1306.4498 (Tomaz Prosen et al.)

Families of quasi-local conservation laws and quantum spin transport    [PDF]

Tomaz Prosen, Enej Ilievski

For fundamental integrable quantum chains with deformed symmetries we outline a general procedure for defining a continuous family of quasi-local operators whose time-derivative is supported near the two boundary sites only. The program is implemented for a spin 1/2 XXZ chain, resulting in improved rigorous estimates for the high temperature spin Drude weight.

View original: http://arxiv.org/abs/1306.4498