| Project/Area Number |
17540314
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KATO Yusuke The University of Tokyo, Graduate School of Arts and Science, Associate Professor (20261547)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Yusuke the University of Tokyo, Graduate School of Arts and Science, Associate Professor (20261547)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | superconductivity / superfluidity / quantum vortex / impurity effect / Andreev bound state / local density of states / quantum effect / anisotropic superconductor / 渦糸 / 電子状態 / 準古典理論 / 走査型トンネル分光 / アイレンバーガー方程式 / 準古典近似 / STM / 分数渦 / ピン止め |
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| Research Abstract |
We have investigated impurity effects on superconducting vortex core by self-consistent calculation of gap equation and Dyson equation for impurity self-energy. Our finding is that the impurities are harmless to localized bound states of quasi-particles around chiral p-wave vortex cores. Our result suggests that the chiral p-wave superconducting vortices provide a chance to see the vortex shrinking effect (so-called Kramer-Pesch effect)/ Chiral p-wave vortices can be realized in mixed state of Sr2RuO4. Vortex shrinking effects can be observed by measurement the distribution of circular current distribution through muon-spin relaxation measurements.
As a related topic, we have considered the scattering problem by potential wall in the superfluid bose system (so-called "anomalous tunneling" in bose systems). As a result, we have found that quasi-particles transmit potential barrier without reflection at low energy limit for arbitrary shape of potential barrier. Analogous phenomena have been found in spatially isotropic s-wave superconducting/superfluid Fermi systems and in vortex cores of chiral p-wave superconductors. Thus, we conclude that the absence of impurity effects are common features in superconducting/superfluid systems with isotropy.
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