Finite temperature dynamical DMRG and the Drude weight of spin-1/2 chains

Details Finite temperature dynamical DMRG and the Drude weight of spin-1/2 chains Finite temperature dynamical DMRG and the Drude weight of spin-1/2 chains

2011-11-18

arxiv.org/abs/1111.4508v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We propose an easily implemented approach to study time-dependent correlation functions of one dimensional systems at finite temperature T using the density matrix renormalization group. The entanglement growth inherent to any time-dependent calculation is significantly reduced if the auxiliary degrees of freedom which purify the statistical operator are time evolved with the physical Hamiltonian but reversed time. We exploit this to investigate the long time behavior of current correlation functions of the XXZ spin-1/2 Heisenberg chain. This allows a direct extraction of the Drude weight D at intermediate to large T. We find that D is nonzero -- and thus transport is dissipationless -- everywhere in the gapless phase. At low temperatures we establish an upper bound to D by comparing with bosonization.

Affiliated with

Also associated with

No associations

Rating

Finite temperature dynamical DMRG and the Drude weight of spin-1/2 chains does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Finite temperature dynamical DMRG and the Drude weight of spin-1/2 chains, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Finite temperature dynamical DMRG and the Drude weight of spin-1/2 chains will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-514240