Distinct band reconstructions in kagome superconductor CsV$_3$Sb$_5$

Luo, Yang; Peng, Shuting; Teicher, Samuel M. L.; Huai, Linwei; Hu, Yong; Ortiz, Brenden R.; Wei, Zhiyuan; Shen, Jianchang; Ou, Zhipeng; Wang, Bingqian; Miao, Yu; Guo, Mingyao; Shi, Ming; Wilson, Stephen D.; He, Junfeng

doi:10.48550/arxiv.2106.01248

Cited by 16 publications

(21 citation statements)

References 38 publications

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“…The CDW transition also causes a faster decrease in the linewidths below T CDW . This can be understood as being due to the CDW-induced partial gapping of the Fermi surface [22][23][24][25][26], which reduces the electron-phonon interaction. The integrated peak intensity for both phonons increases upon warming, in line with increased thermal phonon populations.…”

Section: Temperature Dependencementioning

confidence: 99%

“…Because the period of the 2 × 2 superlattice matches perfectly with the Fermiology of the van Hove singularity, it is natural to ascribe the CDW transition to Fermi surface nesting [28]. The renormalization of the Fermi surface observed by infrared and angle-resolve photoemission spectroscopy supports this scenario [22][23][24][25][26]. However, the calculated electronic susceptibility lacks the expected divergence [40,41], and the effect of electron-phonon coupling may not be dismissed [40,42].…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we focus on the CsV 3 Sb 5 compound, which shows a CDW transition temperature T CDW = 94 K [12]. The transition is accompanied by appreciable partial gapping of the Fermi surface [22][23][24][25][26] and reportedly the lack of Kohn anomalies [27], although density functional theory (DFT) calculations found two phonon instabilities at the M and L points of the Brillouin zone [28][29][30]. Currently, there is still no consensus on the structural configuration of the CDW ground state.…”

Section: Introductionmentioning

confidence: 99%

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Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Liu,

Ma,

et al. 2022

Preprint

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We report Raman scattering spectroscopy of the kagome metal CsV3Sb5 to investigate its chargedensity wave (CDW) phase. Temperature-dependent measurements reveal a multitude of CDWinduced modes, in agreement with density-functional theory calculations assuming the inverse Star of David lattice distortion. They are shown to be strongly hybridized amplitude modes and zonefolded modes, different from those in other known CDW materials. These CDW modes show negligible magnetic-field dependence and a signature of c-axis CDW modulation. Reducing the thickness to tens of nanometers dramatically enhances the change in the lattice phonon parameters across the CDW transition and strengthens its first-order character, indicating sizable electronphonon coupling. Further thickness reduction leads to destruction of the crystal lattice. Our results provide essential structural information to unravel the CDW mechanism in CsV3Sb5.

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Section: Temperature Dependencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Liu,

Ma,

et al. 2022

Preprint

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“…The Kagome nets are formed by V atoms, and their stacking results in a topological Z 2 metal 5,7-9 . Its overall band structure, including multiple bulk Dirac points, has been determined by angle-resolved photoemission spectroscopy (ARPES) 7,10 . Upon cooling, the Kagome lattice undergoes a CDW transition at T CDW = 93 K [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Mixed dimensional transport in CsV$_3$Sb$_5$ single crystals

Huang¹,

Guo²,

Putzke³

et al. 2022

Preprint

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The observation of superconductivity and charge order in the Kagome-net compound CsV 3 Sb 5 has raised interest in its possible topological superconducting state. Key to this puzzle, as in any structurally layered conductor, is its effective electronic dimensionality. Here we present transport evidence for its dual nature, the coexistence of high-mobility quasi-two-dimensional Fermi surface sheets with small closed pockets that are crucial for the overall mixed dimensionality of this metal.It reflects in an unusual complete vanishing of magnetoresistance above T CDW , which increases by a factor of a million upon entering the ordered state. Quantum oscillations further confirm the presence of multiple, closed 3D pockets coexisting with the main cylinders -which take a central role in the out-of-plane transport. These results caution that the main Kagome physics may be altered when these planes are stacked in a real 3D material.

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“…The resulting CDW state is quite unusual, as it features large anomalous Hall effect [17,18], multiple energy gaps [11,19,20], and intrinsic chirality [18,21,22]. One general and hitherto unresolved issue is the clear distinction between the bulk and surface effects in the CDW state of AV 3 Sb 5 .…”

Section: Introductionmentioning

confidence: 99%

Optical study of RbV$_3$Sb$_5$: Multiple density-wave gaps and phonon anomalies

Wenzel,

Ortiz,

Wilson

et al. 2021

Preprint

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Temperature-dependent reflectivity studies on the non-magnetic kagome metal RbV3Sb5 in a broad energy range (50 cm −1 -20000 cm −1 ; 6 meV -2.5 eV) down to 10 K are reported. Below TCDW=102 K, the optical spectra demonstrate a prominent spectral-weight transfer from low to higher energies as the fingerprint of the charge-density wave (CDW) formation with the opening of a partial gap. A detailed analysis reveals two energy scales of, respectively, ∼ 100 meV and 45 meV, the latter appearing only below 50 K. Additionally, two modes at, respectively, 160 cm −1 and 430 cm −1 can be traced over the whole measured temperature range. Strong anomalies are observed for both of these modes already above TCDW with a further renormalization across TCDW, suggesting the importance of the electron-phonon coupling in RbV3Sb5 in both normal and CDW states. While the 160 cm −1 mode can be attributed to the E1u phonon, the 430 cm −1 mode could not be reproduced in our phonon calculations. The antiresonance nature of this mode gives hints for a nontrivial electron-phonon coupling in RbV3Sb5.

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Distinct band reconstructions in kagome superconductor CsV$_3$Sb$_5$

Cited by 16 publications

References 38 publications

Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Mixed dimensional transport in CsV$_3$Sb$_5$ single crystals

Optical study of RbV$_3$Sb$_5$: Multiple density-wave gaps and phonon anomalies

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