Intersite vortex tunnelling in 2D lattice systems

✍ Scribed by S.E. Korshunov

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 303 KB
• Volume: 152
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(88)90099-3

✦ Synopsis

The motion of a vortex is considered for a number of 2D quantum lattice models. For the case of small quantum fluctuations this motion can be described as successive tunnelling of the vortex core from cell to cell. We have found the temperature dependence of the tunnelling probability for a rather typical regime of incoherent tunnelling (strictly exponential relaxation). For the different systems under consideration (2D planar ferromagnet, Josephson junction arrays, quantum crystal free surface) this dependence is either exponential or algebraic. The diffusion coefficient is proportional to the tunnelling probability.