Low-energy optical properties of the nonmagnetic kagome metal

E. Uykur; B. R. Ortiz; O. Iakutkina; M. Wenzel; S. D. Wilson; M. Dressel; A. A. Tsirlin

doi:10.1103/PhysRevB.104.045130

Low-energy optical properties of the nonmagnetic kagome metal

E. Uykur, B. R. Ortiz, O. Iakutkina, M. Wenzel, S. D. Wilson, M. Dressel, A. A. Tsirlin

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

Temperature-dependent reflectivity measurements on the kagome metal in a broad frequency range of down to =10 K are reported. The charge-density wave (CDW) formed below = 94 K manifests itself in a prominent spectral-weight transfer from low to higher energy regions. The CDW gap of 60-75 meV is observed at the lowest temperature and shows significant deviations from an isotropic BCS-type mean-field behavior. Absorption peaks appear at frequencies as low as 200 and can be identified with interband transitions according to density-functional calculations. The change in the interband absorption compared to reflects the inversion of band saddle points between the K and Cs compounds. Additionally, a broader and strongly temperature-dependent absorption feature is observed below 1000 and assigned to a displaced Drude peak. It reflects localization effects on charge carriers.

Original language	English
Article number	045130
Journal	Physical Review B
Volume	104
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.104.045130
State	Published - Jul 15 2021
Externally published	Yes

Funding

Authors acknowledge the fruitful discussion with S. Fratini and technical support by G. Untereiner. S.D.W. and B.R.O. gratefully acknowledge support via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under Award No. DMR-1906325. B.R.O. also acknowledges support from the California NanoSystems Institute through the Elings fellowship program. The work in Stuttgart has been supported by the Deutsche Forschungsgemeinschaft (DFG) via DR228/51-1 and UY63/2-1. E.U. acknowledges the European Social Fund and the Baden-Württemberg Stiftung for the financial support of this research project by the Eliteprogramme. A.T. was supported by the Federal Ministry for Education and Research via the Sofja Kovalevskaya Award of Alexander von Humboldt Foundation. National Science Foundation Deutsche Forschungsgemeinschaft Alexander von Humboldt-Stiftung Bundesministerium f?r Bildung, Wissenschaft, Forschung und Technologie

Access to Document

10.1103/PhysRevB.104.045130

Cite this

@article{e68a2bcf64404d009fb76d8503fbf7cf,

title = "Low-energy optical properties of the nonmagnetic kagome metal",

abstract = "Temperature-dependent reflectivity measurements on the kagome metal in a broad frequency range of down to =10 K are reported. The charge-density wave (CDW) formed below = 94 K manifests itself in a prominent spectral-weight transfer from low to higher energy regions. The CDW gap of 60-75 meV is observed at the lowest temperature and shows significant deviations from an isotropic BCS-type mean-field behavior. Absorption peaks appear at frequencies as low as 200 and can be identified with interband transitions according to density-functional calculations. The change in the interband absorption compared to reflects the inversion of band saddle points between the K and Cs compounds. Additionally, a broader and strongly temperature-dependent absorption feature is observed below 1000 and assigned to a displaced Drude peak. It reflects localization effects on charge carriers.",

author = "E. Uykur and Ortiz, {B. R.} and O. Iakutkina and M. Wenzel and Wilson, {S. D.} and M. Dressel and Tsirlin, {A. A.}",

note = "Publisher Copyright: {\textcopyright}2021 American Physical Society",

year = "2021",

month = jul,

day = "15",

doi = "10.1103/PhysRevB.104.045130",

language = "English",

volume = "104",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "4",

}

TY - JOUR

T1 - Low-energy optical properties of the nonmagnetic kagome metal

AU - Uykur, E.

AU - Ortiz, B. R.

AU - Iakutkina, O.

AU - Wenzel, M.

AU - Wilson, S. D.

AU - Dressel, M.

AU - Tsirlin, A. A.

PY - 2021/7/15

Y1 - 2021/7/15

N2 - Temperature-dependent reflectivity measurements on the kagome metal in a broad frequency range of down to =10 K are reported. The charge-density wave (CDW) formed below = 94 K manifests itself in a prominent spectral-weight transfer from low to higher energy regions. The CDW gap of 60-75 meV is observed at the lowest temperature and shows significant deviations from an isotropic BCS-type mean-field behavior. Absorption peaks appear at frequencies as low as 200 and can be identified with interband transitions according to density-functional calculations. The change in the interband absorption compared to reflects the inversion of band saddle points between the K and Cs compounds. Additionally, a broader and strongly temperature-dependent absorption feature is observed below 1000 and assigned to a displaced Drude peak. It reflects localization effects on charge carriers.

AB - Temperature-dependent reflectivity measurements on the kagome metal in a broad frequency range of down to =10 K are reported. The charge-density wave (CDW) formed below = 94 K manifests itself in a prominent spectral-weight transfer from low to higher energy regions. The CDW gap of 60-75 meV is observed at the lowest temperature and shows significant deviations from an isotropic BCS-type mean-field behavior. Absorption peaks appear at frequencies as low as 200 and can be identified with interband transitions according to density-functional calculations. The change in the interband absorption compared to reflects the inversion of band saddle points between the K and Cs compounds. Additionally, a broader and strongly temperature-dependent absorption feature is observed below 1000 and assigned to a displaced Drude peak. It reflects localization effects on charge carriers.

UR - http://www.scopus.com/inward/record.url?scp=85110582344&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.104.045130

DO - 10.1103/PhysRevB.104.045130

M3 - Article

AN - SCOPUS:85110582344

SN - 2469-9950

VL - 104

JO - Physical Review B

JF - Physical Review B

IS - 4

M1 - 045130

ER -

Low-energy optical properties of the nonmagnetic kagome metal

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this