Abstract
Chiral order of the Josephson-junction ladder with half a flux quantum per plaquette is studied by means of the exact diagonalization method. We consider an extreme quantum limit where each superconductor grain (order parameter) is represented by S = 1/2 spin. So far, the semi-classical S → ∞ case, where each spin reduces to a plane rotator, has been considered extensively. We found that in the case of S = 1/2, owing to the strong quantum fluctuations, the chiral (vortex lattice) order becomes dissolved except in a region, where attractive intrachain and, to our surprise, repulsive interchain interactions both exist. On the contrary, for considerably wide range of parameters, the superconductor (XY) order is kept critical. The present results are regarded as a demonstration of the critical phase accompanying chiral-symmetry breaking predicted for frustrated XXZ chain field-theoretically.
| Original language | English |
|---|---|
| Pages (from-to) | 295-299 |
| Number of pages | 5 |
| Journal | European Physical Journal B |
| Volume | 17 |
| Issue number | 2 |
| Publication status | Published - Sep 2 2000 |
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Keywords
- 75.10.Jm Quantized spin models
- 75.40.Mg Numerical simulation studies
- 85.25.Cp Josephson devices
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Finite-size-scaling analyses of the chiral order in the Josephson-junction ladder with half a flux quantum per plaquette. / Nishiyama, Yoshihiro.
In: European Physical Journal B, Vol. 17, No. 2, 02.09.2000, p. 295-299.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Finite-size-scaling analyses of the chiral order in the Josephson-junction ladder with half a flux quantum per plaquette
AU - Nishiyama, Yoshihiro
PY - 2000/9/2
Y1 - 2000/9/2
N2 - Chiral order of the Josephson-junction ladder with half a flux quantum per plaquette is studied by means of the exact diagonalization method. We consider an extreme quantum limit where each superconductor grain (order parameter) is represented by S = 1/2 spin. So far, the semi-classical S → ∞ case, where each spin reduces to a plane rotator, has been considered extensively. We found that in the case of S = 1/2, owing to the strong quantum fluctuations, the chiral (vortex lattice) order becomes dissolved except in a region, where attractive intrachain and, to our surprise, repulsive interchain interactions both exist. On the contrary, for considerably wide range of parameters, the superconductor (XY) order is kept critical. The present results are regarded as a demonstration of the critical phase accompanying chiral-symmetry breaking predicted for frustrated XXZ chain field-theoretically.
AB - Chiral order of the Josephson-junction ladder with half a flux quantum per plaquette is studied by means of the exact diagonalization method. We consider an extreme quantum limit where each superconductor grain (order parameter) is represented by S = 1/2 spin. So far, the semi-classical S → ∞ case, where each spin reduces to a plane rotator, has been considered extensively. We found that in the case of S = 1/2, owing to the strong quantum fluctuations, the chiral (vortex lattice) order becomes dissolved except in a region, where attractive intrachain and, to our surprise, repulsive interchain interactions both exist. On the contrary, for considerably wide range of parameters, the superconductor (XY) order is kept critical. The present results are regarded as a demonstration of the critical phase accompanying chiral-symmetry breaking predicted for frustrated XXZ chain field-theoretically.
KW - 75.10.Jm Quantized spin models
KW - 75.40.Mg Numerical simulation studies
KW - 85.25.Cp Josephson devices
UR - http://www.scopus.com/inward/record.url?scp=0001247221&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0001247221&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0001247221
VL - 17
SP - 295
EP - 299
JO - European Physical Journal B
JF - European Physical Journal B
SN - 1434-6028
IS - 2
ER -