Motivated by the recent acoustically driven spin resonance studies applied to silicon vacancy centers in silicon carbide, we theoretically investigate the spin–strain interaction characterized by the defect spin-3/2 quadrupole components coupled to strain fields. Considering the C3v symmetry of the vacancy site beyond the spherical approximation, we clarify the effect of a deviation from the spherical symmetry on spin resonance transition rate, which can be changed by rotating a static magnetic field. The ratios of spin–strain coupling parameters can be evaluated from the anisotropic field-direction dependence of the transition rate using a standing or traveling surface acoustic wave. We also discuss the effect of the propagation direction of the acoustic wave tilted from the crystallographic mirror plane reflecting the C3v symmetry. The results presented here reveal the quadrupole properties inherent in spin-3/2 states and will promote the realization of the acoustically driven strain control of spin.
{"title":"Theory of Spin-Acoustic Resonance for Spin-3/2 Si Vacancy with C3[math] Site Symmetry in Silicon Carbide","authors":"Mikito Koga, Masashige Matsumoto","doi":"10.7566/jpsj.93.014703","DOIUrl":"https://doi.org/10.7566/jpsj.93.014703","url":null,"abstract":"Motivated by the recent acoustically driven spin resonance studies applied to silicon vacancy centers in silicon carbide, we theoretically investigate the spin–strain interaction characterized by the defect spin-3/2 quadrupole components coupled to strain fields. Considering the <i>C</i><sub>3</sub><i><sub>v</sub></i> symmetry of the vacancy site beyond the spherical approximation, we clarify the effect of a deviation from the spherical symmetry on spin resonance transition rate, which can be changed by rotating a static magnetic field. The ratios of spin–strain coupling parameters can be evaluated from the anisotropic field-direction dependence of the transition rate using a standing or traveling surface acoustic wave. We also discuss the effect of the propagation direction of the acoustic wave tilted from the crystallographic mirror plane reflecting the <i>C</i><sub>3</sub><i><sub>v</sub></i> symmetry. The results presented here reveal the quadrupole properties inherent in spin-3/2 states and will promote the realization of the acoustically driven strain control of spin.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"38 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138575129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We consider the n-dimensional ladder system, that is the homogeneous differential systems of the form (mathop {dot{x}}nolimits_{i} = x_{i}displaystylesum_{j = 1}^{n} ,(i + 1 - j)x_{j},quad i = 1, ldots ,n) introduced by Imai and Hirata for studying the integrability of a new class of Lotka–Volterra systems. Here we describe the dynamics of these Lotka–Volterra systems in arbitrary dimension.
{"title":"The Dynamics of the Ladder System","authors":"Jaume Llibre, Claudia Valls","doi":"10.7566/jpsj.93.014001","DOIUrl":"https://doi.org/10.7566/jpsj.93.014001","url":null,"abstract":"We consider the <i>n</i>-dimensional ladder system, that is the homogeneous differential systems of the form <tex-math space=\"preserve\" version=\"MathJax\">(mathop {dot{x}}nolimits_{i} = x_{i}displaystylesum_{j = 1}^{n} ,(i + 1 - j)x_{j},quad i = 1, ldots ,n)</tex-math> introduced by Imai and Hirata for studying the integrability of a new class of Lotka–Volterra systems. Here we describe the dynamics of these Lotka–Volterra systems in arbitrary dimension.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"96 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138575078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Genki Hayashi, Taiki Shimaiwa, Mario Okawa, Naoki Nakamura, Ryuji Higashinaka, Tatsuma D. Matsuda, Yuji Aoki, Miho Kitamura, Daisuke Shiga, Hiroshi Kumigashira, Marek Kopciuszynski, Alexey Barinov, Naurang. L. Saini, Takashi Mizokawa
We have investigated band structure of chiral IrGe4 by means of angle-resolved photoemission spectroscopy (ARPES) and band structure calculation. The band structure calculation predicts Kramers–Weyl degeneracy at the time reversal invariant momentum points. Although IrGe4 does not have a well-defined cleavage plane, we could observe momentum-dependent ARPES intensity modulations by ARPES. The ARPES intensity near the Fermi level was enhanced around the M and K points where the Ge 4p bands are located at about 0.3 eV below the Fermi level both in the calculation and in the experiment. Although the overall band dispersion of the Ge 4p and Ir 5d bands agrees with the calculation, surface states between the Kramers–Weyl points are not clearly observed probably due to roughness of the fractured surface.
