Quantum states and intertwining phases in kagome materials

Wang, Yaojia; Wu, Heng; McCandless, Gregory T.; Chan, Julia Y.; Ali, Mazhar N.

doi:10.1038/s42254-023-00635-7

Cited by 36 publications

(12 citation statements)

References 309 publications

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“…The first step in this analysis is the identification of a geometrical motif that is common to the parent structures that serves as an interface nucleus for the formation of more complex assemblies. The Laves/CaCu 5 -type structures are made possible by the epitaxial matching of kagome layers, which are realizations of a net type that is correlated with intriguing materials properties and physics. , If we examine the atomic arrangements above and below the kagome nets in the structures, a common unit can be perceived (Figure a–c): a triple stack of hexagons staggered relative to each other that encircles a pair of atoms. Among the structures, the details of the unit vary in terms of the degree of planarity of the outer hexagons and the heights of the central atoms, but the commonality of this unit to the structures allows for a smooth transition between the Laves phase and CaCu 5 -type domains in the PuNi 3 type and other Laves/CaCu 5 -type intergrowths.…”

Section: Resultsmentioning

confidence: 99%

Toward Predicting the Assembly of Modular Intermetallics from Chemical Pressure Analysis: The Interface Nucleus Approach

Sanders,

Gressel,

Fredrickson

et al. 2024

Inorg. Chem.

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Complex intermetallic phases are often constructed from domains derived from simpler structures arranged into hierarchical assemblies. These modular arrangements offer intriguing prospects, such as the integration of the properties of distinct compounds into a single material or for the emergence of new properties from the interactions among different domains. In this article, we develop a strategy for the design of such complex structures, which we term the interface nucleus approach. Within this framework, the assembly of complex structures is facilitated by interface nuclei: geometrical motifs shared by two parent structures that serve as a region of overlap to nucleate or seed the formation of a combined structure. Our central hypothesis is that the formation of an interface between structures at these motifs creates opportunities for the relief of atomic packing stresses, as revealed by Density Functional Theory−Chemical Pressure (DFT-CP) analysis: when corresponding interatomic contacts in two structures exhibit complementarity�negative CP with positive CP or intense CP with mild CP�the intergrowth allows for a more balanced packing arrangement. To illustrate the application of the interface nucleus concept, we analyze three modular intermetallic structures, the σ-phase (FeCr), PuNi 3 , and Ca 6 Cu 6 Al 5 types. In each case, the assembly of the structure can be connected to complementary CP features in an interface nucleus shared by its parent structures, while the distribution of the interface nuclei in the parents serves to template the geometry of the overall framework. In this way, the interface nucleus approach points toward avenues for the design of modular intermetallics from the CP schemes of potential partner structures.

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Section: Resultsmentioning

confidence: 99%

Toward Predicting the Assembly of Modular Intermetallics from Chemical Pressure Analysis: The Interface Nucleus Approach

Sanders,

Gressel,

Fredrickson

et al. 2024

Inorg. Chem.

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“…[49,54] Our results not only provide a versatile platform to study topological corner states but also bring about new opportunities to explore fundamental physics arising from the interplay between momentum-space and real-space topology. Moreover, with growing interest in various realistic materials with (breathing) Kagome arrangements, [17,[22][23][24][35][36][37][38] topologically distinct corner states presented here may be applicable to other systems. Our work may also prove relevant to future photonic device applications including for example topological corner-state lasing [55] and error filtering for quantum qubits.…”

Section: Discussionmentioning

confidence: 99%

“…A typical example is the Kagome lattice, [1] which has turned into one of the most studied models in condensed matter physics, ultracold atoms, as well as DOI: 10.1002/adom.202301614 photonics. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] For instance, tremendous research efforts involving Kagome lattices have led to the understanding of a host of intriguing phenomena, ranging from the properties of fractional quantum Hall states, [3] quantum spin liquids, [4,18] charge order, and superconductivity, [9] to compact localized states, [6] anomalous Landau levels, [7,15] and flat-band exciton-polariton emission. [10] As a typical example in photonics, a Corbino-shaped Kagome lattice has been realized [12] for direct observation of flat band non-contractible loop states (NLSs) protected by real-space topology, originally predicted from the "frustrated" hopping models.…”

