Bulletin of the American Physical Society
2008 APS March Meeting
Volume 53, Number 2
Monday–Friday, March 10–14, 2008; New Orleans, Louisiana
Session H2: New Developments in HTSC III |
Hide Abstracts |
Sponsoring Units: DCMP Chair: Eduardo Fradkin, University of Illinois at Urbana-Champaign Room: Morial Convention Center LaLouisiane C |
Tuesday, March 11, 2008 8:00AM - 8:36AM |
H2.00001: The role of charge order in the mechanism of high Tc Invited Speaker: |
Tuesday, March 11, 2008 8:36AM - 9:12AM |
H2.00002: From high T$_c$ superconductivity to quantum spin liquids Invited Speaker: The underdoped cuprates exhibit many unusual properties going under the name pseudogap. These observations lend support to the notion that high Tc superconductivity is intimately tied to doping of a Mott insulator. Building on earlier work on the quantum spin liquid, the resonating valence bond (RVB) idea of Anderson provides an adequate physical understanding of the pseudogap. The problem can be formulated as a gauge theory even though many details are beyond the powers of current calculational tools. Part of the difficulty is that the pseudogap phenomenology occurs only at finite temperature where precise statements about excitations and possible emergent gauge fields cannot be made. Meanwhile the problem of the quantum spin liquid is a simpler version of the high Tc problem where significant progress has been made recently. It is understood that the existence of a matter field can lead to deconfinement of the U(1) gauge theory, and novel new particles such as fermionic spinons which carry spin 1/2 and no charge, and gapless gauge bosons can emerge in a new critical state at low temperatures. Two experimental systems, the organic compound and the Kagome lattice, have emerged as promising examples of a spin liquid. I shall argue that these may be described by a spinon Fermi surface and Dirac spinons coupled to a U(1) gauge field, respectively. Further experimental tests will be discussed. [Preview Abstract] |
Tuesday, March 11, 2008 9:12AM - 9:48AM |
H2.00003: On the pseudogap in high temperature superconductors Invited Speaker: The ``pseudogap,'' a suppression of the density of states observed in at least some high temperature copper-oxide superconductors at carrier concentrations lower than that which maximizes the superconducting transition temperature, presents a long-standing and still unresolved problem in condensed matter physics. Basic questions including whether it is a signature of a new phase of matter or a consequence of thermal or quantal disordering of a superconducting or spin density wave state, remain unresolved. This talk will summarize the present status of the problem, including what is known about the form of the low temperature gap function (one gap or two), the role of thermal scattering in the formation of ``fermi arcs'' and the significance of recent recent high-field quantum oscillation experiments. \newline \newline References: \newline ``Gapless pairing and the Fermi arc in the cuprates'' A. V. Chubukov, M. R. Norman, A. J. Millis, and E. Abrahams Phys. Rev. {\bf B76}, 180501 (2007). \newline ``Antiphase Stripe Order as the Origin of Electron Pockets Observed in 1/8-Hole- Doped Cuprates,'' A. J. Millis, M. Norman, Phys. Rev. B in press (2007) (cond-mat/07090106) \newline ``Gaps and Our Understanding'' A. J. Millis Science {\bf 314}: 1888-1889 (2006). [Preview Abstract] |
Tuesday, March 11, 2008 9:48AM - 10:24AM |
H2.00004: Superconductivity, quasi-particle dynamics and strong-coupling physics Invited Speaker: I discuss the problem of superconductivity from the perspective of pairing mediated by a boson and compare with the situation of ``no-glue'' superconductivity in a strongly correlated material. This is done for Tl-doped PbTe, where recent experiments support superconductivity due to quantum valence (charge Kondo) fluctuations, and for the doped Mott insulator SrCu$_{2}$(BO$_{3})_{2}$, where d-wave superconductivity emerges due to a reorganization of a valence bond crystal state. I discuss the implications of these results for high temperature superconductivity in the cuprates. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700