First-principles spin relaxation in Two-dimensional materials- proximity, twisting and doping effects
Abstract
Spin relaxation and decoherence are at the heart of spintronics and quantum information science (QIS). The development of low-power spintronics devices requires long spin lifetime and diffusion length at room temperature. And harnessing the spin degree of freedom for quantum computation requires long spin relaxation and coherence time for reliable manipulation of spin qubits. Realization of these technologies require rational design of materials based on accurate prediction of spin lifetime without prior input parameters. The overarching goal of this proposed research is to develop next-generation first-principles computational platforms to accurately describe spin relaxation and decoherence processes and quantitatively determine spin lifetime including couplings with environmental degrees of freedom. The proposed research will deliver key computational techniques that can reliably predict spin and exciton lifetime through first-principles density-matrix dynamics with environmental couplings and manybody interactions. This proposed work will allow the extension of our framework from one-particle density matrix to two-particle density matrix with spin-orbit couplings, where exciton and spin dynamics can be studied simultaneously in one real-time simulation. If successful, this research will establish an important milestone for first-principles open quantum dynamics. With our methods, we will investigate the effects of proximity, twisting and doping on spin dynamics at two-dimensional (2D) interfaces. This research program will provide new and unbiased insights for spin relaxation and decoherence at 2D heterostructures, and suggest design rules of tuning and constructing new 2D interfaces which can have unprecedented potentials in spintronics and quantum information technologies.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 07, 2023
- Source ID
- FA95502110087
Entities
People
- Yuan Ping
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of California, Santa Cruz