Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K3C60

Wang，Shu Ze1; Yu，Xue Qing1; Wei，Li Xuan1; Wang，Li2; Cheng，Qiang Jun1; Peng，Kun2; Cheng，Fang Jun1; Liu，Yu1; Li，Fang Sen2; Ma，Xu Cun1,3; Xue，Qi Kun1,3,4,5; Song，Can Li1,3

2024-05-30

10.1016/j.scib.2024.03.052

Science Bulletin   影响因子和分区

2095-9273

2095-9281

Magnetic impurities in superconductors are of increasing interest due to emergent Yu-Shiba-Rusinov (YSR) states and Majorana zero modes for fault-tolerant quantum computation. However, a direct relationship between the YSR multiple states and magnetic anisotropy splitting of quantum impurity spins remains poorly characterized. By using scanning tunneling microscopy, we systematically resolve individual transition-metal (Fe, Cr, and Ni) impurities induced YSR multiplets as well as their Zeeman effects in the KC superconductor. The YSR multiplets show identical d orbital-like wave functions that are symmetry-mismatched to the threefold KC(1 1 1) host surface, breaking point-group symmetries of the spatial distribution of YSR bound states in real space. Remarkably, we identify an unprecedented fermion-parity-preserving quantum phase transition between ground states with opposite signs of the uniaxial magnetic anisotropy that can be manipulated by an external magnetic field. These findings can be readily understood in terms of anisotropy splitting of quantum impurity spins, and thus elucidate the intricate interplay between the magnetic anisotropy and YSR multiplets.

Identical wave functions Magnetic anisotropy Quantum phase transition Quantum spin YSR multiplets Zeeman effects

SCI ; EI

英语

其他

2-s2.0-85189785292

Scopus

1.State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing,100084,China
2.Vacuum Interconnected Nanotech Workstation,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou,215123,China
3.Frontier Science Center for Quantum Information,Beijing,100084,China
4.Beijing Academy of Quantum Information Sciences,Beijing,100193,China
5.Southern University of Science and Technology,Shenzhen,518055,China

Wang，Shu Ze,Yu，Xue Qing,Wei，Li Xuan,et al. Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K3C60[J]. Science Bulletin,2024,69(10):1392-1399.

Wang，Shu Ze.,Yu，Xue Qing.,Wei，Li Xuan.,Wang，Li.,Cheng，Qiang Jun.,...&Song，Can Li.(2024).Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K3C60.Science Bulletin,69(10),1392-1399.

Wang，Shu Ze,et al."Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K3C60".Science Bulletin 69.10(2024):1392-1399.