多成分超伝導体の新奇な磁束量子状態と相図

2012 年度 研究成果報告書

• 研究課題/領域番号: 22540377
• 研究種目: 基盤研究(C)
• 配分区分: 補助金
• 応募区分: 一般
• 研究分野: 物性Ⅱ
• 研究機関: 独立行政法人物質・材料研究機構
• 研究代表者: 胡 暁 独立行政法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 主任研究者 (90238428)
• 研究期間 (年度): 2010 – 2012
• キーワード: 超伝導・密度波 / 鉄系とMgB2等の多成分超伝導 / 量子渦糸 / GL理論

研究概要

三つ以上の成分を持つ超伝導体で、成分間に斥力が働く場合超伝導秩序変数の間にゼロと 以外の非自明な位相差が現れ、時間反転対称性が破れる。この状態では、臨界点近傍で発散する超伝導コヒーレンス長が二つ以上現れ、ギンツブルグ・ランダウ(GL)パラメータによる超伝導の分類が不十分である。このため、新奇な量子渦糸状態が可能になる。また、成分間の超伝導位相差の振動(Leggettモード)エネルギーが小さく、安定に存在する。

研究成果

• [雑誌論文] Unconventional Vortex State in Multicomponent Superconductors with Time-Reversal Symmetry Breaking (2013)
  • 著者名/発表者名: Y. Takahashi, Z. Huang, X. Hu
  • 雑誌名: Physica C
  • 査読あり
• [雑誌論文] Cavity phenomenon and terahertz radiation of a tall stack of intrinsic Josephson junctions wrapped by a dielectric material (2012)
  • 著者名/発表者名: F. Liu, S. ?Z. Lin and X. Hu
  • 雑誌名: Supercond. Sci. Technol 巻: vol. 26
  • 査読あり
• [雑誌論文] Chiral Majorana fermion edge states in a heterostructure of superconductor and semiconductor with spin-orbit coupling (2012)
  • 著者名/発表者名: L. ?H. Wu, Q. ?F. Liang, Z. Wang and X. Hu
  • 雑誌名: J. Phys. Conf. Series 巻: vol. 393
  • 査読あり
• [雑誌論文] Massless Leggett Mode in Multi-band Superconductors with Time-Reversal-Symmetry Breaking (2012)
  • 著者名/発表者名: S. ?Z. Lin and X. Hu
  • 雑誌名: Phys. Rev. Lett. 巻: vol. 108
  • 査読あり
• [雑誌論文] Half Metallic Antiferromagnet as a Prospective Material for Spintronics (2012)
  • 著者名/発表者名: X. Hu
  • 雑誌名: Adv. Mater 巻: vol. 24 ページ: 294
  • 査読あり
• [雑誌論文] Stability and Josephson Effect of Time-Reversal Symmetry Broken Multi-Component Superconductivity induced by Frustrated Inter-Component Couplings (2012)
  • 著者名/発表者名: X. Hu and Z. Wang
  • 雑誌名: Phys. Rev B 巻: vol. 85
  • 査読あり
• [雑誌論文] Scaling Behaviors and Novel Creep Motions of Flux Lines under AC Driving with Point-like Pins (2012)
  • 著者名/発表者名: W.-P. Cao, M.-B. Luo and X. Hu
  • 雑誌名: New J. Phys. 巻: vol.14
  • 査読あり
• [雑誌論文] Manipulation of Majorana fermions by point-like gate voltage in the vortex state of a topological superconductor (2012)
  • 著者名/発表者名: Q.-F. Liang, Z. Wang, and X. Hu
  • 雑誌名: Europhys. Lett. 巻: 99
  • 査読あり
• [雑誌論文] In-plane dissipation as a possible synchronization mechanism for terahertz radiation from intrinsic Josephson junctions of layered superconductors (2012)
  • 著者名/発表者名: S. ?Z. Lin and X. Hu
  • 雑誌名: Phys. Rev. B 巻: vol. 86
  • 査読あり
• [雑誌論文] Phase solitons in multi-band superconductors with and without time-reversal symmetry (2012)
  • 著者名/発表者名: S. -Z. Lin and X. Hu
  • 雑誌名: New J. Phys. 巻: vol. 14
  • 査読あり
• [雑誌論文] Bulaevskii: "Synchronization in a one-dimensional array of point Josephson junctions coupled to a common load (2011)
  • 著者名/発表者名: S.-Z. Lin, X. Hu and L.
  • 雑誌名: Phys. Rev. B 巻: vol. 84
  • 査読あり
• [雑誌論文] Interference and Switching of Josephson Current Carried by Nonlocal Spin-Entangled Electrons in a SQUID-like System with Quantum Dots (2011)
  • 著者名/発表者名: Z. Wang and X. Hu
  • 雑誌名: Phys. Rev. Lett. 巻: Vol. 106
