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Lozanov VV, Baklanova NI, Bannykh DA, Titov AT. Effect of Antimony on the Reaction of Hafnium Diboride with Iridium. RUSS J INORG CHEM+ 2022. [DOI: 10.1134/s0036023622601052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Yang T, Ding S, Liu Y, Wu Z, Zhang G. An ideal Weyl nodal ring with a large drumhead surface state in the orthorhombic compound TiS 2. Phys Chem Chem Phys 2022; 24:8208-8216. [PMID: 35319049 DOI: 10.1039/d2cp00424k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Topological metals or semimetals have attracted great research attention and interest in condensed matter physics and chemistry due to their exotic properties. Different from the conventional topological insulators, topological metals or semimetals are characterized by distinct topological surface states, such as a Fermi arc or a drumhead surface state, which are often used in experiments to verify the corresponding topological properties. However, the current study in this field is strongly limited in the experimental characterization because of the extreme lack of perfect material candidates with a clean band structure and clear surface states. In this work, based on theoretical calculations, we propose a new topological semimetal TiS2, which has an orthorhombic structure and exhibits excellent stability. Calculated electronic band structures reveal that there is a single Weyl nodal ring in the ky = 0 plane. A detailed symmetry analysis is provided and the corresponding surface state is calculated, which exhibits both a large energy variation of 1.5 eV and wide space distribution without and with the spin orbit coupling effect. Besides, the surface states are well separated from the bulk state. These ideal features together make TiS2 a promising nodal line semimetal for experimental investigation. In combination with the other two isostructural compounds TiSe2 and TiTe2 with similar properties, their further experimental synthesis and characterization can be highly expected and the corresponding study for the topological nodal line state can thus be greatly facilitated.
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Affiliation(s)
- Tie Yang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.,School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
| | - Shoubing Ding
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
| | - Ying Liu
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Zhimin Wu
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
| | - Gang Zhang
- Institute of High Performance Computing, Agency for Science, Technology and Research, Connexis, 138632, Singapore.
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3
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Han Y, Liu Y, Wang J, Yang T, Zhou F, Kuang M, Wang X, Zhang G. Strain-induced quantum phase transition in the C 3Sc 4 monolayer: towards multiple gapless fermions. NANOSCALE 2021; 13:9723-9731. [PMID: 34019045 DOI: 10.1039/d1nr00382h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Most two dimensional (2D) topological materials host only one kind of fermionic state. However, realizing multiple gapless fermions in a single 2D material is rarely reported. Furthermore, researchers face challenges in regulating various gapless fermion transitions using specific methods. Herein, we perform a study based on the first-principles calculation to investigate the electronic structures and the related fermionic states of strained 2D C3Sc4. C3Sc4 is an ideal system in the ground state with twelve Dirac points. The dynamical, mechanical, and thermal stabilities of the proposed C3Sc4 monolayer are demonstrated in detail. Interestingly, under the condition of 9.5% biaxial tensile strain, gapless and quadratic Weyl fermionic states are observed at the Γ point. A gapless and massless pseudospin-1 fermion appears at the Γ point in the 2D C3Sc4 system under 13% biaxial tensile strain and with hole doping. The Fermi velocity of this massless pseudospin-1 fermion is 2.1 × 105 m s-1, comparable to that of well-known 2D gapless topological materials. The results indicate that 2D C3Sc4 is an ideal playground to explore interesting behaviors of quantum phase transitions and rich gapless fermionic states and also reveal its potential applications in high-speed nano-devices.
