Aishwarya Anuva, Raghavan Arjun, Howard Sean, Cai Zhuozhen, Thakur Gohil S, Won Choongjae, Cheong Sang-Wook, Felser Claudia, Madhavan Vidya
Department of Physics, University of Illinois Urbana-Champaign, Urbana, IL 61801.
Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, IL 61801.
Proc Natl Acad Sci U S A. 2022 May 31;119(22):e2121740119. doi: 10.1073/pnas.2121740119. Epub 2022 May 26.
SignificanceThere is an intense ongoing search for two-level quantum systems with long lifetimes for applications in quantum communication and computation. Much research has been focused on studying isolated spins in semiconductors or band insulators. Mott insulators provide an interesting alternative platform but have been far less explored. In this work we use a technique capable of resolving individual spins at atomic length scales, to measure the two-level switching of spin states in 1T-TaS. We find quasi-1D chains of spin-1/2 electrons embedded in 1T-TaS which have exceptionally long lifetimes. The discovery of long-lived spin states in a tractable van der Waal material opens doors to using Mott systems in future quantum information applications.
意义
目前正在积极寻找具有长寿命的两能级量子系统，以用于量子通信和计算。许多研究集中在研究半导体或带绝缘体中的孤立自旋。莫特绝缘体提供了一个有趣的替代平台，但探索较少。在这项工作中，我们使用一种能够在原子长度尺度上分辨单个自旋的技术，来测量1T-TaS中自旋态的两能级切换。我们发现嵌入1T-TaS中的自旋1/2电子的准一维链具有极长的寿命。在一种易于处理的范德华材料中发现长寿命自旋态，为未来在量子信息应用中使用莫特系统打开了大门。
