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Início
Agenda
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- 21 de agosto de 2018 (terça-feira)
14h
Sala
18 (Cristalografia) -
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Vladimir
Dobrosavljevic
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Department of
Physics and National High Magnetic Field Laboratory
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Florida State
University, EUA
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Geometrically
Frustrated Coulomb Liquids
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We show [1] that introducing long-range Coulomb
interactions immediately lifts the massive ground state
degeneracy induced by geometric frustration for electrons on
quarter-filled triangular lattices in the classical limit.
Important consequences include the stabilization of a
stripe-ordered crystalline (global) ground state, but also the
emergence of very many low-lying metastable states with
amorphous "stripe-glass" spatial structures [2].
Melting of the stripe order thus leads to a frustrated Coulomb
liquid at intermediate temperatures, showing remarkably slow
(viscous) dynamics, with very long relaxation times growing in
Arrhenius fashion upon cooling, as typical of strong glass
formers. On shorter time scales, the system falls out of
equilibrium and displays the aging phenomena characteristic of
super-cooled liquids around the glass transition. Our results
show remarkable similarity with the recent observations [3, 4]
of charge-glass behavior in ultra-clean triangular organic
materials of the θ- (BEDT-TTF) family.
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[1]. S. Mahmoudian, L. Rademaker, A. Ralko, S.
Fratini, and V. Dobrosavljević, Phys. Rev. Lett. 115, 025701.
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[2]. J. Schmalian and P. G. Wolynes, Phys. Rev.
Lett. 85, 836 (2000).
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[3]. F. Kagawa, T. Sato, K. Miyagawa, K. Kanoda, Y.
Tokura, K. Kobayashi, R. Kumai, and Y.
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Murakami, Nat. Phys. 9, 422 (2013).
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[4]. H. Oike, F. Kagawa, N. Ogawa, A. Ueda, H.
Mori, M. Kawasaki, and Y. Tokura, Phys. Rev. B 91, 041101
(2015).
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