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Affiliation(s)
- Yilin Han
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
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Li Y, Xia J, Khenata R, Kuang M. First-principle investigation of all types of topological nodal lines in a realistic P6 3/mmc type titanium selenide. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:285505. [PMID: 33412521 DOI: 10.1088/1361-648x/abd999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Topological nodal line (TNL) materials with one-dimensional band-crossing points (BCPs) exhibit interesting electronic characteristics and have special applications in electronic devices. Normally, based on the slopes of the crossing bands, the BCPs can be divided into two types, i.e., type I and type II nodal points. Based on the combination of the different types of nodal points, the nodal lines (NLs) can be divided into three categories: (i) type I NL, type II NL, and hybrid NL, these being formed by type I nodal points, type II nodal points, and type I and II nodal points, respectively. Compared with the large number of predicted type I NL materials, there are less type II and hybrid NL materials. In this study, it is predicted that P63/mmc type TiSe metal is a topological material which exhibits all types of NL states. Furthermore, the dynamic stability as well as the effect of spin-orbit coupling on the topological signatures are examined. Also, the nontrivial surface states are shown to provide evidence for the occurrence of the NL states. This novel material can be seen as a good platform to use for further investigations on the three types of NLs and diverse fermions.
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Affiliation(s)
- Yang Li
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Jihong Xia
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Rabah Khenata
- Laboratoire de Physique Quantique de la Matiere et de Modelisation Mathematique (LPQ3M), Universite de Mascara, Mascara 29000, Algeria
| | - Minquan Kuang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, People's Republic of China
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Zhou F, Liu Y, Kuang M, Wang P, Wang J, Yang T, Wang X, Cheng Z, Zhang G. Time-reversal-breaking Weyl nodal lines in two-dimensional A 3C 2 (A = Ti, Zr, and Hf) intrinsically ferromagnetic materials with high Curie temperature. NANOSCALE 2021; 13:8235-8241. [PMID: 33885113 DOI: 10.1039/d1nr00139f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Most materials that feature nontrivial band topology are spin-degenerate and three dimensional, strongly restricting them from application in spintronic nanodevices. Hence, two-dimensional (2D) intrinsically spin-polarized systems with rich topological elements are still in extreme scarcity. Here, 2D A3C2 (A = Ti, Zr, and Hf) materials with the P6[combining macron]m2 type structure are reported as new ferromagnetic materials with intrinsic magnetism and good stability. Unlike the Weyl nodal lines existing in nonmagnetic 2D systems, A3C2 hosts time-reversal-breaking Weyl nodal rings (two Γ-centered, one K-centered, and one K'-centered) without spin-orbit coupling (SOC). These nodal rings still remained under SOC with magnetization along the z direction (easy magnetization axis). More interestingly, the Curie temperatures (TC) of A3C2 were determined based on the Monte Carlo simulation. Ti3C2 features an extraordinary TC (above 800 K), and those of Zr3C2 and Hf3C2 are above room temperature. Therefore, A3C2 materials are excellent platforms to study magnetic Weyl nodal lines in high TC ferromagnetic 2D materials.
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Affiliation(s)
- Feng Zhou
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
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Xu H, Xi H, Gao YC. Hexagonal Zr 3X (X = Al, Ga, In) Metals: High Dynamic Stability, Nodal Loop, and Perfect Nodal Surface States. Front Chem 2020; 8:608398. [PMID: 33330404 PMCID: PMC7710705 DOI: 10.3389/fchem.2020.608398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 09/30/2020] [Indexed: 11/25/2022] Open
Abstract
In recent years, topological semimetals/metals, including nodal point, nodal line, and nodal surface semimetals/metals, have been studied extensively because of their potential applications in spintronics and quantum computers. In this study, we predict a family of materials, Zr3X (X = Al, Ga, In), hosting the nodal loop and nodal surface states in the absence of spin–orbit coupling. Remarkably, the energy variation of the nodal loop and nodal surface states in Zr3X are very small, and these topological signatures lie very close to the Fermi level. When the effect of spin–orbit coupling is considered, the nodal loop and nodal surface states exhibit small energy gaps (<25 and 35 meV, respectively) that are suitable observables that reflect the spin-orbit coupling response of these topological signatures and can be detected in experiments. Moreover, these compounds are dynamically stable, and they consequently form potential material platforms to study nodal loop and nodal surface semimetals.