  • 査読あり
• [雑誌論文] Radiation of Terahertz Electromagnetic Waves from Build-in Nano Josephson Junctions of Cuprate High-Tc Superconductors (2011)
  • 著者名/発表者名: S.-Z. Lin and X. Hu
  • 雑誌名: J. Nanosci. Nanotechno 巻: vol. 11
  • 査読あり
• [雑誌論文] Vortex States and Phase Diagram of Multi-component Superconductors with Competing Repulsive and Attractive Vortex Interactions (2011)
  • 著者名/発表者名: S.-Z. Lin and X. Hu
  • 雑誌名: Phys. Rev. B 巻: vol. 84
  • 査読あり
• [雑誌論文] Impurity induced states on the superconducting interface LaAlO3/ SrTiO3 (2010)
  • 著者名/発表者名: B. Liu and X. Hu
  • 雑誌名: Phys. Rev. B 巻: vol.81
  • 査読あり
• [雑誌論文] Half-Metallic Antiferromagnet BaCrFeAs2 (2010)
  • 著者名/発表者名: S.-J. Hu and X. Hu
  • 雑誌名: J. Phys. Chem. C 巻: vol. 114
  • 査読あり
• [雑誌論文] Phase dynamics in a stack of inductively coupled intrinsic Josephson junctions and terahertz electromagnetic radiation (2010)
  • 著者名/発表者名: X. Hu and S.-Z. Lin
  • 雑誌名: Supercond. Sci. Technol. 巻: Vol.23
  • 査読あり
• [雑誌論文] Response and amplification of terahertz electromagnetic waves in intrinsic Josephson junctions of layered high-Tc superconductor (2010)
  • 著者名/発表者名: S.-Z. Lin and X. Hu
  • 雑誌名: Phys. Rev. B 巻: vol 82
  • 査読あり
• [雑誌論文] Dynamics of Bragg glass in high-Tc superconductors near depinning transition (2010)
  • 著者名/発表者名: M.-B. Luo and X. Hu
  • 雑誌名: Physica C 巻: 470
  • 査読あり
• [雑誌論文] Local electronic structures in electron-doped cuprates with coexisting orders (2010)
  • 著者名/発表者名: B. Liu and X. Hu
  • 雑誌名: Physica C 巻: 470
  • 査読あり
• [雑誌論文] Stability of the kink state in a stack of intrinsic Josephson junctions (2010)
  • 著者名/発表者名: S.-Z. Lin and X. Hu
  • 雑誌名: Physica C 巻: 470
  • 査読あり
• [学会発表] Topological Nanoarchitectonics (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: 10th Intensive-Interactive Meeting 'Topological Superconductivity/Superfluidity
  • 発表場所: Osaka University, Osaka, Japan
  • 年月日: 20121213-14
• [学会発表] Manipulation of Majorana Fermions in Topological Superconductor (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: The 2012 Hong Kong Forum of Physics: Novel Quantum Phenomena (HKFP-2011)
  • 発表場所: University of Hong Kong, Hong Kong
  • 年月日: 20121212-13
• [学会発表] Time-Reversal-Symmetry Broken Superconductivity in Multi-Band Superconductors (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: Ninth International Conference on New Theories, Discoveries, and Applications of Superconductors and Related Materials (New3SC-9)
  • 発表場所: Rome, Italy
  • 年月日: 20120916-20
• [学会発表] Majorana Fermion in Topological Superconductor (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: The 11th International Conference on Condensed Matter Theory and Computational Materials Science
  • 発表場所: Shandong University, Jinan, China
  • 年月日: 20120812-15
• [学会発表] Majorana States in Spin-Orbit Coupling Topological Superconductor and their Novel Applications (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: Worldwide Universities Network 4th International Conference on Spintronics
  • 発表場所: University of Sydney, Australia
