キタエフ模型に基づく新奇デバイスの理論的提案

基于 Kitaev 模型的新型装置的理论建议

• 批准号: 21H01025
• 负责人: 土浦 宏紀
• 金额: $ 9.73万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21H01025/
• 关键词: キタエフ模型; マヨラナ準粒子; 超伝導量子計算素子; 並進・回転対称性の破れたスピン3重項超伝導状態; ジョセフソン効果; トポロジカル超伝導; トポロジカル論理ゲート

キタエフ模型には量子スピン型と1次元p波超伝導型の2種類が知られており，どちらもマヨラナ準粒子を伴う．本申請課題においては，これら二つのキタエフ模型を基にした，braidingを伴わない量子計算素子や，マヨラナ準粒子によるスピンまたは量子位相伝播を利用した論理ゲート等の理論的提案を行い，その特性やノイズ耐性の評価および，第一原理計算を援用した材料探索までを包含した，キタエフ模型の実用化に関する新たなアプローチを展開する．まず1次元p波キタエフ模型に関しては，この模型を平行に配置したワイヤー対を一つのユニットとみなし，さらにこのユニット間のジョセフソン接合素子を調べてきた．初年度の研究により，ユニット間の結合強度およびワイヤー対間の位相差を制御することにより，トポロジカルジョセフソン特性をはじめ，通常の0接合と呼ばれる特性，さらにはπ接合と呼ばれる特性が得られることを見出した．このようにジョセフソン効果の位相-電流特性を外的に制御できる系は，超伝導量子計算メモリ等への応用が期待される. また，2年目の研究により，こうした多様なジョセフソン電流特性が現れる機構を，マヨラナ準粒子の描像に基づく解析により明らかにすることができた．続いて，量子スピン型キタエフ模型に関しては，遍歴マヨラナ粒子による磁気励起伝播の応用可能性について調べてきた．キタエフ模型における磁気励起を運ぶのは電気的に中性の遍歴マヨラナ粒子である．初年度の研究により，キタエフ模型に外部磁場を印加してマヨラナ粒子にエネルギーギャップを与えることにより，磁気励起伝播のON/OFFが可能であることを見出した．また，2年目の研究により，キャリアをドープした量子スピン型キタエフ模型において，回転対称性の破れたスピン3重項の超伝導状態が発現しうることを見出した．

In this application, we will learn about the quantum model, the 1-dimensional p-wave super model, the 1-dimensional p-wave super-model, the 1-dimensional p-wave supermodel, the 1-dimensional p-wave super-model, the 1-dimensional p-wave supermodel, the 1-dimensional p-wave super-model, the 1-dimensional p-wave supermodel, the 1-dimensional p-wave super-model, the 1-dimensional p-wave super-fast model, the 1-dimensional p-wave supermodel, the 1-dimensional p-wave superharmonic model, the 1-dimensional p-wave supermodel, the 1- In this paper, we use the proposed theory of quantum phase broadcasting, which is based on the theoretical proposals of the theory, such as the theory of quantum phase. The first principle calculation is based on the analysis of the properties and the tolerance of the theoretical theory. the first-principle calculation is based on the introduction of the material exploration model, which contains the data in the first-principle calculation. The model is parallel to the configuration of the device, and the model is in parallel with each other. The model is configured in parallel with the model, and the model is configured in parallel with the model. The model is configured in parallel with the model, and the model is configured in parallel. This is the first year of the study, which combines the strength of the phase difference between the temperature and the phase difference between the two. Usually, when 0 is used to connect the characteristic of the circuit, the characteristic of the device can be obtained. The system outside the phase-current characteristic is used to control the system, and the superconducting quantum computing system is used to expect the characteristic. In the past two years, we have studied the characteristics of electric current in order to improve the characteristics of electric current. in this paper, we have studied the characteristics of electric current in the system for two years, and the characteristics of electric current have been studied in this paper. All over the world, there is a possibility that the broadcast may be used. The model is designed to excite the neutrals of electrical power generation electrons. in the first year of the study, the model was printed in the external magnetic field and the particles were printed in the external magnetic field. It is possible that the magnetic field can be used to broadcast the ON/OFF. After two years of research, the performance of the model is improved, and the symmetry of the model is analyzed.

项目成果

Danube University, Krems(オーストリア)

克雷姆斯多瑙河大学（奥地利）

Rare-earth moment reduction and local magnetic anisotropy in Pr2Fe14B and Tm2Fe14B

Pr2Fe14B 和 Tm2Fe14B 中稀土磁矩的降低和局部磁各向异性

• DOI: 10.1016/j.jmmm.2021.168684
• 发表时间: 2022
• 期刊: Journal of Magnetism and Magnetic Materials
• 影响因子: 2.7
• 作者: Sato Hiroto;Yoshioka Takuya;Tsuchiura Hiroki;Mizuno Yoshiyuki;Koike Kunihiro;Takahashi Kohki;Kato Hiroaki
• 通讯作者: Kato Hiroaki

Maximum energy product of exchange-coupled Sm(FeCo)12/α-Fe nanocomposite particle

• DOI: 10.1063/9.0000506
• 发表时间: 2023-02-01
• 期刊: AIP ADVANCES
• 影响因子: 1.6
• 作者: Uda，Ryusei;Koike，Kunihiro;Tsuchiura，Hiroki
• 通讯作者: Tsuchiura，Hiroki

Spin current rectifier based on the Kitaev spin model

基于Kitaev自旋模型的自旋电流整流器

• 发表时间: 2022
• 作者: O. Kanehira;H. Tsuchiura;and A. Koga
• 通讯作者: and A. Koga

Josephson current-phase relations between paired parallel one-dimensional p-wave superconducting wires

成对平行一维p波超导线之间的约瑟夫森电流-相位关系

• 发表时间: 2022
• 作者: C.-R. Xie;S. Fukuda;H. Tsuchiura;and Y. Tanaka
• 通讯作者: and Y. Tanaka