Multilevel Effect on the Josephson Current through a Quantum Dot
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概要
- 論文の詳細を見る
Josephson ctrrrent throtngh a tntrltilevel qtranttrtta dot with strong Coulomb repulsion is sttrdiedby rneans of a Hartree-Fock ;tpproxirnation. We pay attention to the offdiagonal Cooper pairtunneling process in whicla an tup-spin electron and a down-sjcin electron are transf'erred tothe opposite bank throtrgh difUex'ent single-jcarticle levels in the dot. It is shown that, if' theoffdiagonal tunneling process is relevant, tlae systeun can behave 218 a rc junction even when thedot is nonrnagnetic xvithotrt a localized spin. It is also ['ound that m-.junction behavior is enhancedwith increasing the nuttaber of the dot levels. On the other h?tnd, if the ofl'diagonal ttnnnelir'?gprocess is coraapletely negligible, tire zmtrltilevel structtzre stmppresses m-junction behavior. Tlaeserestrlts itadicate that we shotrld take the untmltilevel ef['ects into accotrnt in an?tlyzing the Josephsoncttrrent throttgh a correlated qtrantuna dot.
- 社団法人日本物理学会の論文
- 1998-05-15
著者
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Isawa Yoshimasa
Department Of Physical Electronics Faculty Of Engineering Hiroshima University
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Takane Yositake
Department Of Applied Physics Osaka City University
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SHIMIZU Yoshiteru
Department of Applied Physics,Osaka City University
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HORII Hideto
Department of Physics Electronic,Hirochima University
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Horii Hideto
Department Of Applied Physics Osaka City University
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Shimizu Yoshiteru
Department Of Applied Physics Osaka City University
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TAKANE Yositake
Department of Applied Physics,Osaka City University
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ISAWA Yoshimasa
Department of Physics Electronic,Hiroshima University
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