] Published Wed Oct 02, 2013
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 2
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    Field-Induced Phase Transitions of Repulsive Spin-1 Bosons in Optical Lattices (2011)
    American Physical Society (APS)
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    Publication Date: 2011-03-10
    Description: Author(s): K. Rodríguez, A. Argüelles, A. K. Kolezhuk, L. Santos, and T. Vekua We study the phase diagram of repulsively interacting spin-1 bosons in optical lattices at unit filling, showing that an externally induced quadratic Zeeman effect may lead to a rich physics characterized by various phases and phase transitions. We find that the main properties of the system may be ... [Phys. Rev. Lett. 106, 105302] Published Wed Mar 09, 2011
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 3
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    Universal logarithmic temperature dependence of magnetic susceptibility of one-dimensional electrons at critical values of magnetic field (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-03-26
    Description: Author(s): T. Vekua We study the leading low-temperature dependence of magnetic susceptibility of one-dimensional electrons with a fixed total number of particles at the magnetic fields equal to zero-temperature critical values where the magnetic field induces commensurate-incommensurate quantum phase transitions. For ... [Phys. Rev. B 89, 121112] Published Tue Mar 25, 2014
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Earliest Pleistocene hominid cranial remains from Dmanisi, Republic of Georgia: taxonomy, geological setting, and age (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-05-12
    Description: Archaeological excavations at the site of Dmanisi in the Republic of Georgia have uncovered two partial early Pleistocene hominid crania. The new fossils consist of a relatively complete cranium and a second relatively complete calvaria from the same site and stratigraphic unit that yielded a hominid mandible in 1991. In contrast with the uncertain taxonomic affinity of the mandible, the new fossils are comparable in size and morphology with Homo ergaster from Koobi Fora, Kenya. Paleontological, archaeological, geochronological, and paleomagnetic data from Dmanisi all indicate an earliest Pleistocene age of about 1.7 million years ago, supporting correlation of the new specimens with the Koobi Fora fossils. The Dmanisi fossils, in contrast with Pleistocene hominids from Western Europe and Eastern Asia, show clear African affinity and may represent the species that first migrated out of Africa.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gabunia, L -- Vekua, A -- Lordkipanidze, D -- Swisher, C C 3rd -- Ferring, R -- Justus, A -- Nioradze, M -- Tvalchrelidze, M -- Anton, S C -- Bosinski, G -- Joris, O -- Lumley, M A -- Majsuradze, G -- Mouskhelishvili, A -- New York, N.Y. -- Science. 2000 May 12;288(5468):1019-25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Republic of Georgia National Academy of Sciences, Tbilisi, 380007, Republic of Georgia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10807567" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Animals ; Asia ; Emigration and Immigration ; Europe ; Female ; *Fossils ; Geologic Sediments ; Georgia (Republic) ; History, Ancient ; *Hominidae/anatomy & histology/classification ; Humans ; Male ; Paleodontology ; Skull/*anatomy & histology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    A new skull of early Homo from Dmanisi, Georgia (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-07-06
    Description: Another hominid skull has been recovered at Dmanisi (Republic of Georgia) from the same strata in which hominid remains have been reported previously. The Dmanisi site dated to approximately 1.75 million years ago has now produced craniofacial portions of several hominid individuals, along with many well-preserved animal fossils and quantities of stone artifacts. Although there are certain anatomical differences among the Dmanisi specimens, the hominids do not clearly represent more than one taxon. We assign the new skull provisionally to Homo erectus (=ergaster). The Dmanisi specimens are the most primitive and small-brained fossils to be grouped with this species or any taxon linked unequivocally with genus Homo and also the ones most similar to the presumed habilis-like stem. We suggest that the ancestors of the Dmanisi population dispersed from Africa before the emergence of humans identified broadly with the H. erectus grade.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vekua, Abesalom -- Lordkipanidze, David -- Rightmire, G Philip -- Agusti, Jordi -- Ferring, Reid -- Maisuradze, Givi -- Mouskhelishvili, Alexander -- Nioradze, Medea -- De Leon, Marcia Ponce -- Tappen, Martha -- Tvalchrelidze, Merab -- Zollikofer, Christoph -- New York, N.Y. -- Science. 2002 Jul 5;297(5578):85-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Georgian State Museum, Georgian Academy of Sciences, 3 Purtseladze Street, Tbilisi 380007, Georgia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12098694" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Animals ; Anthropology, Physical ; Brain/anatomy & histology ; Cephalometry ; Emigration and Immigration ; *Fossils ; Frontal Bone/anatomy & histology ; Geologic Sediments ; Georgia (Republic) ; *Hominidae/anatomy & histology/classification ; Humans ; Mandible/anatomy & histology ; Nasal Bone/anatomy & histology ; Orbit/anatomy & histology ; Parietal Bone/anatomy & histology ; Rodentia ; Skull/*anatomy & histology ; Temporal Bone/anatomy & histology ; Tooth
