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  • 1
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    Quantum impurity in a nearly critical two-dimensional antiferromagnet (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2000-01-05
    Beschreibung: The spin dynamics of an arbitrary localized impurity in an insulating two-dimensional antiferromagnet, across the host transition from a paramagnet with a spin gap to a Neel state, is described. The impurity spin susceptibility has a Curie-like divergence at the quantum-critical coupling, but with a universal effective spin that is neither an integer nor a half-odd integer. In the Neel state, the transverse impurity susceptibility is a universal number divided by the host spin stiffness (which determines the energy cost to slow twists in the orientation of the Neel order). These and numerous other results for the thermodynamics, Knight shift, and magnon damping have important applications in experiments on layered transition metal oxides.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev -- Buragohain -- Vojta -- New York, N.Y. -- Science. 1999 Dec 24;286(5449):2479-82.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Yale University, Post Office Box 208120, New Haven, CT 06520-8120, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10617456" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 2
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    Quantum criticality: competing ground states in low dimensions (2000)
    American Association for the Advancement of Science (AAAS)
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    Publikationsdatum: 2000-04-25
    Beschreibung: Small changes in an external parameter can often lead to dramatic qualitative changes in the lowest energy quantum mechanical ground state of a correlated electron system. In anisotropic crystals, such as the high-temperature superconductors where electron motion occurs primarily on a two-dimensional square lattice, the quantum critical point between two such lowest energy states has nontrivial emergent excitations that control the physics over a significant portion of the phase diagram. Nonzero temperature dynamic properties near quantum critical points are described, using simple theoretical models. Possible quantum phases and transitions in the two-dimensional electron gas on a square lattice are discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev -- New York, N.Y. -- Science. 2000 Apr 21;288(5465):475-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Yale University, Post Office Box 208120, New Haven, CT 06520-8120, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10775100" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 3
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    Topological defects coupling smectic modulations to intra-unit-cell nematicity in cuprates (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2011-07-23
    Beschreibung: We study the coexisting smectic modulations and intra-unit-cell nematicity in the pseudogap states of underdoped Bi(2)Sr(2)CaCu(2)O(8+delta). By visualizing their spatial components separately, we identified 2pi topological defects throughout the phase-fluctuating smectic states. Imaging the locations of large numbers of these topological defects simultaneously with the fluctuations in the intra-unit-cell nematicity revealed strong empirical evidence for a coupling between them. From these observations, we propose a Ginzburg-Landau functional describing this coupling and demonstrate how it can explain the coexistence of the smectic and intra-unit-cell broken symmetries and also correctly predict their interplay at the atomic scale. This theoretical perspective can lead to unraveling the complexities of the phase diagram of cuprate high-critical-temperature superconductors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mesaros, A -- Fujita, K -- Eisaki, H -- Uchida, S -- Davis, J C -- Sachdev, S -- Zaanen, J -- Lawler, M J -- Kim, Eun-Ah -- New York, N.Y. -- Science. 2011 Jul 22;333(6041):426-30. doi: 10.1126/science.1201082.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituut-Lorentz for Theoretical Physics, Universiteit Leiden, 2300 Leiden, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21778393" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 4
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    2012 election. Food labeling issue tops state ballot questions (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2012-11-01
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev, Meghna -- New York, N.Y. -- Science. 2012 Oct 26;338(6106):464. doi: 10.1126/science.338.6106.464.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23112307" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): California ; Food Labeling/*legislation & jurisprudence ; *Food, Genetically Modified ; *Plants, Genetically Modified ; *Politics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 5
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    Physics. Entangling superconductivity and antiferromagnetism (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2012-06-23
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev, Subir -- New York, N.Y. -- Science. 2012 Jun 22;336(6088):1510-1. doi: 10.1126/science.1223586.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Harvard University, Cambridge, MA 02138, USA. sachdev@physics.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22723399" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 6
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    Sign-problem-free quantum Monte Carlo of the onset of antiferromagnetism in metals (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2012-12-22
