High-Temperature Topological Superconductivity in correlated Two-Dimensional heterostructure
Abstract
Quantum technologies promise significant advances for computing and cryptography; however, a fundamental challenge is to overcome decoherence. A leading solution is to use qubits based on topologically protected surface states in topological superconductors, which typically require very low temperatures (less than one Kelvin). We propose to solve this challenge by designing and synthesizing hybrid interfaces between the high-temperature superconductor FeSe-SrTiO3 and materials that have strong spin-orbit coupling (SOC) (e.g. Bi-doped GaAs), to stabilize a high temperature (~30 Kelvin) topological superconducting state. Our novel material design approach combines synthesis, characterization, and computational techniques especially suitable for quantum materials where electrons’ interactions are strongly correlated to each other and are different from simpler materials that are well described by an independent particle approximation. Our use of the Dynamical Mean Field Theory (DMFT) method enables practical and more accurate calculations of the basic properties of correlated solids compared to conventional Density Functional Theory (DFT) approaches. Our interdisciplinary team of physicists and materials scientists will combine experiments, theory, and computations, to design and engineer atomically thin SOC-FeSe-SrTiO3 heterostructures that host the essential ingredients for stabilizing superconductivity and topological surface states simultaneously at relatively high temperatures. An efficient materials design loop will first use DFT+DMFT-computation to screen for the most promising candidates (what thickness? Which SOC materials? What strain state?), followed by advanced materials synthesis and characterization, and feedback from theory to close the design loop. A long-term impact of this project will be topologically protected quantum devices that can operate at higher temperatures.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 06, 2024
- Source ID
- FA95502310498
Entities
People
- Subhasish Mandal
Organizations
- Air Force Office of Scientific Research
- Office of the Secretary of Defense
- West Virginia University