2007 Fiscal Year Final Research Report Summary
Theory of superconducting/superfluid vortices with time-reversal symmetry
| 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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| Keywords | superconductivity / superfluidity / quantum vortex / impurity effect / Andreev bound state / local density of states / quantum effect / anisotropic superconductor |
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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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Research Products
(65 results)
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[Book] 物性物理学演習2006
Author(s)
前田京剛 加藤雄介
Total Pages
473
Publisher
吉岡書店
Description
「研究成果報告書概要(和文)」より
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