Discovery of a Cooper-pair density wave state in a transition-metal dichalcogenide

doi:10.1126/science.abd4607

GSTDTAP > 气候变化

DOI	10.1126/science.abd4607
	Discovery of a Cooper-pair density wave state in a transition-metal dichalcogenide
	Xiaolong Liu; Yi Xue Chong; Rahul Sharma; J. C. Séamus Davis
	2021-06-25
发表期刊	Science
出版年	2021
英文摘要	Among the most intriguing of the many phases of cuprate superconductors is the so-called pair density wave (PDW) state. PDW is characterized by a spatially modulated density of Cooper pairs and can be detected with a scanning tunneling microscope equipped with a superconducting tip. Liu et al. used Josephson tunneling microscopy, modified for the task, to detect PDW in niobium diselenide, a superconductor with a layered hexagonal structure. The PDW state is expected to appear in other transition metal dichalcogenides as well. Science , abd4607, this issue p. [1447][1] Pair density wave (PDW) states are defined by a spatially modulating superconductive order parameter. To search for such states in transition-metal dichalcogenides (TMDs), we used high-speed atomic-resolution scanned Josephson-tunneling microscopy. We detected a PDW state whose electron-pair density and energy gap modulate spatially at the wave vectors of the preexisting charge density wave (CDW) state. The PDW couples linearly to both the s -wave superconductor and the CDW and exhibits commensurate domains with discommensuration phase slips at the boundaries, conforming those of the lattice-locked commensurate CDW. Nevertheless, we found a global δΦ≅±2π/3 phase difference between the PDW and CDW states, possibly owing to the Cooper-pair wave function orbital content. Our findings presage pervasive PDW physics in the many other TMDs that sustain both CDW and superconducting states. [1]: /lookup/doi/10.1126/science.abd4607
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/334146
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Xiaolong Liu,Yi Xue Chong,Rahul Sharma,et al. Discovery of a Cooper-pair density wave state in a transition-metal dichalcogenide[J]. Science,2021.
APA	Xiaolong Liu,Yi Xue Chong,Rahul Sharma,&J. C. Séamus Davis.(2021).Discovery of a Cooper-pair density wave state in a transition-metal dichalcogenide.Science.
MLA	Xiaolong Liu,et al."Discovery of a Cooper-pair density wave state in a transition-metal dichalcogenide".Science (2021).