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Devescovi C, Morales-Pérez A, Hwang Y, García-Díez M, Robredo I, Luis Mañes J, Bradlyn B, García-Etxarri A, Vergniory MG. Axion topology in photonic crystal domain walls. Nat Commun 2024; 15:6814. [PMID: 39122685 PMCID: PMC11316128 DOI: 10.1038/s41467-024-50766-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 07/19/2024] [Indexed: 08/12/2024] Open
Abstract
Axion insulators are 3D magnetic topological insulators supporting hinge states and quantized magnetoelectric effects, recently proposed for detecting dark-matter axionic particles via their axionic excitations. Beyond theoretical interest, obtaining a photonic counterpart of axion insulators offers potential for advancing magnetically-tunable photonic devices and axion haloscopes based on axion-photon conversion. This work proposes an axionic 3D phase within a photonic setup. By building inversion-symmetric domain-walls in gyrotropic photonic crystals, we bind chiral modes on inversion-related hinges, ultimately leading to the realization of an axionic channel of light. These states propagate embedded in a 3D structure, thus protected from radiation in the continuum. Employing a small external gyromagnetic bias, we transition across different axionic mode configurations, enabling effective topological switching of chiral photonic fibers. While demonstrating the possibility of realizing axion photonic crystals within state-of-the-art gyrotropic setups, we propose a general scheme for rendering axion topology at domain walls of Weyl semimetals.
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Affiliation(s)
- Chiara Devescovi
- Institute for Theoretical Physics, ETH Zurich, 8093, Zürich, Switzerland.
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, Donostia-San Sebastian, Spain.
| | - Antonio Morales-Pérez
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, Donostia-San Sebastian, Spain.
- Material and Applied Physics Department, University of the Basque Country (UPV/EHU), Donostia-San Sebastian, Spain.
| | - Yoonseok Hwang
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Mikel García-Díez
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, Donostia-San Sebastian, Spain
- Physics Department, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | - Iñigo Robredo
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, Donostia-San Sebastian, Spain
- Max Planck Institute for Chemical Physics of Solids, D-01187, Dresden, Germany
| | - Juan Luis Mañes
- Physics Department, University of the Basque Country (UPV/EHU), Bilbao, Spain
| | - Barry Bradlyn
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Aitzol García-Etxarri
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, Donostia-San Sebastian, Spain.
- IKERBASQUE, Basque Foundation for Science, María Díaz de Haro 3, 48013, Bilbao, Spain.
| | - Maia G Vergniory
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, Donostia-San Sebastian, Spain.
- Max Planck Institute for Chemical Physics of Solids, D-01187, Dresden, Germany.
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2
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Park H, Oh SS, Lee S. Surface potential-adjusted surface states in 3D topological photonic crystals. Sci Rep 2024; 14:7173. [PMID: 38531983 PMCID: PMC11344842 DOI: 10.1038/s41598-024-56894-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 03/12/2024] [Indexed: 03/28/2024] Open
Abstract
Surface potential in a topological matter could unprecedentedly localize the waves. However, this surface potential is yet to be exploited in topological photonic systems. Here, we demonstrate that photonic surface states can be induced and controlled by the surface potential in a dielectric double gyroid (DG) photonic crystal. The basis translation in a unit cell enables tuning of the surface potential, which in turn regulates the degree of wave localization. The gradual modulation of DG photonic crystals enables the generation of a pseudomagnetic field. Overall, this study shows the interplay between surface potential and pseudomagnetic field regarding the surface states. The physical consequences outlined herein not only widen the scope of surface states in 3D photonic crystals but also highlight the importance of surface treatments in a photonic system.
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Affiliation(s)
- Haedong Park
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea.
- School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA, UK.
| | - Sang Soon Oh
- School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA, UK.
| | - Seungwoo Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea.
- Department of Biomicrosystem Technology, Korea University, Seoul, 02841, Republic of Korea.
- Department of Integrative Energy Engineering and KU Photonics Center, Korea University, Seoul, 02841, Republic of Korea.
- Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea.