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Affiliation(s)
- Heju Xu
- College of Science, North China University of Science and Technology, Tangshan, China
| | - Hailong Xi
- College of Science, North China University of Science and Technology, Tangshan, China
| | - Yong-Chun Gao
- College of Science, North China University of Science and Technology, Tangshan, China
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Xu H. Realization of Opened and Closed Nodal Lines and Four- and Three-fold Degenerate Nodal Points in XPt (X = Sc, Y, La) Intermetallic Compound: A Computational Modeling Study. Front Chem 2020; 8:609118. [PMID: 33251188 PMCID: PMC7674926 DOI: 10.3389/fchem.2020.609118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 10/12/2020] [Indexed: 11/13/2022] Open
Abstract
Realizing rich topological elements in topological materials has attracted increasing attention in the fields of chemistry, physics, and materials science. Topological semimetals/metals are classified into three main types: nodal-point, nodal-line, and nodal-surface types with zero-, one-, and two-dimensional topological elements, respectively. This study reports that XPt (X = Sc, Y, La) intermetallic compounds are topological metals with opened and closed nodal lines, and triply degenerate nodal points (TNPs) when the spin-orbit coupling (SOC) is ignored. Based on the calculated phonon dispersions, one can find that ScPt and YPt are dynamically stable whereas LaPt is not. When SOC is added, the one-dimensional nodal line and zero-dimensional TNPs disappear. Interestingly, a new zero-dimensional topological element, that is, Dirac points with 4-fold degenerate isolated band crossings with linear band dispersion appear. The proposed materials can be considered a good platform to realize zero- and one-dimensional topological elements in a single compound and to study the relationship between zero- and one-dimensional topological elements.
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Affiliation(s)
- Heju Xu
- College of Science, North China University of Science and Technology, Tangshan, China
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Li Y, Xia J, Khenata R, Kuang M. Perfect Topological Metal CrB 2: A One-Dimensional (1D) Nodal Line, a Zero-Dimensional (0D) Triply Degenerate Point, and a Large Linear Energy Range. MATERIALS 2020; 13:ma13194321. [PMID: 32998339 PMCID: PMC7579166 DOI: 10.3390/ma13194321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 09/20/2020] [Accepted: 09/23/2020] [Indexed: 11/16/2022]
Abstract
Topological materials with band-crossing points exhibit interesting electronic characteristics and have special applications in electronic devices. However, to further facilitate the experimental detection of the signatures of these band crossings, topological materials with a large linear energy range around the band-crossing points need to be found, which is challenging. Here, via first-principle approaches, we report that the previously prepared P6/mmm-type CrB2 material is a topological metal with one pair of 1D band-crossing points, that is, nodal lines, in the kz= 0 plane, and one pair of 0D band-crossing points, that is, triple points, along the A–Γ–A’ paths. Remarkably, around these band-crossing points, a large linear energy range (larger than 1 eV) was found and the value was much larger than that found in previously studied materials with a similar linear crossing. The pair of nodal lines showed obvious surface states, which show promise for experimental detection. The effect of the spin–orbit coupling on the band-crossing points was examined and the gaps induced by spin–orbit coupling were found to be up to 69 meV. This material was shown to be phase stable in theory and was synthesized in experiments, and is therefore a potential material for use in investigating nodal lines and triple points.
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Affiliation(s)
- Yang Li
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, China
- Correspondence: (Y.L.); ; (J.X.); (R.K.); (M.K.)
| | - Jihong Xia
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, China
- Correspondence: (Y.L.); ; (J.X.); (R.K.); (M.K.)
| | - Rabah Khenata
- Laboratoire de Physique Quantique de la Matiere et de Modelisation Mathematique (LPQ3M), Universite de Mascara, Mascara 29000, Algeria
- Correspondence: (Y.L.); ; (J.X.); (R.K.); (M.K.)
| | - Minquan Kuang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
- Correspondence: (Y.L.); ; (J.X.); (R.K.); (M.K.)
