Year: 2013
Type: article
Abstract: We consider an infinitely long 0-$\ensuremath{\pi}$ Josephson junction consisting of 0 and $\ensuremath{\pi}$ regions having different critical current densities ${j}_{c,0}$ and ${j}_{c,\ensuremath{\pi}}$. The ground state of such a junction corresponds to a spontaneously formed asymmetric semifluxon with tails decaying on different length scales. We calculate the depinning current of such a fractional vortex and show that it is different for positive and negative bias polarity. We also show that upon application of a bias current, the fractional flux (topological charge) associated with the vortex changes. We calculate the range of fractional flux associated with the vortex when the bias changes from negative to positive critical (depinning) values.
Source: Physical Review B
Authors: E. Goldobin, R. Kleiner, D. Koelle
Institution: University of Tübingen
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2027212264