    Beschreibung: The quantum theory of antiferromagnetism in metals is necessary for our understanding of numerous intermetallic compounds of widespread interest. In these systems, a quantum critical point emerges as external parameters (such as chemical doping) are varied. Because of the strong coupling nature of this critical point and the "sign problem" plaguing numerical quantum Monte Carlo (QMC) methods, its theoretical understanding is still incomplete. Here, we show that the universal low-energy theory for the onset of antiferromagnetism in a metal can be realized in lattice models, which are free from the sign problem and hence can be simulated efficiently with QMC. Our simulations show Fermi surface reconstruction and unconventional spin-singlet superconductivity across the critical point.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berg, Erez -- Metlitski, Max A -- Sachdev, Subir -- New York, N.Y. -- Science. 2012 Dec 21;338(6114):1606-9. doi: 10.1126/science.1227769.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Harvard University, Cambridge, MA 02138, USA. erez.berg@gmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23258893" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 7
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    Superconductivity. Tuning order in cuprate superconductors (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2002-01-19
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev, Subir -- Zhang, Shou-Cheng -- New York, N.Y. -- Science. 2002 Jan 18;295(5554):452-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Yale University, New Haven, CT 06520, USA. subir.sachdev@yale.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11799229" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 8
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    Deconfined quantum critical points (2004)
    American Association for the Advancement of Science (AAAS)
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    Publikationsdatum: 2004-03-06
    Beschreibung: The theory of second-order phase transitions is one of the foundations of modern statistical mechanics and condensed-matter theory. A central concept is the observable order parameter, whose nonzero average value characterizes one or more phases. At large distances and long times, fluctuations of the order parameter(s) are described by a continuum field theory, and these dominate the physics near such phase transitions. We show that near second-order quantum phase transitions, subtle quantum interference effects can invalidate this paradigm, and we present a theory of quantum critical points in a variety of experimentally relevant two-dimensional antiferromagnets. The critical points separate phases characterized by conventional "confining" order parameters. Nevertheless, the critical theory contains an emergent gauge field and "deconfined" degrees of freedom associated with fractionalization of the order parameters. We propose that this paradigm for quantum criticality may be the key to resolving a number of experimental puzzles in correlated electron systems and offer a new perspective on the properties of complex materials.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Senthil, T -- Vishwanath, Ashvin -- Balents, Leon -- Sachdev, Subir -- Fisher, Matthew P A -- New York, N.Y. -- Science. 2004 Mar 5;303(5663):1490-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. senthil@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15001771" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 9
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    Angular fluctuations of a multicomponent order describe the pseudogap of YBa2Cu3O(6+x) (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2014-03-22
    Beschreibung: The hole-doped cuprate high-temperature superconductors enter the pseudogap regime as their superconducting critical temperature, Tc, falls with decreasing hole density. Recent x-ray scattering experiments in YBa2Cu3O(6+x) observe incommensurate charge-density wave fluctuations whose strength rises gradually over a wide temperature range above Tc, but then decreases as the temperature is lowered below Tc. We propose a theory in which the superconducting and charge-density wave orders exhibit angular fluctuations in a six-dimensional space. The theory provides a natural quantitative fit to the x-ray data and can be a basis for understanding other characteristics of the pseudogap.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hayward, Lauren E -- Hawthorn, David G -- Melko, Roger G -- Sachdev, Subir -- New York, N.Y. -- Science. 2014 Mar 21;343(6177):1336-9. doi: 10.1126/science.1246310.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24653030" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 10
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    Fermi surface and pseudogap evolution in a cuprate superconductor (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2014-05-09
    Beschreibung: The unclear relationship between cuprate superconductivity and the pseudogap state remains an impediment to understanding the high transition temperature (T(c)) superconducting mechanism. Here, we used magnetic field-dependent scanning tunneling microscopy to provide phase-sensitive proof that d-wave superconductivity coexists with the pseudogap on the antinodal Fermi surface of an overdoped cuprate. Furthermore, by tracking the hole-doping (p) dependence of the quasi-particle interference pattern within a single bismuth-based cuprate family, we observed a Fermi surface reconstruction slightly below optimal doping, indicating a zero-field quantum phase transition in notable proximity to the maximum superconducting T(c). Surprisingly, this major reorganization of the system's underlying electronic structure has no effect on the smoothly evolving pseudogap.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉He, Yang -- Yin, Yi -- Zech, M -- Soumyanarayanan, Anjan -- Yee, Michael M -- Williams, Tess -- Boyer, M C -- Chatterjee, Kamalesh -- Wise, W D -- Zeljkovic, I -- Kondo, Takeshi -- Takeuchi, T -- Ikuta, H -- Mistark, Peter -- Markiewicz, Robert S -- Bansil, Arun -- Sachdev, Subir -- Hudson, E W -- Hoffman, J E -- New York, N.Y. -- Science. 2014 May 9;344(6184):608-11. doi: 10.1126/science.1248221.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Harvard University, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24812396" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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