我们通过角度分辨光发射光谱（ARPES）和能带结构计算研究了手性 IrGe4 的能带结构。能带结构计算预测了时间反转不变量动量点的克拉默-韦勒退性。虽然 IrGe4 没有明确的裂解面，但我们可以通过 ARPES 观察到与动量相关的 ARPES 强度调制。在计算和实验中，费米水平附近的 ARPES 强度在 M 点和 K 点附近都有所增强，而 Ge 4p 带位于费米水平以下约 0.3 eV 处。虽然 Ge 4p 和 Ir 5d 带的整体带色散与计算结果一致，但可能由于断裂表面的粗糙度，在 Kramers-Weyl 点之间的表面态并没有被清楚地观察到。
{"title":"Electronic Properties of Chiral IrGe4 Studied by Angle Resolved Photoemission Spectroscopy and Band Structure Calculation","authors":"Genki Hayashi, Taiki Shimaiwa, Mario Okawa, Naoki Nakamura, Ryuji Higashinaka, Tatsuma D. Matsuda, Yuji Aoki, Miho Kitamura, Daisuke Shiga, Hiroshi Kumigashira, Marek Kopciuszynski, Alexey Barinov, Naurang. L. Saini, Takashi Mizokawa","doi":"10.7566/jpsj.93.014702","DOIUrl":"https://doi.org/10.7566/jpsj.93.014702","url":null,"abstract":"We have investigated band structure of chiral IrGe<sub>4</sub> by means of angle-resolved photoemission spectroscopy (ARPES) and band structure calculation. The band structure calculation predicts Kramers–Weyl degeneracy at the time reversal invariant momentum points. Although IrGe<sub>4</sub> does not have a well-defined cleavage plane, we could observe momentum-dependent ARPES intensity modulations by ARPES. The ARPES intensity near the Fermi level was enhanced around the M and K points where the Ge 4<i>p</i> bands are located at about 0.3 eV below the Fermi level both in the calculation and in the experiment. Although the overall band dispersion of the Ge 4<i>p</i> and Ir 5<i>d</i> bands agrees with the calculation, surface states between the Kramers–Weyl points are not clearly observed probably due to roughness of the fractured surface.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"49 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138575108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study investigated the magnetic field (H) dependence of thermal conductivity (κ) in type I (Pb) and type II (Nb) superconductors. The κ of Nb displayed hysteresis, showing a local minimum during increasing H process but not during decreasing H process. Different magnetic field dependencies were observed in Pb with varying purity: κ of 3N-Pb exhibited broad hysteresis, while that of 5N-Pb showed hysteresis similar to 3N-Nb.
本研究调查了 I 型（铅）和 II 型（铌）超导体中热导率（κ）与磁场（H）的关系。Nb 的 κ 显示出滞后性，在 H 值增加过程中出现局部最小值，而在 H 值减小过程中则没有。在纯度不同的铌中观察到了不同的磁场依赖性：3N-铌的κ表现出宽滞后，而 5N-Pb 的κ表现出与 3N-Nb 相似的滞后。
{"title":"Magnetic Field Hysteresis of Thermal Conductivity in Type-I and Type-II Superconductors","authors":"Hiroto Arima, Miku Yoshida, Yoshikazu Mizuguchi","doi":"10.7566/jpsj.93.015001","DOIUrl":"https://doi.org/10.7566/jpsj.93.015001","url":null,"abstract":"This study investigated the magnetic field (<i>H</i>) dependence of thermal conductivity (<i>κ</i>) in type I (Pb) and type II (Nb) superconductors. The <i>κ</i> of Nb displayed hysteresis, showing a local minimum during increasing <i>H</i> process but not during decreasing <i>H</i> process. Different magnetic field dependencies were observed in Pb with varying purity: <i>κ</i> of 3N-Pb exhibited broad hysteresis, while that of 5N-Pb showed hysteresis similar to 3N-Nb.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"67 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138554415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shin-ichi Kimura, Hiroshi Watanabe, Shingo Tatsukawa, Takuto Nakamura, Keiichiro Imura, Hiroyuki S. Suzuki, Noriaki K. Sato
A strongly correlated insulator, samarium mono-sulfide (SmS), presents not only the pressure-induced insulator-to-metal transition (IMT) with the color change from black to golden-yellow but also current-induced IMT (CIMT) with negative resistance. To clarify the origin of the CIMT of SmS, the electronic structure change has been investigated by optical reflectivity and angle-integrated photoelectron spectra by applying an electric current. At lower temperatures than about 100 K, where the nonlinear V–I curve has been observed, the carrier density rapidly increases, accompanied by decreasing relaxation time of carriers with increasing current. Then, the direct gap size increases, and the mean valence changes from Sm2+-dominant SmS to the mixed-valent one with increasing current. These results suggest that the CIMT originates from increasing the Sm 4f-5d hybridization intensity induced by the applied current.