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Zhang L, Wang K. Pure Zirconium: Type II Nodal Line and Nodal Surface States. Front Chem 2020; 8:585753. [PMID: 33173771 PMCID: PMC7538698 DOI: 10.3389/fchem.2020.585753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 08/17/2020] [Indexed: 11/29/2022] Open
Abstract
Type II nodal line states have novel properties, such as direction-reliant chiral anomalies and high anisotropic negative magneto-resistance. These type II nodal line states have been widely investigated. Compared to nodal line materials, there are far fewer proposed nodal surface materials, and furthermore, a very recent challenge is to find a realistic material that co-exhibits both nodal line and nodal surface states. In this manuscript, we present the study of the electronic and topological states of pure zirconium within the density functional theory. We found that pure Zr is an interesting material that rarely exhibits both the type II nodal line state (in kz = 0 plane) and nodal surface state (in kz = π plane). The nontrivial topological states are explained based on the orbital-resolved band structures. Our study shows that pure Zr can serve as a new platform to investigate the interplay between the nodal line state and the nodal surface state.
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Affiliation(s)
- Li Zhang
- Changchun Institute of Technology, Changchun, China
| | - Kai Wang
- Engineering Research Center (ERC), Harbin Medical University, Harbin, China
- Nanoscience and Technology Center, The Fourth Medical College of Harbin Medical University, Harbin, China
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Li Y, Xia J, Khenata R, Kuang M. Insight into the Topological Nodal Line Metal YB 2 with Large Linear Energy Range: A First-Principles Study. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E3841. [PMID: 32878132 PMCID: PMC7503759 DOI: 10.3390/ma13173841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 08/27/2020] [Accepted: 08/27/2020] [Indexed: 11/17/2022]
Abstract
The presence of one-dimensional (1D) nodal lines, which are formed by band crossing points along a line in the momentum space of materials, is accompanied by several interesting features. However, in order to facilitate experimental detection of the band crossing point signatures, the materials must possess a large linear energy range around the band crossing points. In this work, we focused on a topological metal, YB2, with phase stability and a P6/mmm space group, and studied the phonon dispersion, electronic structure, and topological nodal line signatures via first principles. The computed results show that YB2 is a metallic material with one pair of closed nodal lines in the kz = 0 plane. Importantly, around the band crossing points, a large linear energy range in excess of 2 eV was observed, which was rarely reported in previous reports that focus on linear-crossing materials. Furthermore, YB2 has the following advantages: (1) An absence of a virtual frequency for phonon dispersion, (2) an obvious nontrivial surface state around the band crossing point, and (3) small spin-orbit coupling-induced gaps for the band crossing points.
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Affiliation(s)
- Yang Li
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, China
- Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Jihong Xia
- Department of Physics, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Rabah Khenata
- Laboratoire de Physique Quantique de la Matiere et de Modelisation Mathematique (LPQ3M), Universite de Mascara, Mascara 29000, Algeria;
| | - Minquan Kuang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
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Wang X, Cheng Z, Zhang G, Kuang M, Wang XL, Chen H. Strain tuning of closed topological nodal lines and opposite pockets in quasi-two-dimensional α-phase FeSi 2. Phys Chem Chem Phys 2020; 22:13650-13658. [PMID: 32519682 DOI: 10.1039/d0cp02334e] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Following topological nodal point semimetals, topological nodal line semimetals with one dimensional (1D) topological elements have recently aroused great interest worldwide in the fields of quantum chemistry and condensed matter physics. In this study, by means of first-principles, we predict that quasi-two-dimensional (2D) α-FeSi2 with a P4/mmm space group is a topological nodal line semimetal with two nodal lines close to the Fermi level, in the kz = 0 and kz = π planes. Usually, topological nodal line semimetals can be classified into type I, type II, and hybrid-type categories, each type with different physical properties. Importantly, for the first time, we find that type I, type II, and hybrid-type nodal lines can be realized in a realistic material, i.e., quasi-2D α-FeSi2, by strain switching. The realization of tunable nodal line types occurs because quasi-2D α-FeSi2 has special opposite-pocket-behaving bands around the Fermi level. The results presented herein reflect that α-FeSi2 is a valuable candidate for spintronics application by utilization of type I, type II, and hybrid-type topological nodal line semimetals in a single material tuned by mechanical strain.
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Affiliation(s)
- Xiaotian Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
| | - Gang Zhang
- Institute of High Performance Computing, Agency for Science, Technology and Research (A*STAR), 138632, Singapore.
| | - Minquan Kuang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
| | - Xiao-Lin Wang
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
| | - Hong Chen
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
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