Departmental Seminar:
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May 19, 2005 11:00 AM,
Boundary Susceptibility of the open spin-1/2 XXZ-chain
Speaker: Michael Bortz (ANU)
Abstract: In the first part, the boundary susceptibility of the open antiferromagnetic spin-1/2 XXZ-chain is calculated at zero temperature and arbitrary magnetic field by Bethe ansatz. We present analytical results for the leading terms when the magnetic field is small and a numerical solution for the entire range of fields. The second part focusses on the finite-temperature behavior of the susceptibility. Recent field-theory predictions for low temperatures are reviewed. The density-matrix renormalization group for transfer matrices is used to calculate the susceptibility for all temperatures. In the third part, an outlook is given about the issue in how far the finite-temperature behavior is accessible analytically within the quantum transfer matrix approach.
Contact: Sergey Sergeev sergey.sergeev@anu.edu.au Tel.6125 1002