单硫化钐（SmS）是一种强相关绝缘体，它不仅具有从黑色变为金黄色的压力诱导绝缘体向金属转变（IMT）现象，而且还具有负电阻的电流诱导绝缘体向金属转变（CIMT）现象。为了弄清 SmS 的 CIMT 的起源，我们通过施加电流的光学反射率和角度积分光电子能谱研究了电子结构的变化。在低于约 100 K 的温度下，即观察到非线性 V-I 曲线的温度下，载流子密度迅速增加，同时载流子的弛豫时间随着电流的增加而减少。然后，直接间隙增大，平均价态随着电流的增加从 Sm2+ 主导型 SmS 转变为混合价态。这些结果表明，CIMT 源于外加电流引起的 Sm 4f-5d 杂化强度的增加。
{"title":"Current-Induced Metallization and Valence Transition in Black SmS","authors":"Shin-ichi Kimura, Hiroshi Watanabe, Shingo Tatsukawa, Takuto Nakamura, Keiichiro Imura, Hiroyuki S. Suzuki, Noriaki K. Sato","doi":"10.7566/jpsj.93.013701","DOIUrl":"https://doi.org/10.7566/jpsj.93.013701","url":null,"abstract":"A strongly correlated insulator, samarium mono-sulfide (SmS), presents not only the pressure-induced insulator-to-metal transition (IMT) with the color change from black to golden-yellow but also current-induced IMT (CIMT) with negative resistance. To clarify the origin of the CIMT of SmS, the electronic structure change has been investigated by optical reflectivity and angle-integrated photoelectron spectra by applying an electric current. At lower temperatures than about 100 K, where the nonlinear <i>V</i>–<i>I</i> curve has been observed, the carrier density rapidly increases, accompanied by decreasing relaxation time of carriers with increasing current. Then, the direct gap size increases, and the mean valence changes from Sm<sup>2+</sup>-dominant SmS to the mixed-valent one with increasing current. These results suggest that the CIMT originates from increasing the Sm 4<i>f</i>-5<i>d</i> hybridization intensity induced by the applied current.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"17 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138547796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, we investigated the spectral functions of quasi-one-dimensional electronic systems realized in metallic fullerene polymers theoretically. We applied the multichannel bosonization method to the electronic band structures derived from two different atomic models of fullerene polymers. Both the obtained analytical formulation and numerical calculations revealed significant differences between the two models in the energy dependence of the spectral functions, despite the slight difference in their atomic arrangement. These results indicate that the precise atomic arrangement of synthesized fullerene polymers can be determined using spectral function data obtained by angle-resolved photoemission spectroscopy.
{"title":"Spectral Functions of Metallic Fullerene Polymers: A Theoretical Tool for Atomic Structures Identification","authors":"Mayu Nishimoto, Hideo Yoshioka, Hiroyuki Shima","doi":"10.7566/jpsj.93.014701","DOIUrl":"https://doi.org/10.7566/jpsj.93.014701","url":null,"abstract":"In this study, we investigated the spectral functions of quasi-one-dimensional electronic systems realized in metallic fullerene polymers theoretically. We applied the multichannel bosonization method to the electronic band structures derived from two different atomic models of fullerene polymers. Both the obtained analytical formulation and numerical calculations revealed significant differences between the two models in the energy dependence of the spectral functions, despite the slight difference in their atomic arrangement. These results indicate that the precise atomic arrangement of synthesized fullerene polymers can be determined using spectral function data obtained by angle-resolved photoemission spectroscopy.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"30 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138513472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01Epub Date: 2023-05-10DOI: 10.1007/s12070-023-03873-4
Jeyasakthy Saniasiaya
Vestibular dysfunction in children and adolescents has recently gained tremendous attention, with more child-friendly investigations and rehabilitation protocols emerging.Reports have shown that children with vestibular impairment tend to develop speech and language acquisition delay, fine and gross motor delay, which in the long-termresults in an overall poor quality of life. In an extreme situation, vestibular dysfunction can lead to dissociative syndromes such as depersonalisation/derealisation symptomsthat occur following a mismatch between the vestibular signals and other sensory inputs, which may, in turn, lead to suicidal thoughts and behaviour 1. Whilst measuresto incorporate vestibular assessment as a part of routine practice in paediatric patients have been carried out in most centres, pediatric vestibular medicine appears to beunfathomed in some parts of the world, notably the South-East Asian region.
