On 13 Aug 2014, at 20:55, Stone, Matthew B. stonemb@ornl.gov wrote:

Thank you for the response regarding my prior question regarding the dimerized chain.

To follow up, I would like to ask a few more novice questions.

Does the DMRG ALPS routine calculate the momentum for one-dimensional systems?

No, and actually open systems don't have well defined momenta

Does the following unitcell definition have the appropriate open boundary conditions for efficient use of the DMRG routines?

<UNITCELL name="anisotropic1d" dimension="1"> <VERTEX/> <EDGE type="0"> <SOURCE vertex="1" offset="0"/> <TARGET vertex="2" offset="0"/> </EDGE> <EDGE type="1"> <SOURCE vertex="2" offset="0"/> <TARGET vertex="1" offset="1"/> </EDGE> </UNITCELL>

This unit cell looks okay, but the open boundary conditions are set in the lattice and not in the unit cell.

Matthias

Thank you, Matthew Stone