CMT Seminar - Monday, January 24th - Eun-Ah Kim, Cornell University

[Longbrake, Patricia]

The CMT Seminar on Monday, January 24th will be presented by Eun-Ah Kim from Cornell University. The talk will take place at 11:30am in the Smith Seminar Room.  Please contact me as soon as possible if you would like to meet with Dr. Kim during her visit.

Title:  Electronic Liquid Crystal Correlations in the Pseudogap States of High Tc Superconductors

Abstract:  The nature of pseudogap phase of cuprate oxides has been one of the most debated topic in condensed matter physics. Recently, the peculiarities of the pseudogap states were beautifully captured by STM data on Bi2Sr2CaCu2O8+x in the form of an inhomogenious spatial pattern of density of states. From these pseudogap patterns, we constructed liquid crystalline order parameter fields to quantify the symmetry breaking features[1]. These fields reveal two properties of the pseudogap phase: it has a net anisotropy (nematic order) over at least 100 nm length scales; the stripe-like smectic order in the patterns impacts the nematic order locally at dislocations in the tripe pattern. Further, we could construct a Ginzburg-Landau free energy of nematic and smectic order parameter elds that is minimally allowed by symmetry and capture these two properties[2]. Our results point towards important role of oxygen sites for microscopic models and open up opportunities to investigate the role these properties of pseudogap states play in superconductivity of high Tc cuprates.

[1] Lawler, Fujita et. al., Nature 466, 347 (2010).
[2] Mesaros, Fujita et. al., Science (2011)


Thank you,
Trisch
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