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Coexistence of two intertwined charge density waves in a kagome system

Li, Cong ; Wu, Xianxin ; Liu, Hongxiong ; Polley, Craig LU ; Guo, Qinda ; Wang, Yang ; Han, Xinloong ; Dendzik, Maciej ; Berntsen, Magnus H. and Thiagarajan, Balasubramanian LU , et al. (2022) In Physical Review Research 4(3).
Abstract

Materials with a kagome lattice structure display a wealth of intriguing magnetic properties due to their geometric frustration and intrinsically flat band structure. Recently, topological and superconducting states have also been observed in kagome systems. The kagome lattice may also host a "breathing"mode that leads to charge density wave (CDW) states, if there is strong electron-phonon coupling, electron-electron interaction, or external excitation of the material. This "breathing"mode can give rise to candidate distortions such as the star of David (SoD) or its inverse structure [trihexagonal (TrH)]. To date, in most materials, only a single type of distortion has been observed. Here, we present angle-resolved photoemission... (More)

Materials with a kagome lattice structure display a wealth of intriguing magnetic properties due to their geometric frustration and intrinsically flat band structure. Recently, topological and superconducting states have also been observed in kagome systems. The kagome lattice may also host a "breathing"mode that leads to charge density wave (CDW) states, if there is strong electron-phonon coupling, electron-electron interaction, or external excitation of the material. This "breathing"mode can give rise to candidate distortions such as the star of David (SoD) or its inverse structure [trihexagonal (TrH)]. To date, in most materials, only a single type of distortion has been observed. Here, we present angle-resolved photoemission spectroscopy measurements on the kagome superconductor CsV3Sb5 at multiple temperatures and photon energies to reveal the nature of the CDW in this material. It is shown that CsV3Sb5 displays two intertwined CDW orders corresponding to the SoD and TrH distortions. These two distinct types of distortions are stacked along the c direction to form a three-dimensional CDW order where the two 2-fold CDWs are phase shifted along the c axis. The presented results provide not only key insights into the nature of the unconventional CDW order in CsV3Sb5, but also an important reference for further studies on the relationship between the CDW and superconducting order.

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type
Contribution to journal
publication status
published
subject
in
Physical Review Research
volume
4
issue
3
article number
033072
pages
10 pages
publisher
American Physical Society
external identifiers
  • scopus:85135898025
ISSN
2643-1564
DOI
10.1103/PhysRevResearch.4.033072
language
English
LU publication?
yes
id
47747dd7-afaf-4616-b29c-d75361a93675
date added to LUP
2022-11-02 14:40:50
date last changed
2023-09-11 05:10:08
@article{47747dd7-afaf-4616-b29c-d75361a93675,
  abstract     = {{<p>Materials with a kagome lattice structure display a wealth of intriguing magnetic properties due to their geometric frustration and intrinsically flat band structure. Recently, topological and superconducting states have also been observed in kagome systems. The kagome lattice may also host a "breathing"mode that leads to charge density wave (CDW) states, if there is strong electron-phonon coupling, electron-electron interaction, or external excitation of the material. This "breathing"mode can give rise to candidate distortions such as the star of David (SoD) or its inverse structure [trihexagonal (TrH)]. To date, in most materials, only a single type of distortion has been observed. Here, we present angle-resolved photoemission spectroscopy measurements on the kagome superconductor CsV<sub>3</sub>Sb<sub>5</sub> at multiple temperatures and photon energies to reveal the nature of the CDW in this material. It is shown that CsV<sub>3</sub>Sb<sub>5</sub> displays two intertwined CDW orders corresponding to the SoD and TrH distortions. These two distinct types of distortions are stacked along the c direction to form a three-dimensional CDW order where the two 2-fold CDWs are phase shifted along the c axis. The presented results provide not only key insights into the nature of the unconventional CDW order in CsV<sub>3</sub>Sb<sub>5</sub>, but also an important reference for further studies on the relationship between the CDW and superconducting order.</p>}},
  author       = {{Li, Cong and Wu, Xianxin and Liu, Hongxiong and Polley, Craig and Guo, Qinda and Wang, Yang and Han, Xinloong and Dendzik, Maciej and Berntsen, Magnus H. and Thiagarajan, Balasubramanian and Shi, Youguo and Schnyder, Andreas P. and Tjernberg, Oscar}},
  issn         = {{2643-1564}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Research}},
  title        = {{Coexistence of two intertwined charge density waves in a kagome system}},
  url          = {{http://dx.doi.org/10.1103/PhysRevResearch.4.033072}},
  doi          = {{10.1103/PhysRevResearch.4.033072}},
  volume       = {{4}},
  year         = {{2022}},
}