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3
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Mazzei Capote GA, Montoya-Ospina MC, Liu Z, Mattei MS, Liu B, Delgado AP, Yu Z, Goldsmith RH, Osswald TA. Compounding a High-Permittivity Thermoplastic Material and Its Applicability in Manufacturing of Microwave Photonic Crystals. MATERIALS 2022; 15:ma15072492. [PMID: 35407825 PMCID: PMC8999560 DOI: 10.3390/ma15072492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/18/2022] [Accepted: 03/24/2022] [Indexed: 11/16/2022]
Abstract
Additive Manufacturing (AM) techniques allow the production of complex geometries unattainable through other traditional technologies. This advantage lends itself well to rapidly iterating and improving upon the design of microwave photonic crystals, which are structures with intricate, repeating features. The issue tackled by this work involves compounding a high-permittivity material that can be used to produce 3D microwave photonic structures using polymer extrusion-based AM techniques. This material was acrylonitrile butadiene styrene (ABS)-based and used barium titanate (BaTiO3) ceramic as the high-permittivity component of the composite and involved the use of a surfactant and a plasticizer to facilitate processing. Initial small amounts of the material were compounded using an internal batch mixer and studied using polymer thermal analysis techniques, such as thermogravimetric analysis, rheometry, and differential scanning calorimetry to determine the proper processing conditions. The production of the material was then scaled up using a twin-screw extruder system, producing homogeneous pellets. Finally, the thermoplastic composite was used with a screw-based, material extrusion additive manufacturing technique to produce a slab for measuring the relative permittivity of the material, as well as a preliminary 3D photonic crystal. The real part of the permittivity was measured to be 12.85 (loss tangent = 0.046) in the range of 10 to 12 GHz, representing the highest permittivity ever demonstrated for a thermoplastic AM composite at microwave frequencies.
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Affiliation(s)
- Gerardo Andres Mazzei Capote
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (M.C.M.-O.); (Z.L.); (T.A.O.)
- Correspondence:
| | - Maria Camila Montoya-Ospina
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (M.C.M.-O.); (Z.L.); (T.A.O.)
| | - Zijie Liu
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (M.C.M.-O.); (Z.L.); (T.A.O.)
| | - Michael Sabatini Mattei
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA; (M.S.M.); (A.P.D.); (R.H.G.)
| | - Boyuan Liu
- Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (B.L.); (Z.Y.)
| | - Aidan P. Delgado
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA; (M.S.M.); (A.P.D.); (R.H.G.)
| | - Zongfu Yu
- Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (B.L.); (Z.Y.)
| | - Randall H. Goldsmith
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA; (M.S.M.); (A.P.D.); (R.H.G.)
| | - Tim Andreas Osswald
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (M.C.M.-O.); (Z.L.); (T.A.O.)
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4
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Devescovi C, García-Díez M, Robredo I, Blanco de Paz M, Lasa-Alonso J, Bradlyn B, Mañes JL, G. Vergniory M, García-Etxarri A. Cubic 3D Chern photonic insulators with orientable large Chern vectors. Nat Commun 2021; 12:7330. [PMID: 34921142 PMCID: PMC8683445 DOI: 10.1038/s41467-021-27168-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 11/04/2021] [Indexed: 11/10/2022] Open
Abstract
Time Reversal Symmetry (TRS) broken topological phases provide gapless surface states protected by topology, regardless of additional internal symmetries, spin or valley degrees of freedom. Despite the numerous demonstrations of 2D topological phases, few examples of 3D topological systems with TRS breaking exist. In this article, we devise a general strategy to design 3D Chern insulating (3D CI) cubic photonic crystals in a weakly TRS broken environment with orientable and arbitrarily large Chern vectors. The designs display topologically protected chiral and unidirectional surface states with disjoint equifrequency loops. The resulting crystals present the following characteristics: First, by increasing the Chern number, multiple surface states channels can be supported. Second, the Chern vector can be oriented along any direction simply changing the magnetization axis, opening up larger 3D CI/3D CI interfacing possibilities as compared to 2D. Third, by lowering the TRS breaking requirements, the system is ideal for realistic photonic applications where the magnetic response is weak.
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Affiliation(s)
- Chiara Devescovi
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, Donostia-San Sebastián, Spain.
| | - Mikel García-Díez
- grid.452382.a0000 0004 1768 3100Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain ,grid.11480.3c0000000121671098Physics Department, University of the Basque Country (UPV-EHU), Bilbao, Spain
| | - Iñigo Robredo
- grid.452382.a0000 0004 1768 3100Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain ,grid.11480.3c0000000121671098Physics Department, University of the Basque Country (UPV-EHU), Bilbao, Spain
| | - María Blanco de Paz
- grid.452382.a0000 0004 1768 3100Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
| | - Jon Lasa-Alonso
- grid.452382.a0000 0004 1768 3100Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain ,grid.482265.f0000 0004 1762 5146Centro de Física de Materiales, Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastian, Spain
| | - Barry Bradlyn
- grid.35403.310000 0004 1936 9991Department of Physics and Institute for Condensed Matter Theory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-3080 USA
| | - Juan L. Mañes
- grid.11480.3c0000000121671098Physics Department, University of the Basque Country (UPV-EHU), Bilbao, Spain
| | - Maia G. Vergniory
- grid.452382.a0000 0004 1768 3100Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain ,grid.424810.b0000 0004 0467 2314IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain ,grid.419507.e0000 0004 0491 351XMax Planck Institute for Chemical Physics of Solids, Dresden, D-01187 Germany
| | - Aitzol García-Etxarri
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018, Donostia-San Sebastián, Spain. .,IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013, Bilbao, Spain.
