| Title | Observation of In-Plane Quantum Griffiths Singularity in Two-Dimensional Crystalline Superconductors |
| Authors | Liu, Yi Qi, Shichao Fang, Jingchao Sun, Jian Liu, Chong Liu, Yanzhao Qi, Junjie Xing, Ying Liu, Haiwen Lin, Xi Wang, Lili Xue, Qi-Kun Xie, X. C. Wang, Jian |
| Affiliation | Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China China Univ Petr, Coll New Energy & Mat, Dept Mat Sci & Engn, Beijing 102249, Peoples R China Beijing Normal Univ, Ctr Adv Quantum Studies, Dept Phys, Beijing 100875, Peoples R China Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China |
| Keywords | METAL TRANSITION |
| Issue Date | 24-Sep-2021 |
| Publisher | PHYSICAL REVIEW LETTERS |
| Abstract | Quantum Griffiths singularity (QGS) reveals the profound influence of quenched disorder on the quantum phase transitions, characterized by the divergence of the dynamical critical exponent at the boundary of the vortex glasslike phase, named as quantum Griffiths phase. However, in the absence of vortices, whether the QGS can exist under a parallel magnetic field remains a puzzle. Here, we study the magnetic field induced superconductor-metal transition in ultrathin crystalline PdTe2 films grown by molecular beam epitaxy. Remarkably, the QGS emerges under both perpendicular and parallel magnetic field in four-monolayer PdTe2 films. The direct activated scaling analysis with a new irrelevant correction has been proposed, providing important evidence of QGS. With increasing film thickness to six monolayers, the QGS disappears under perpendicular field but persists under parallel field, and this discordance may originate from the differences in microscopic processes. Our work demonstrates the universality of parallel field induced QGS and can stimulate further investigations on novel quantum phase transitions under parallel magnetic field. |
| URI | http://hdl.handle.net/20.500.11897/626599 |
| ISSN | 0031-9007 |
| DOI | 10.1103/PhysRevLett.127.137001 |
| Indexed | SCI(E) |
| Appears in Collections: | 量子材料科学中心 |
