NOVEL PROPERTIES AND TOPOLOGICAL PHASES IN STRONGLY CORRELATED PYROCHLORE SYSTEMS
Abstract
Thus far topological responses and phases have been mainly studied in non-correlated systems such as the topological insulator Bi2Se3 and the topological semimetal TaAs. Strongly correlated topological phases have been first predicted in pyrochlore irridates in 2011, but the development has been hampered by the low quality of the crystals and thin films. Recently, progress has been made in the thin film synthesis, and anomalous Hall effect without detectable magnetization was observed in Eu2Ir2O7 and Pr2Ir2O7 thin films, which indicate the correlated Weyl semimetal phases in these two compounds. Nevertheless, how the Berry curvature (magnetic field in the momentum space) and its dynamics manifest in these topological semimetals, as well as the effects of domain structures, remain critical and still-wide-open questions. In this three-year project, we propose to use scanning and time-resolved magneto-optical Kerr effect and second harmonic generation microscopy, and magneto-terahertz spectroscopy to study the domain evolution, the Berry curvature effect, and its dynamics in pyrochlore irridates Eu2Ir2O7 and Pr2Ir2O7 thin films. This work will help to establish the comprehensive fundamental understanding of various aspects of strongly correlated topological materials in both the real and momentum space and also their temporal dynamics in order to establish them as new platforms for topological spintronics and information processing.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA95502210410
Entities
People
- Liang Wu
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Pennsylvania