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Title: Engineering of mixed pairing and non-Abelian Majorana states in chiral p-wave superconductor Sr2RuO4 and other materials

This project deals with odd-parity superconductor Sr2RuO4 and related material systems, aiming at understanding the unconventional nature of superconductivity in this material. An odd-parity superconductor is expected to feature a novel topological object, the half-flux-quantum vortex that hosts a Majorana anyons. Majorana anyons carry non-Abelian statistics that can be used as the building block for constructing a fault-tolerated topological quantum computer. Half-flux-quantum vortices form in an odd-parity superconductor because of the availability of charge neutral spin supercurrent in addition to the normal supercurrent. Half-height magnetization steps were found in a cantilever magnetometry measurement of doubly connected mesoscopic samples of Sr2RuO4 in the presence of an in-plane magnetic field (J. Jang, D. G. Ferguson, V. Vakaryuk, R. Budakian, S. B. Chung, P. M. Goldbart, and Y. Maeno, Science 331, 186 (2011)), which suggests the presence of a half-flux-quantum (Φ0/2 = h/4e) state. Evidence for half flux quantum states, which can be viewed as coreless half vortices, was obtained in mesoscopic samples of Sr2RuO4 in the torque magnetomitry measurements. However, the existence of such an important property has not been confirmed by any other independent measurement.
Authors:
 [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Physics
Publication Date:
OSTI Identifier:
1320517
Report Number(s):
DOE-PSU--46159
TRN: US1700263
DOE Contract Number:
FG02-04ER46159
Resource Type:
Technical Report
Research Org:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; MAJORANA SPINORS; PARITY; P WAVES; SUPERCONDUCTORS; SUPERCONDUCTIVITY; ANYONS; CHIRALITY; VORTICES; QUANTUM COMPUTERS; SPIN; MAGNETIC FIELDS; MIXED STATES; MAGNETIZATION; TORQUE; STRONTIUM OXIDES; RUTHENIUM OXIDES