Coexistence of two intertwined charge density waves in a kagome systemShow others and affiliations
2022 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 4, no 3, article id 033072Article in journal (Refereed) Published
Abstract [en]
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.
Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 4, no 3, article id 033072
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-316303DOI: 10.1103/PhysRevResearch.4.033072ISI: 000832492300010Scopus ID: 2-s2.0-85135898025OAI: oai:DiVA.org:kth-316303DiVA, id: diva2:1686869
Note
QC 20220811
2022-08-112022-08-112023-05-10Bibliographically approved