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5
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Chen Y, Wang HX, Bao Q, Jiang JH, Chen H. Ideal type-II Weyl points in twisted one-dimensional dielectric photonic crystals. OPTICS EXPRESS 2021; 29:40606-40616. [PMID: 34809396 DOI: 10.1364/oe.444780] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Accepted: 11/10/2021] [Indexed: 06/13/2023]
Abstract
We proposed an one-dimensional layer-stacked photonic crystal using anisotropic materials to realize ideal type-II Weyl points. The topological transition from Dirac to Weyl points can be clearly observed by tuning the twist angle between layers. Also, on the interface between the photonic type-II Weyl material and air, gapless surface states have been demonstrated in an incomplete bulk bandgap. By breaking parameter symmetry, these ideal type-II Weyl points would transform into the non-ideal ones, exhibiting topological surface states with single group velocity. Our work may provide a new idea for the realization of photonic semimetal phases by utilizing naturally anisotropic materials.
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6
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Vaidya S, Benalcazar WA, Cerjan A, Rechtsman MC. Point-Defect-Localized Bound States in the Continuum in Photonic Crystals and Structured Fibers. PHYSICAL REVIEW LETTERS 2021; 127:023605. [PMID: 34296895 DOI: 10.1103/physrevlett.127.023605] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 06/07/2021] [Indexed: 06/13/2023]
Abstract
We show that point defects in two-dimensional photonic crystals can support bound states in the continuum (BICs). The mechanism of confinement is a symmetry mismatch between the defect mode and the Bloch modes of the photonic crystal. These BICs occur in the absence of band gaps and therefore provide an alternative mechanism to confine light. Furthermore, we show that such BICs can propagate in a fiber geometry and exhibit arbitrarily small group velocity which could serve as a platform for enhancing nonlinear effects and light-matter interactions in structured fibers.
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Affiliation(s)
- Sachin Vaidya
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Wladimir A Benalcazar
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Alexander Cerjan
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque 87123, New Mexico, USA
| | - Mikael C Rechtsman
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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7
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Kim M, Jacob Z, Rho J. Recent advances in 2D, 3D and higher-order topological photonics. LIGHT, SCIENCE & APPLICATIONS 2020; 9:130. [PMID: 32704363 PMCID: PMC7371865 DOI: 10.1038/s41377-020-0331-y] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 04/21/2020] [Accepted: 05/07/2020] [Indexed: 05/25/2023]
Abstract
Over the past decade, topology has emerged as a major branch in broad areas of physics, from atomic lattices to condensed matter. In particular, topology has received significant attention in photonics because light waves can serve as a platform to investigate nontrivial bulk and edge physics with the aid of carefully engineered photonic crystals and metamaterials. Simultaneously, photonics provides enriched physics that arises from spin-1 vectorial electromagnetic fields. Here, we review recent progress in the growing field of topological photonics in three parts. The first part is dedicated to the basics of topological band theory and introduces various two-dimensional topological phases. The second part reviews three-dimensional topological phases and numerous approaches to achieve them in photonics. Last, we present recently emerging fields in topological photonics that have not yet been reviewed. This part includes topological degeneracies in nonzero dimensions, unidirectional Maxwellian spin waves, higher-order photonic topological phases, and stacking of photonic crystals to attain layer pseudospin. In addition to the various approaches for realizing photonic topological phases, we also discuss the interaction between light and topological matter and the efforts towards practical applications of topological photonics.
