Large kagome family candidates with topological superconductivity and charge density waves

Yi, Xin-Wei; Ma, Xingyu; Zhang, Zhen; Zheng-Wei, Liao,; You, Jing-Yang; Su, Gang

doi:10.1103/physrevb.106.l220505

Cited by 25 publications

(12 citation statements)

References 56 publications

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“…4d, seems compatible with experiments on ScV 6 Sn 6 [20]. The analysis we have performed might be relevant also for other kagome metals that might be discovered in the future [102][103][104][105].…”

Section: Discussionsupporting

confidence: 85%

Theory of nematic charge orders in kagome metals

Grandi¹,

Consiglio²,

Sentef³

et al. 2023

Preprint

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Kagome metals AV3Sb5 (A =K, Rb, Cs) exhibit an exotic charge order (CO), involving three order parameters, with broken translation and time-reversal symmetries compatible with the presence of orbital currents. Despite the tremendous experimental and theoretical efforts that have been invested into the characterization of this phase, its properties are still intensely debated, and it is unclear if the origin of the CO is mainly due to electron-electron or electron-phonon interactions. One of the few indications that are confirmed by the majority of experimental studies is the nematicity of this state, a feature that might be enhanced by electronic correlations irrespective of the nature of the primary instability. However, it is still unclear whether the nematic CO becomes stable at a temperature equal to (Tnem = TC) or lower than (Tnem < TC) the one of the CO itself. Here, we systematically characterize several CO configurations, some proposed for the new member of the family ScV6Sn6, by combining phenomenological Ginzburg-Landau theories, valid irrespective of the specific ordering mechanism, with mean-field analysis. We find a few configurations for the CO that are in agreement with most of the experimental findings to date and that are described by different Ginzburg-Landau potentials. Moreover, we propose to use resonant ultrasound spectroscopy to experimentally characterize the properties of the order parameters of the CO, such as the number of their components and their relative amplitude, and provide an analysis of the corresponding elastic tensors. This might help understand which mean-field configuration found in our study is the most representative for describing the CO state of kagome metals, and it can provide information regarding the nematicity onset temperature Tnem with respect to TC.

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Section: Discussionsupporting

confidence: 85%

Theory of nematic charge orders in kagome metals

Grandi¹,

Consiglio²,

Sentef³

et al. 2023

Preprint

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“…The trivial bands overlapping with topological Dirac bands allow the identification of a Z 2 topological metal, which is essential for the coexistence of topological and superconducting properties. 50 A material with both surface topological Dirac cones and bulk superconductivity may intrinsically establish the proximity effect, which has promising applications. 51 According to the bulk-edge correspondence, the nonzero Z 2 = 1 invariant is closely related to the nontrivial helical edge states that emerge inside the gap between two energy bands in a semi-infinite system.…”

Section: Resultsmentioning

confidence: 99%

Interplay of the charge density wave transition with topological and superconducting properties

et al. 2023

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“…In addition to the AV 3 Sb 5 family, different strongly-correlated states are possible in a related Dirac-kagome herbertsmithite metal [13]. Ab initio calculations also reveal the existence of a closely related family of kagome superconductors with promising rich behavior [14].…”

mentioning

confidence: 95%

Strain-induced topological transitions and tilted Dirac cones in kagome lattices

Mojarro,

Ulloa

2023

2D Mater.

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We study effects of strain on the electronic properties of the kagome lattice in a tight-binding formalism with spin–orbit coupling (SOC). The degeneracy at the Γ point evolves into a pair of emergent tilted Dirac cones under uniaxial strain, where the anisotropy and tilting of the bands depend on the magnitude and direction of the strain field. SOC opens gaps at the emergent Dirac points, making the flatband topological, characterized by a nontrivial Z 2 index. Strains of a few percent drive the system into trivial or topological phases. This confirms that moderate strain can be used to engineer anisotropic Dirac bands with tunable properties to study new phases in kagome lattices.

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Large kagome family candidates with topological superconductivity and charge density waves

Cited by 25 publications

References 56 publications

Theory of nematic charge orders in kagome metals

Theory of nematic charge orders in kagome metals

Interplay of the charge density wave transition with topological and superconducting properties

Strain-induced topological transitions and tilted Dirac cones in kagome lattices

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