{"title":"Could Cultural and Background Resilience be the Main Culprit for Neglected Vestibular Dysfunction in Children?","authors":"Jeyasakthy Saniasiaya","doi":"10.1007/s12070-023-03873-4","DOIUrl":"10.1007/s12070-023-03873-4","url":null,"abstract":"<p><p>Vestibular dysfunction in children and adolescents has recently gained tremendous attention, with more child-friendly investigations and rehabilitation protocols emerging.Reports have shown that children with vestibular impairment tend to develop speech and language acquisition delay, fine and gross motor delay, which in the long-termresults in an overall poor quality of life. In an extreme situation, vestibular dysfunction can lead to dissociative syndromes such as depersonalisation/derealisation symptomsthat occur following a mismatch between the vestibular signals and other sensory inputs, which may, in turn, lead to suicidal thoughts and behaviour 1. Whilst measuresto incorporate vestibular assessment as a part of routine practice in paediatric patients have been carried out in most centres, pediatric vestibular medicine appears to beunfathomed in some parts of the world, notably the South-East Asian region.</p>","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"87 1","pages":"4114-4115"},"PeriodicalIF":0.6,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10645674/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88509293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Momentum-dependent local ansatz (MLA) wavefunction approach to correlated electrons in solids has been extended to the quasiparticle excited states on the basis of the Fermi liquid picture. The quasiparticle energy is derived from the MLA-base excited state wavefunction within the single-site approximation. The quasiparticle weight and quasiparticle energy have been calculated for the Hubbard model on the hypercubic lattice in infinite dimensions as well as the simple cubic lattice. By comparing the numerical results with the single-particle excitation spectra obtained by the Green function method, it is shown that the MLA excited wavefunctions describe well the quasiparticle states in the weak and intermediate Coulomb interaction regime in the high dimensional system.
{"title":"Momentum-Dependent Local Ansatz Approach to the Quasiparticle States","authors":"Yoshiro Kakehashi","doi":"10.7566/jpsj.92.114704","DOIUrl":"https://doi.org/10.7566/jpsj.92.114704","url":null,"abstract":"Momentum-dependent local ansatz (MLA) wavefunction approach to correlated electrons in solids has been extended to the quasiparticle excited states on the basis of the Fermi liquid picture. The quasiparticle energy is derived from the MLA-base excited state wavefunction within the single-site approximation. The quasiparticle weight and quasiparticle energy have been calculated for the Hubbard model on the hypercubic lattice in infinite dimensions as well as the simple cubic lattice. By comparing the numerical results with the single-particle excitation spectra obtained by the Green function method, it is shown that the MLA excited wavefunctions describe well the quasiparticle states in the weak and intermediate Coulomb interaction regime in the high dimensional system.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"2 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136227094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Origins of Valley Current Reversal in Partially Overlapped Graphene Layers","authors":"Ryo Tamura","doi":"10.7566/jpsj.92.114706","DOIUrl":"https://doi.org/10.7566/jpsj.92.114706","url":null,"abstract":"","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"11 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136228571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design and Observation of Topological Band Gaps and Edge Modes of SOI Photonic Crystal Slabs in the Mid-Infrared Range","authors":"Afshan Begum, Yuanzhao Yao, Takashi Kuroda, Yoshihiko Takeda, Naoki Ikeda, Yoshimasa Sugimoto, Takaaki Mano, Kazuaki Sakoda","doi":"10.7566/jpsj.92.114402","DOIUrl":"https://doi.org/10.7566/jpsj.92.114402","url":null,"abstract":"","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"15 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136227117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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