  • 年月日: 20120723-25
• [学会発表] Majorana fermions in heterostructure of spin-orbit coupled semiconductor and s-wave superconductor (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: Dubna NANO-2012
  • 発表場所: Dubna, Russia
  • 年月日: 20120709-14
• [学会発表] Theory for Josephson Plasma and THz Radiation of Intrinsic Josephson Junctions (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: The 8th International Symposium on Intrinsic Josephson Effects and Plasma Oscillations in High-Tc Superconductors (PLASMA 2012)
  • 発表場所: Izmir, Turkey
  • 年月日: 20120610-13
• [学会発表] Non-Abelian Majorana Fermions in Vortex State of Topological Superconductor (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: at "East Asia Joint Seminars on Statistical Physics 2012
  • 発表場所: Suzhou, China
  • 年月日: 20120318-20
• [学会発表] Majorana Fermions in Vortex State of Topological Superconductor (2012)
  • 著者名/発表者名: X. Hu
  • 学会等名: the International Workshop on Path-breaking Phase Science in Superconductivity
  • 発表場所: Osaka
  • 年月日: 20120113-15
• [学会発表] Nonlocal Quantum Entanglement in Electron Systems (2011)
  • 著者名/発表者名: X. Hu
  • 学会等名: The 2011 Hong Kong Forum of Physics: Novel Quantum Phenomena (HKFP-2011)
  • 発表場所: University of Hong Kong, Hong Kong
  • 年月日: 20111214-16
• [学会発表] Exploring Novel Functional Materials for Spintronics based on First Principles Calculations (2011)
  • 著者名/発表者名: X. Hu
  • 学会等名: at the International Conference on Advanced Materials and Nanotechnology
  • 発表場所: Kathmandu, Nepal
  • 年月日: 20111021-23
• [学会発表] Phase Dynamics in Intrinsic Josephson Junctions of Cuprate High-Tc Superconductors and THz Radiation (2011)
  • 著者名/発表者名: X. Hu
  • 学会等名: the 2nd JST-DFG Workshop on Terahertz Superconductor Electronics
  • 発表場所: Blauberen, Germany
  • 年月日: 20111016-19
• [学会発表] Phase Dynamics in Intrinsic Josephson Junctions and THz Radiation (2011)
  • 著者名/発表者名: X. Hu
  • 学会等名: the 13th International Workshop on Vortex Matter in Superconductors
  • 発表場所: Chicago, China
  • 年月日: 20110801-05
• [学会発表] Nonlocal Quantum Entanglement of Electron Pairs in a SQUID-like Structure (2011)
  • 著者名/発表者名: X. Hu
  • 学会等名: The 10th International Conference on Condensed Matter Theory and Computational Materials Science
  • 発表場所: Jinhua, China
  • 年月日: 20110713-17
• [学会発表] Multi-Component Superconductor with Frustrated Couplings (2011)
  • 著者名/発表者名: X. Hu
  • 学会等名: the First International Workshop on Superconducting Vortex Matter
  • 発表場所: Jinhua, China
  • 年月日: 20110527-31
• [学会発表] Theoretical design of half-metallic antiferromagnet based on perovskite cuprate (2010)
  • 著者名/発表者名: X. Hu
  • 学会等名: Pacifichem 2010
  • 発表場所: Hawaii, USA
  • 年月日: 20101215-20
• [学会発表] Theory on THz radiation of intrinsic Josephson junctions of cuprate superconductors (2010)
  • 著者名/発表者名: X. Hu
  • 学会等名: The 6th International Conference on Science and Engineering of Novel Superconductors
  • 発表場所: Montecatini Terme, Tuscany, Italy
  • 年月日: 20100613-18
• [備考]
  • URL: http://www.nims.go.jp/mana/lab/theorphys/