Condensed Matter Physics: Topological Heterostructures
Abstract
During the course of the project we have developed the theory and the numerical approaches to describe junctions formed by superconductors (SCs) and nodal ring Weyl semimetals (WSMs). In particular, we have focused on developing the theoretical and numerical tools to obtain the Josephson current in SC-WSM-SC junctions. One of the key property of nodal ring WSMs is to have surface states, so called "drumhead states", with an almost flat dispersion (i.e. with a very large effective mass). Such surface states are extremely interestingbecause they are a clear signature of the nodal ring character of the WSM, they are expected to give rise to anomalous transport properties, and be susceptible to strong correlation effects. We have carefully characterized the nodal rings and the corresponding bands. In real systems it is expected that the drumhead states will have some finite dispersion. We showed how SC-WSM junctions can be used to detect the effective mass (flatness) of the drumhead states. Our results suggest that a measurement of the Andreev reflection can be used to detect thepolarization and the effective mass of drumhead states. We then developed the approach to calculate the Josephson current for SC-WSM-SC junctions.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 14, 2018
- Accession Number
- AD1082687
Entities
People
- Enrico Rossi
Organizations
- College of William & Mary