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Topological quasi-one-dimensional state of interacting spinless electrons (2016)
    American Physical Society (APS)
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    Publication Date: 2016-05-24
    Description: Author(s): G. Sun and T. Vekua By decreasing the transversal confinement potential in interacting one-dimensional spinless electrons and populating the second energetically lowest subband for not too strong interactions system transitions into a quasi-one-dimensional state with dominant superconducting correlations and one gaples… [Phys. Rev. B 93, 205137] Published Mon May 23, 2016
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 7
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    A complete skull from Dmanisi, Georgia, and the evolutionary biology of early Homo (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-10-19
    Description: The site of Dmanisi, Georgia, has yielded an impressive sample of hominid cranial and postcranial remains, documenting the presence of Homo outside Africa around 1.8 million years ago. Here we report on a new cranium from Dmanisi (D4500) that, together with its mandible (D2600), represents the world's first completely preserved adult hominid skull from the early Pleistocene. D4500/D2600 combines a small braincase (546 cubic centimeters) with a large prognathic face and exhibits close morphological affinities with the earliest known Homo fossils from Africa. The Dmanisi sample, which now comprises five crania, provides direct evidence for wide morphological variation within and among early Homo paleodemes. This implies the existence of a single evolving lineage of early Homo, with phylogeographic continuity across continents.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lordkipanidze, David -- Ponce de Leon, Marcia S -- Margvelashvili, Ann -- Rak, Yoel -- Rightmire, G Philip -- Vekua, Abesalom -- Zollikofer, Christoph P E -- New York, N.Y. -- Science. 2013 Oct 18;342(6156):326-31. doi: 10.1126/science.1238484.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Georgian National Museum, 3 Purtseladze Street, 0105 Tbilisi, Georgia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24136960" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Brain/anatomy & histology ; Dentition ; Face/*anatomy & histology ; *Fossils ; Georgia (Republic) ; Hominidae/*anatomy & histology/growth & development ; Humans ; Organ Size ; Phylogeography ; Skull/*anatomy & histology/growth & development ; Skull Base/anatomy & histology/growth & development ; Temporal Bone/anatomy & histology/growth & development
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Fidelity susceptibility and conductivity of the current in one-dimensional lattice models with open or periodic boundary conditions (2013)
    American Physical Society (APS)
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    Publication Date: 2013-11-02
    Description: Author(s): S. Greschner, A. K. Kolezhuk, and T. Vekua We study, both numerically and analytically, the finite-size scaling of the fidelity susceptibility χ J with respect to the charge or spin current in one-dimensional lattice models and relate it to the low-frequency behavior of the corresponding conductivity. It is shown that in gapless systems with ... [Phys. Rev. B 88, 195101] Published Fri Nov 01, 2013
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 9
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    Exploring spin-orbital models with dipolar fermions in zigzag optical lattices (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-11-01
    Description: Author(s): G. Sun, G. Jackeli, L. Santos, and T. Vekua Ultracold dipolar spinor fermions in zig-zag–type optical lattices can mimic spin-orbital models relevant in solid-state systems, as transition-metal oxides with partially filled d levels, with the interesting advantage of reviving the quantum nature of orbital fluctuations. We discuss two different... [Phys. Rev. B 86, 155159] Published Wed Oct 31, 2012
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
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    Topics: Physics
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  • 10
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    Magnetic-field-induced criticality in superconducting two-leg ladders (2017)
    American Physical Society (APS)
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    Publication Date: 2017-03-25
    Description: Author(s): Temo Vekua We study magnetic-field-induced critical singularities in the superconducting phase of the hole-doped Hubbard model of repulsively interacting electrons, defined on a two-leg ladder. We argue that, provided the low-energy spin excitations in doped ladders carry electric charge, the low-temperature t… [Phys. Rev. B 95, 115143] Published Fri Mar 24, 2017
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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