Phonon promoted charge density wave in topological kagome metal ScV6Sn6

Hu，Yong1,2; Ma，Junzhang3,4,5; Li，Yinxiang6; Jiang，Yuxiao7; Gawryluk，Dariusz Jakub8; Hu，Tianchen9; Teyssier，Jérémie10; Multian，Volodymyr11; Yin，Zhouyi12; Xu，Shuxiang9; Shin，Soohyeon8; Plokhikh，Igor8; Han，Xinloong13; Plumb，Nicholas C.1; Liu，Yang14; Yin，Jia Xin15; Guguchia，Zurab16; Zhao，Yue12; Schnyder，Andreas P.17; Wu，Xianxin18; Pomjakushina，Ekaterina8; Hasan，M. Zahid7; Wang，Nanlin9,19,20; Shi，Ming1,13

2024-12-01

10.1038/s41467-024-45859-y

Nature Communications   影响因子和分区

2041-1723

Charge density wave (CDW) orders in vanadium-based kagome metals have recently received tremendous attention, yet their origin remains a topic of debate. The discovery of ScVSn, a bilayer kagome metal featuring an intriguing 3×3×3 CDW order, offers a novel platform to explore the underlying mechanism behind the unconventional CDW. Here, we combine high-resolution angle-resolved photoemission spectroscopy, Raman scattering and density functional theory to investigate the electronic structure and phonon modes of ScVSn. We identify topologically nontrivial surface states and multiple van Hove singularities (VHSs) in the vicinity of the Fermi level, with one VHS aligning with the in-plane component of the CDW vector near the K¯ point. Additionally, Raman measurements indicate a strong electron-phonon coupling, as evidenced by a two-phonon mode and new emergent modes. Our findings highlight the fundamental role of lattice degrees of freedom in promoting the CDW in ScVSn.

SCI

英语

其他

2-s2.0-85185975111

Scopus

1.Photon Science Division,Paul Scherrer Institut,Villigen PSI,CH-5232,Switzerland
2.Center of Quantum Materials and Devices and Department of Applied Physics,Chongqing University,Chongqing,401331,China
3.Department of Physics,City University of Hong Kong,Kowloon,Hong Kong
4.City University of Hong Kong Shenzhen Research Institute,Shenzhen,China
5.Hong Kong Institute for Advanced Study,City University of Hong Kong,Kowloon,Hong Kong
6.College of Science,University of Shanghai for Science and Technology,Shanghai,200093,China
7.Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7),Department of Physics,Princeton University,Princeton,United States
8.Laboratory for Multiscale Materials Experiments,Paul Scherrer Institut,Villigen PSI,CH-5232,Switzerland
9.International Center for Quantum Materials,School of Physics,Peking University,Beijing,100871,China
10.Department of Quantum Matter Physics,University of Geneva,Geneva 4,24 Quai Ernest-Ansermet,1211,Switzerland
11.Advanced Materials Nonlinear Optical Diagnostics lab,Institute of Physics,Kyiv,NAS of Ukraine, 46 Nauky pr.,03028,Ukraine
12.Institute for Quantum Science and Engineering and Department of Physics,Southern University of Science and Technology of China,Shenzhen,Guangdong,518055,China
13.Kavli Institute for Theoretical Sciences,University of Chinese Academy of Sciences,Beijing,100190,China
14.Center for Correlated Matter and Department of Physics,Zhejiang University,Hangzhou,310058,China
15.Department of physics,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
16.Laboratory for Muon Spin Spectroscopy,Paul Scherrer Institute,Villigen PSI,CH-5232,Switzerland
17.Max-Planck-Institut für Festkörperforschung,Stuttgart,Heisenbergstrasse 1,D-70569,Germany
18.CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing,100190,China
19.Beijing Academy of Quantum Information Sciences,Beijing,100913,China
20.Collaborative Innovation Center of Quantum Matter,Beijing,100871,China

Hu，Yong,Ma，Junzhang,Li，Yinxiang,et al. Phonon promoted charge density wave in topological kagome metal ScV6Sn6[J]. Nature Communications,2024,15(1).

Hu，Yong.,Ma，Junzhang.,Li，Yinxiang.,Jiang，Yuxiao.,Gawryluk，Dariusz Jakub.,...&Shi，Ming.(2024).Phonon promoted charge density wave in topological kagome metal ScV6Sn6.Nature Communications,15(1).

Hu，Yong,et al."Phonon promoted charge density wave in topological kagome metal ScV6Sn6".Nature Communications 15.1(2024).