Quantum transport on two-dimensional regular graphs

Details Quantum transport on two-dimensional regular graphs Quantum transport on two-dimensional regular graphs

2006-10-25

arxiv.org/abs/quant-ph/0610212v1

J. Phys. A 39, 14997 (2006)

Physics

Quantum Physics

22 pages, 11 figure, acceted for publication in J.Phys.A

Scientific paper

10.1088/0305-4470/39/48/011

We study the quantum-mechanical transport on two-dimensional graphs by means of continuous-time quantum walks and analyse the effect of different boundary conditions (BCs). For periodic BCs in both directions, i.e., for tori, the problem can be treated in a large measure analytically. Some of these results carry over to graphs which obey open boundary conditions (OBCs), such as cylinders or rectangles. Under OBCs the long time transition probabilities (LPs) also display asymmetries for certain graphs, as a function of their particular sizes. Interestingly, these effects do not show up in the marginal distributions, obtained by summing the LPs along one direction.

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