气候变化领域集成服务门户(CCPortal): Tuning interactions between spins in a superconductor

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DOI	10.1073/pnas.2024837118
	Tuning interactions between spins in a superconductor
	Ding H.; Hu Y.; Randeria M.T.; Hoffman S.; Deb O.; Klinovaja J.; Loss D.; Yazdani A.
发表日期	2021
ISSN	00278424
卷号	118 期号:14
英文摘要	Novel many-body and topological electronic phases can be created in assemblies of interacting spins coupled to a superconductor, such as one-dimensional topological superconductors with Majorana zero modes (MZMs) at their ends. Understanding and controlling interactions between spins and the emergent band structure of the in-gap Yu-Shiba-Rusinov (YSR) states they induce in a superconductor are fundamental for engineering such phases. Here, by precisely positioning magnetic adatoms with a scanning tunneling microscope (STM), we demonstrate both the tunability of exchange interaction between spins and precise control of the hybridization of YSR states they induce on the surface of a bismuth (Bi) thin film that is made superconducting with the proximity effect. In this platform, depending on the separation of spins, the interplay among Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, spin-orbit coupling, and surface magnetic anisotropy stabilizes different types of spin alignments. Using high-resolution STM spectroscopy at millikelvin temperatures, we probe these spin alignments through monitoring the spin-induced YSR states and their energy splitting. Such measurements also reveal a quantum phase transition between the ground states with different electron number parity for a pair of spins in a superconductor tuned by their separation. Experiments on larger assemblies show that spin-spin interactions can be mediated in a superconductor over long distances. Our results show that controlling hybridization of the YSR states in this platform provides the possibility of engineering the band structure of such states for creating topological phases. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Condensed matter physics; Majorana fermions; Scanning tunneling microscopy; Superconductivity; Topological states
语种	英语
scopus关键词	bismuth; accuracy; anisotropy; Article; chemical interaction; chemical structure; hybridization; magnetism; priority journal; quantum mechanics; scanning tunneling microscopy; separation technique; temperature
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179973
作者单位	Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544, United States; Department of Physics, Princeton University, Princeton, NJ 08544, United States; Department of Physics, University of Basel, Basel, CH-4056, Switzerland; Department of Physics, University of Florida, Gainesville, FL 32611, United States
推荐引用方式 GB/T 7714	Ding H.,Hu Y.,Randeria M.T.,et al. Tuning interactions between spins in a superconductor[J],2021,118(14).
APA	Ding H..,Hu Y..,Randeria M.T..,Hoffman S..,Deb O..,...&Yazdani A..(2021).Tuning interactions between spins in a superconductor.Proceedings of the National Academy of Sciences of the United States of America,118(14).
MLA	Ding H.,et al."Tuning interactions between spins in a superconductor".Proceedings of the National Academy of Sciences of the United States of America 118.14(2021).