"Toward a unified description of spin incoherent behavior at zero and finite temperatures"Adrian Feiguin , Northeastern University [Host: Israel Klich]
ABSTRACT:
While the basic theoretical understanding of spincharge separation in onedimension, known as "Luttinger liquid theory", has existed for some time, recently a previously unidentified regime of strongly interacting onedimensional systems at finite temperature came to light: The "spinincoherent Luttinger liquid" (SILL). This occurs when the temperature is larger than the characteristic spin energy scale. I will show that the spinincoherent state can be written exactly as a generalization of Ogata and Shiba's factorized wave function in an enlarged Hilbert space, using the socalled "thermofield formalism." Interestingly, this wavefunction can also describe the *groundstate* of other model Hamiltonians , such as tJ ladders, and the Kondo lattice. This allows us to develop a unified formalism to describe SILL physics both at zero, and finite temperatures.

Condensed Matter Seminar Tuesday, November 13, 2012 3:30 PM Physics Building, Room 204 Note special date. Note special room. 
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