Evidence for quantum spin liquid behaviour in single-layer 1T-TaSe2 from scanning tunnelling microscopy

doi:10.1038/s41567-021-01321-0

	Evidence for quantum spin liquid behaviour in single-layer 1T-TaSe2 from scanning tunnelling microscopy
	Ruan, Wei 1,2,3; Chen, Yi 1,2; Tang, Shujie4,5,6,7,8,9 ; Hwang, Jinwoong 4,5,7,10; Tsai, Hsin-Zon 1,11; Lee, Ryan L.2; Wu, Meng 1,2; Ryu, Hyejin 7,12; Kahn, Salman 2; Liou, Franklin 2; Jia, Caihong 1,2,13; Aikawa, Andrew 2; Hwang, Choongyu 10; Wang, Feng 1,2,14,15; Choi, Yongseong 16; Louie, Steven G.1,2; Lee, Patrick A.17; Shen, Zhi-Xun 4,5,6; Mo, Sung-Kwan 7; Crommie, Michael F.1,2,14,15
	2021
发表期刊	NATURE PHYSICS
ISSN	1745-2473
EISSN	1745-2481
DOI	10.1038/s41567-021-01321-0
摘要	Some quantum spin liquids are expected to have an effective Fermi surface of fractionalized spinon excitations. The two-dimensional spin liquid candidate 1T-TaSe2 has charge density modulations that may be caused by an unstable spinon Fermi surface. Two-dimensional triangular-lattice antiferromagnets are predicted under some conditions to exhibit a quantum spin liquid ground state with no energy barrier to create emergent, fractionalized spinon excitations that carry spin but no charge. Materials that realize this kind of spin liquid are expected to have a low-energy behaviour described by a spinon Fermi surface. Directly imaging the resulting spinons, however, is difficult due to their chargeless nature. Here we use scanning tunnelling spectroscopy to image density waves consistent with the predictions of spinon density modulation arising from a spinon Fermi surface instability in single-layer 1T-TaSe2. We confirm the existence of a triangular lattice of localized spins in this material by contacting it with a metallic 1H-TaSe2 substrate and measuring the Kondo effect. Spectroscopic imaging of isolated single-layer 1T-TaSe2 reveals long-wavelength super-modulations at Hubbard band energies, consistent with the predicted behaviour of itinerant spinons. These super-modulations allow the direct experimental measurement of the spinon Fermi wavevector, in good agreement with theoretical predictions for a two-dimensional quantum spin liquid.
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收录类别	SCIE ; EI
语种	英语
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000686522600001
出版者	NATURE PORTFOLIO
原始文献类型	Article; Early Access
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/128046
专题	物质科学与技术学院
通讯作者	Crommie, Michael F.
作者单位	1.Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA; 2.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA; 3.Fudan Univ, Dept Phys, Shanghai, Peoples R China; 4.SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA USA; 5.Stanford Univ, Menlo Pk, CA USA; 6.Stanford Univ, Dept Phys & Appl Phys, Geballe Lab Adv Mat, Stanford, CA USA; 7.Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA USA; 8.Chinese Acad Sci, CAS Ctr Excellence Superconducting Elect, Shanghai Inst Microsyst & Informat Technol, Shanghai, Peoples R China; 9.Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai, Peoples R China; 10.Pusan Natl Univ, Dept Phys, Busan, South Korea; 11.Shenzhen Univ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Engn Technol Res Ctr 2D Mat Informat Funct Device, Minist Educ, Shenzhen, Peoples R China; 12.Korea Inst Sci & Technol, Ctr Spintron, Seoul, South Korea; 13.Henan Univ, Ctr Topol Funct Mat, Henan Key Lab Photovolta Mat, Kaifeng, Peoples R China; 14.Univ Calif Berkeley, Kavli Energy NanoSci Inst, Berkeley, CA 94720 USA; 15.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA; 16.Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA; 17.MIT, Dept Phys, Cambridge, MA 02139 USA
推荐引用方式 GB/T 7714	Ruan, Wei,Chen, Yi,Tang, Shujie,et al. Evidence for quantum spin liquid behaviour in single-layer 1T-TaSe2 from scanning tunnelling microscopy[J]. NATURE PHYSICS,2021.
APA	Ruan, Wei.,Chen, Yi.,Tang, Shujie.,Hwang, Jinwoong.,Tsai, Hsin-Zon.,...&Crommie, Michael F..(2021).Evidence for quantum spin liquid behaviour in single-layer 1T-TaSe2 from scanning tunnelling microscopy.NATURE PHYSICS.
MLA	Ruan, Wei,et al."Evidence for quantum spin liquid behaviour in single-layer 1T-TaSe2 from scanning tunnelling microscopy".NATURE PHYSICS (2021).