Phononic second-order topological phase in the 
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 compound

Huang, Feizhen; Zhou, Pan; Li, W. Q.; He, Shuang; Tan, Rui; Ma, Zengsheng; Sun, L. Z.

doi:10.1103/physrevb.107.134104

Cited by 9 publications

(1 citation statement)

References 69 publications

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“…FeSe is a possible HOTI with antiferromagnetic order [332,334]. Besides electronic 2D HOTIs, the phononic conterparts are also predicted in C 3 N [344], graphyne [340] and graphdiyne [338]. Most recently, the authors of [345] propose TiSiCO family monolayers as a new class of 2D HOTIs for which the corner degree of freedom can be controlled by electric and optical fields and might have potential applications in novel electronic devices.…”

Section: Solid State Materialsmentioning

confidence: 99%

Higher-order topological phases in crystalline and non-crystalline systems: a review

Yang,

Wang,

et al. 2024

J. Phys.: Condens. Matter

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In recent years, higher-order topological phases have attracted great interest in various fields of physics. These phases have protected boundary states at lower-dimensional boundaries than the conventional first-order topological phases due to the higher-order bulk-boundary correspondence. In this review, we summarize current research progress on higher-order topological phases in both crystalline and non-crystalline systems. We firstly introduce prototypical models of higher-order topological phases in crystals and their topological characterizations. We then discuss effects of quenched disorder on higher-order topology and demonstrate disorder-induced higher-order topological insulators. We also review the theoretical studies on higher-order topological insulators in amorphous systems without any crystalline symmetry and higher-order topological phases in non-periodic lattices including quasicrystals, hyperbolic lattices, and fractals, which have no crystalline counterparts. We conclude the review by a summary of experimental realizations of higher-order topological phases and discussions on potential directions for future study.

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Section: Solid State Materialsmentioning

confidence: 99%

Higher-order topological phases in crystalline and non-crystalline systems: a review

Yang,

Wang,

et al. 2024

J. Phys.: Condens. Matter

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Magnetic Second‐Order Topological Insulator: An Experimentally Feasible 2D CrSiTe₃

Wang

et al. 2023

Adv Funct Materials

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Abstract2D second‐order topological insulators (SOTIs) have sparked significant interest, but currently, the proposed realistic 2D materials for SOTIs are limited to nonmagnetic systems. In this study, for the first time, a single layer of chalcogenide CrSiTe3—an experimentally realized transition metal trichalcogenide is proposed with a layer structure—as a 2D ferromagnetic (FM) SOTI. Based on first‐principles calculations, this study confirms that the CrSiTe3 monolayer exhibits a nontrivial gapped bulk state in the spin‐up channel and a trivial gapped bulk state in the spin‐down channel. Based on the higher‐order bulk–boundary correspondence, it demonstrates that the CrSiTe3 monolayer exhibits topologically protected corner states with a quantized fractional charge () in the spin‐up channel. Notably, unlike previous nonmagnetic examples, the topological corner states of the CrSiTe3 monolayer are spin‐polarized and pinned at the corners of the sample in real space. Furthermore, the CrSiTe3 monolayer retains SOTI features when the spin–orbit coupling (SOC) is considered, as evidenced by the corner charge and corner states distribution. Finally, by applying biaxial strain and hole doping, this study transforms the magnetic insulating bulk states into spin‐gapless semiconducting and half‐metallic bulk states, respectively. Importantly, the topological corner states persist in the spin‐up channel under these conditions.

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Topological Phonons and Thermoelectric Conversion in Crystalline Materials

Ding,

Zeng,

Liu

et al. 2024

Adv Funct Materials

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Topological phononics, a fascinating frontier in condensed matter physics, holds great promise for advancing energy‐related applications. Topologically nontrivial phonons typically possess gapless edge or surface states. These exotic states of lattice vibrations, characterized by their nontrivial topology, offer unique opportunities for manipulating and harnessing energy transport. The exploration of topological phonons opens new avenues in understanding and controlling thermal transport properties, with potential applications in fields such as thermoelectric materials, phononic devices, and waste heat recovery. Here, an overview of concepts such as Berry curvature and topological invariants, along with the applications of phonon tight‐binding method and nonequilibrium Green's function method in the field of topological phononics is provided. This review encompasses the latest research progress of various topological phonon states within crystalline materials, including topological optical phonons, topological acoustical phonons, and higher‐order topological phonons. Furthermore, the study delves into the prospective applications of topological phonons in the realm of thermoelectric conversion, focusing on aspects like size effects and symmetry engineering.

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Phononic second-order topological phase in the C3N compound

Cited by 9 publications

References 69 publications

Higher-order topological phases in crystalline and non-crystalline systems: a review

Higher-order topological phases in crystalline and non-crystalline systems: a review

Magnetic Second‐Order Topological Insulator: An Experimentally Feasible 2D CrSiTe₃

Topological Phonons and Thermoelectric Conversion in Crystalline Materials

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Phononic second-order topological phase in the C3N compound

Cited by 9 publications

References 69 publications

Higher-order topological phases in crystalline and non-crystalline systems: a review

Higher-order topological phases in crystalline and non-crystalline systems: a review

Magnetic Second‐Order Topological Insulator: An Experimentally Feasible 2D CrSiTe3

Topological Phonons and Thermoelectric Conversion in Crystalline Materials

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Product

Resources

About

Magnetic Second‐Order Topological Insulator: An Experimentally Feasible 2D CrSiTe₃