Section: Introductionmentioning

confidence: 99%

Observation of Topologically Distinct Corner States in “Bearded” Photonic Kagome Lattices

Song,

Bongiovanni,

et al. 2023

Advanced Optical Materials

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Kagome lattices represent an archetype of intriguing physics, attracting a great deal of interest in different branches of natural sciences, recently in the context of topological crystalline insulators. Here, two distinct classes of corner states in breathing Kagome lattices (BKLs) with “bearded” edge truncation are demonstrated, unveiling their topological origin. The in‐phase corner states are found to exist only in the topologically nontrivial regime, characterized by a nonzero bulk polarization. In contrast, the out‐of‐phase corner states appear in both topologically trivial and nontrivial regimes, either as bound states in the continuum or as in‐gap states depending on the lattice dimerization conditions. Furthermore, the out‐of‐phase corner states are highly localized, akin to flat‐band compact localized states, and they manifest both real‐ and momentum‐space topology. Experimentally, both types of corner states are observed in laser‐written photonic bearded‐edge BKLs, corroborated by numerical simulations. The results not only deepen the current understanding of topological corner modes in BKLs but also provide new insight into their physical origins, which may be applied to other topological BKL platforms beyond optics.

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“…Kagome-lattice compounds are known to exhibit unavoidable exotic topological electronic states [1][2][3][4][5][6][7]. The discovery of the charge density wave (CDW) in some of these compounds has introduced a captivating dimension to the research [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Tuning charge density wave of kagome metal ScV₆Sn₆

Yi,

Feng,

Kumar

et al. 2024

New J. Phys.

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Compounds with a kagome lattice exhibit intriguing properties and the charge density wave (CDW) adds an additional layer of interest to research on them. In this study, we investigate the temperature and magnetic field dependent electrical properties under a chemical substitution and hydrostatic pressure of ScV6Sn6, a non-magnetic charge density wave (CDW) compound. Substituting 5 % Cr at the V site or applying 1.5 GPa of pressure shifts the CDW to 50 K from 92 K. This shift is attributed to the movement of the imaginary phonon band, as revealed by the phonon dispersion relation. The longitudinal and Hall resistivities respond differently under these stimuli. The magnetoresistance (MR) maintains its quasilinear behavior under pressure, but it becomes quadratic after Cr substitution. The anomalous Hall-like behavior of the parent compound persists up to the respective CDW transition under pressure, after which it sharply declines. In contrast, the nonlinear Hall resistivity of Cr substituted compounds follows a two-band model and originates from the multi carrier effect. These results clearly highlight the role of phonon contributions in the CDW transition and call for further investigation into the origin of the anomalous Hall-like behavior in the parent compound.

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Quantum states and intertwining phases in kagome materials

Cited by 36 publications

References 309 publications

Toward Predicting the Assembly of Modular Intermetallics from Chemical Pressure Analysis: The Interface Nucleus Approach

Toward Predicting the Assembly of Modular Intermetallics from Chemical Pressure Analysis: The Interface Nucleus Approach

Observation of Topologically Distinct Corner States in “Bearded” Photonic Kagome Lattices

Tuning charge density wave of kagome metal ScV₆Sn₆

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Quantum states and intertwining phases in kagome materials

Cited by 36 publications

References 309 publications

Toward Predicting the Assembly of Modular Intermetallics from Chemical Pressure Analysis: The Interface Nucleus Approach

Toward Predicting the Assembly of Modular Intermetallics from Chemical Pressure Analysis: The Interface Nucleus Approach

Observation of Topologically Distinct Corner States in “Bearded” Photonic Kagome Lattices

Tuning charge density wave of kagome metal ScV6Sn6

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Tuning charge density wave of kagome metal ScV₆Sn₆