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Affiliation(s)
- Minkyung Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673 Republic of Korea
| | - Zubin Jacob
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47906 USA
| | - Junsuk Rho
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673 Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673 Republic of Korea
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8
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Yin Z, Chen F, Guo K, Shen F, Zhou K, Gao J, Liu S, Guo Z. Tunable THz generalized Weyl points. OPTICS EXPRESS 2019; 27:512-522. [PMID: 30696136 DOI: 10.1364/oe.27.000512] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 12/30/2018] [Indexed: 06/09/2023]
Abstract
Weyl points, as linearly double degenerated point of band structures, have been extensively researched in electronic and classical wave systems. However, Weyl points' realization is always accompanied with delicate "lattice structures". In this work, frequency-tunable terahertz (THz) generalized Weyl points inside the parameter space have been investigated and displayed by a specially designed photonic crystal with polydimethylsiloxane (PDMS) immersed in 4-cyano'-pentylbipenyl (5CB) liquid crystals (LCs). The reflective phase vortices as a signature of the generalized Weyl points are observed through our numerically simulations. Besides, interface states between photonic crystals and any reflective substrates are fulfilled too. Meanwhile, we could also change the orientation of LC molecule by the external magnetic field so as to tune the frequency of the first two bands' Weyl point from 0.27698THz to 0.30013THz. This band lies in the short-range wireless communication. Thus, our proposal may be beneficial to the investigation and application of Weyl points' properties and strongly localized states.
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9
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Watanabe H, Lu L. Space Group Theory of Photonic Bands. PHYSICAL REVIEW LETTERS 2018; 121:263903. [PMID: 30636163 DOI: 10.1103/physrevlett.121.263903] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Indexed: 06/09/2023]
Abstract
The wide-range application of photonic crystals and metamaterials benefits from the enormous design space of three-dimensional subwavelength structures. In this Letter, we study the space group constraints on photonic dispersions for all 230 space groups with time-reversal symmetry. Our theory carefully treats the unique singular point of photonic bands at zero frequency and momentum, which distinguishes photonic bands from their electronic counterpart. The results are given in terms of minimal band connectivities at zero (M) and nonzero frequencies (M^{'}). Topological band degeneracies are guaranteed to be found in space groups that do not allow band gaps between the second and third photonic bands (M>2). Our Letter provides theoretical guidelines for the choice of spatial symmetries in photonics design.
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Affiliation(s)
- Haruki Watanabe
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - Ling Lu
- Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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Xie BY, Wang HF, Zhu XY, Lu MH, Wang ZD, Chen YF. Photonics meets topology. OPTICS EXPRESS 2018; 26:24531-24550. [PMID: 30469568 DOI: 10.1364/oe.26.024531] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 08/20/2018] [Indexed: 06/09/2023]
Abstract
The topological phases in materials have been studied in recent decades for their unique boundary states and transport properties. Photonic systems with band structures embrace the topological phases closely, where they not only provide platforms to testify the topological band theory, but also shed light on designing novel optical devices. In this review, we present exciting developments, supported by brief descriptions of prominent milestones of topological phases in photonic systems in recent years. These studies may sustain further developments of optical devices and offer novel methods for light manipulations.
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Fruchart M, Jeon SY, Hur K, Cheianov V, Wiesner U, Vitelli V. Soft self-assembly of Weyl materials for light and sound. Proc Natl Acad Sci U S A 2018; 115:E3655-E3664. [PMID: 29610349 PMCID: PMC5910856 DOI: 10.1073/pnas.1720828115] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Soft materials can self-assemble into highly structured phases that replicate at the mesoscopic scale the symmetry of atomic crystals. As such, they offer an unparalleled platform to design mesostructured materials for light and sound. Here, we present a bottom-up approach based on self-assembly to engineer 3D photonic and phononic crystals with topologically protected Weyl points. In addition to angular and frequency selectivity of their bulk optical response, Weyl materials are endowed with topological surface states, which allow for the existence of one-way channels, even in the presence of time-reversal invariance. Using a combination of group-theoretical methods and numerical simulations, we identify the general symmetry constraints that a self-assembled structure has to satisfy to host Weyl points and describe how to achieve such constraints using a symmetry-driven pipeline for self-assembled material design and discovery. We illustrate our general approach using block copolymer self-assembly as a model system.
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Affiliation(s)
- Michel Fruchart
- Lorentz Institute, Leiden University, Leiden 2300 RA, The Netherlands;
| | - Seung-Yeol Jeon
- Center for Computational Science, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Kahyun Hur
- Center for Computational Science, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Vadim Cheianov
- Lorentz Institute, Leiden University, Leiden 2300 RA, The Netherlands
| | - Ulrich Wiesner
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14850
| | - Vincenzo Vitelli
- Lorentz Institute, Leiden University, Leiden 2300 RA, The Netherlands;
- Department of Physics, The University of Chicago, Chicago, IL 60637
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12
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Yang Z, Xiao M, Gao F, Lu L, Chong Y, Zhang B. Weyl points in a magnetic tetrahedral photonic crystal: erratum. OPTICS EXPRESS 2017; 25:23725. [PMID: 29041324 DOI: 10.1364/oe.25.023725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Indexed: 06/07/2023]
Abstract
We present an erratum regarding the number of space group in our paper.
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