Robust three-dimensional type-II Dirac semimetal state in SrAgBi

Hu, Zhixiang; Deng, Junze; Li, Hang; Ogunbunmi, Michael O.; Tong, Xiao; Wang, Qi; Graf, David; Pudełko, Wojciech Radoslaw; Liu, Yu; Lei, Hechang; Bobev, Svilen; Radović, M.; Wang, Zhijun; Petrović, C.

doi:10.1038/s41535-023-00549-8

Cited by 7 publications

(1 citation statement)

References 64 publications

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“…Finally, we proceed to examine the hexagonal AE Ag Pn ( AE = Ca, Sr, Ba; Pn = Sb, Bi), 216,217 wherein observation of the TDSM state is prevalent. 218–221 A key aspect of these materials, which can be described as Zintl phases with coinage metals, is their low lattice thermal conductivity that drives their excellent TE properties. 222,223 For example, studies on the CaAgSb phase with the TiNiSi-type 224 indicate a transition into the LiGaGe-type phase 225 upon substituting some of Ag for Zn to give CaAg x Zn (1− x )/2 Sb with attendant ultralow lattice thermal conductivity of (∼0.4 W m −1 K −1 ) for CaAg 0.2 Zn 0.4 Sb between 300 K to 773 K. 226 The results further indicate the presence of an all-scale hierarchical structure that supports effective phonon scattering over a wide frequency range.…”

Section: Intuitions Developed From Some Known and Newly Discovered Zi...mentioning

confidence: 99%

Exploiting the fraternal twin nature of thermoelectrics and topological insulators in Zintl phases as a tool for engineering new efficient thermoelectric generators

Ogunbunmi

Bobev

2023

J. Mater. Chem. C

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Section: Intuitions Developed From Some Known and Newly Discovered Zi...mentioning

confidence: 99%

Exploiting the fraternal twin nature of thermoelectrics and topological insulators in Zintl phases as a tool for engineering new efficient thermoelectric generators

Ogunbunmi

Bobev

2023

J. Mater. Chem. C

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Two‐Dimensional Layered Topological Semimetals for Advanced Electronics and Optoelectronics

Yu,

Zeng,

Zhang

et al. 2024

Adv Funct Materials

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Due to the outstanding physical properties and the integrated characteristics, such as the gapless band structure, high state density, high conductivity, dangling‐bond‐free surface, and tunable Fermi level, two‐dimensional layered topological semimetals (2D LTSMs) exhibit a promising application prospect for including electrode contact and terahertz detection. Despite the surging in attention, a comprehensive strategy is still crucial to meet the necessary conditions for the practical application of 2D LTSMs. According to the fermion types and the band structures, 2D LTSMs can be divided into Dirac semimetals, Weyl semimetals, and nodal‐line semimetals. This review comprehensively encapsulates the intrinsic properties, typical synthesis methods, and applications in electronics and optoelectronics about these 2D LTSMs. To establish the fundamental theory, typical crystal structures, and physical properties of different 2D LTSMs are summarized at first. The effective synthesis strategies including exfoliation, molecular beam epitaxy, and vapor deposition are analyzed systematically. Finally, the article emphasizes the exploration of applications, significant challenges, and promising development directions of 2D LTSMs, which will drive 2D LTSMs to become the promisingly leading technology for next‐generation electronic and optoelectronic systems.

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Crystal and electronic structure of the ternary Zintl bismuthide BaLiBi

Ovchinnikov,

Bobev

2023

Zeitschrift anorg allge chemie

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Reported is the accurate refinement of the structure of the ternary bismuthide BaLiBi, based on single‐crystal X‐ray diffraction data. This compound crystallizes with the ZrBeSi structure type with the space group P63/mmc (no. 194), a = 4.9917(6) Å, c = 9.079(2) Å, V = 195.92(7) Å3 with two formula units per unit cell. In addition to being a colored ternary variant of the AlB2 type, the crystal structure of BaLiBi can be also viewed as a “stuffed” variant of the NiAs structure, where the Bi atoms form a hexagonal close packing, the Ba atoms occupy the octahedral voids in this packing, and the Li atoms are located between adjacent tetrahedral voids on their common triangular faces. In the absence of direct Bi–Bi interactions, the BaLiBi crystal structure rationalized according to the notation (Ba2+)(Li+)(Bi3–), suggesting an electron‐balanced composition, i.e., a Zintl phase. In line with this notation, scalar‐relativistic first‐principle calculations with the LMTO code reveal a semiconducting ground state, with a bandgap of about 0.6 eV. Fully relativistic electronic structure calculations predict a semimetallic ground state.

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Robust three-dimensional type-II Dirac semimetal state in SrAgBi

Cited by 7 publications

References 64 publications

Exploiting the fraternal twin nature of thermoelectrics and topological insulators in Zintl phases as a tool for engineering new efficient thermoelectric generators

Exploiting the fraternal twin nature of thermoelectrics and topological insulators in Zintl phases as a tool for engineering new efficient thermoelectric generators

Two‐Dimensional Layered Topological Semimetals for Advanced Electronics and Optoelectronics

Crystal and electronic structure of the ternary Zintl bismuthide BaLiBi

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