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Dynamical Josephson Effects in NbSe2

James Williams, U. of Maryland
Thursday, March 14, 2019 - 12:30pm to 1:30pm
PAT C-520

In this talk, I will discuss our recent results [1] working towards understanding the superconducting state in NbSe2. We have found that the superconducting to normal state transition happens via the creation of a localized string of vortices called a phase slip line. We manipulate the string of vortices like a Josephson junction using RF radiation and uncover to unexpected phenomena. The first is a novel coupling between two collective modes in NbSe2: a mode-locking effect occurring between the dynamics of Cooper pairs and a change density wave. The second is a Josephson effect which is insensitive magnetic field, unlike any known Josephson behavior. I will then discuss possible origins of the observed effects.

[1] S. Tran, J. Sell and J. R. Williams, arXiv:1903.00453 (2019).