Evidence for a spinon Kondo effect in cobalt atoms on single-layer 1T-TaSe2

被引：36

作者：

Chen, Yi ^{[1
,2
,3
,4
]}

He, Wen-Yu ^{[5
,6
]}

Ruan, Wei ^{[1
,2
,7
,8
]}

Hwang, Jinwoong ^{[9
,10
,11
,12
]}

Tang, Shujie ^{[9
,10
,11
,13
,14
,15
]}

Lee, Ryan L. ^{[1
,16
,17
]}

Wu, Meng ^{[1
,2
]}

Zhu, Tiancong ^{[1
,2
]}

Zhang, Canxun ^{[1
,2
,18
,19
]}

Ryu, Hyejin ^{[9
,20
]}

Wang, Feng ^{[1
,2
,18
,19
]}

Louie, Steven G. ^{[1
,2
]}

Shen, Zhi-Xun ^{[10
,11
,13
,14
]}

Mo, Sung-Kwan ^{[9
]}

Lee, Patrick A. ^{[5
]}

Crommie, Michael F. ^{[1
,2
,18
,19
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA

[3] Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing, Peoples R China

[4] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

[5] MIT, Dept Phys, Cambridge, MA 02139 USA

[6] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai, Peoples R China

[7] Fudan Univ, State Key Lab Surface Phys, Shanghai, Peoples R China

[8] Fudan Univ, Dept Phys, Shanghai, Peoples R China

[9] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA USA

[10] Stanford Inst Mat & Energy Sci, SLAC Natl Accelerator Lab, Menlo Pk, CA USA

[11] Stanford Univ, Menlo Pk, CA USA

[12] Kangwon Natl Univ, Dept Phys, Chunchon, South Korea

[13] Stanford Univ, Dept Phys, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[14] Stanford Univ, Dept Appl Phys, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[15] Chinese Acad Sci, CAS Ctr Excellence Superconducting Elect, Shanghai Inst Microsyst & Informat Technol, Shanghai, Peoples R China

[16] Princeton Univ, Joseph Henry Labs, Princeton, NJ 08544 USA

[17] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[18] Univ Calif Berkeley, Kavli Energy Nano Sci Inst, Berkeley, CA 94720 USA

[19] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[20] Korea Inst Sci & Technol, Ctr Spintron, Seoul, South Korea

来源：

NATURE PHYSICS | 2022年 / 18卷 / 11期

基金：

美国国家科学基金会; 上海市科技启明星计划; 新加坡国家研究基金会;

关键词：

MOTT INSULATOR; LIQUID; EVOLUTION; IMPURITY;

D O I：

10.1038/s41567-022-01751-4

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum spin liquids are highly entangled, disordered magnetic states that are expected to arise in frustrated Mott insulators and to exhibit exotic fractional excitations such as spinons and chargons. Despite being electrical insulators, some quantum spin liquids are predicted to exhibit gapless itinerant spinons that yield metallic behaviour in the charge-neutral spin channel. We deposited isolated magnetic atoms onto single-layer 1T-TaSe2, a candidate gapless spin liquid, to probe how itinerant spinons couple to impurity spin centres. Using scanning tunnelling spectroscopy, we observe the emergence of new, impurity-induced resonance peaks at the 1T-TaSe2 Hubbard band edges when cobalt adatoms are positioned to have maximal spatial overlap with the local charge distribution. These resonance peaks disappear when the spatial overlap is reduced or when the magnetic impurities are replaced with nonmagnetic impurities. Theoretical simulations of a modified Anderson impurity model show that the observed peaks are consistent with a Kondo resonance induced by spinons combined with spin-charge binding effects that arise due to fluctuations of an emergent gauge field. Unconventional quasiparticles carrying spin but not electric charge emerge in quantum spin liquid phases. The Kondo interaction of these spinon quasiparticles with magnetic impurities may now have been observed.

引用

页码：1335 / +

页数：8

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