Quasiparticle interference in unconventional superconducting phases

  • Alireza Akbari Asia Pacific Center for Theoretical Physics

Abstract

Bogoliubov quasiparticle interference (QPI) spectroscopy has emerged as an important tool to understand the pairing symmetry in unconventional and high Tc superconductors. This method is based on scanning tunneling microscopy (STM) and essentially involves investigating how the local density of states (LDOS) is modulated due to the presence of impurities. In recent years, QPI been used to determine the gap symmetry of unconventional superconductors, e.g. CeCoIn5. It has also been developed for non-centrosymmetric (NCS) superconductors with mixed singlet-triplet gap function. Qualitatively new effects in the QPI pattern originate from Rashba spin-orbit coupling and its associated coherence factors. This is discussed for a gap model with accidental node lines due to its composite singlet-triplet nature. Also, the QPI method is suggested as criteria to discriminate between the two most investigated models of hidden order (HO) in URu2Si2. Furthermore, the signature of proposed chiral d-wave superconducting (SC) orders parameter in QPI of the coexisting HO+SC phase is investigated.

About the Speaker

Alireza Akbari received his PhD from the Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran in 2007. He then worked as a scientific researcher at the Max Planck Institute for the Physics of Complex Systems (MPIPKS); Ruhr University Bochum; the Max Planck Institute for Chemical Physics of Solids (MPI-CPfS); and the Max Planck Institute for Solid State Research (MPIFKF). He joined the Asia Pacific Center for Theoretical Physics (APCTP) in 2014 as a group leader and is leading the "Many-Body Theory and Strongly Correlated Systems" group.

Published
2018-05-03
How to Cite
[1]
A. Akbari. Quasiparticle interference in unconventional superconducting phases, Proceedings of the Samahang Pisika ng Pilipinas 36, SPP-2018-INV-3A-01 (2018). URL: https://paperview.spp-online.org/proceedings/article/view/SPP-2018-INV-3A-01.