Late Announcement: Harvard CMT Seminar tomorrow, 3/29

[James Gotfredson <gotfredson physics harvard edu>]

Tuesday, March 29th
Noon to 1:30
Jefferson 256
Department of Physics
Harvard University


Condensed Matter Theory Seminar:
Speaker:  Sung-Sik Lee, CMT Group, MIT
Title:
"U(1) Gauge Theory of the Hubbard Model:
Spin Liquid States and Possible Application to Organic Compund"

Abstract:

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<x-tad-smaller>Spin liquid is a theoretically proposed spin-charge separated state where charges are `frozen' (insulating) while spins are `quantum melted' (disordered). Recent experiments indicate that the spin liquid ground state may be realized in a two-dimensional organic compound which is just on insulating side of the Mott transition. In this talk I will present a U(1) gauge formalism of the Hubbard model, from which it will be argued that the spin liquid phases may be stabilized by charge fluctuations near the Mott transition in the triangular and honeycomb lattices at half</x-tad-smaller><x-tad-smaller> filling. Highly unusual experimental consequences of the spin liquid state are predicted for thermal conductivity and Raman scattering.</x-tad-smaller>