Abstract
A spontaneous surface current state is investigated in unconventional superconductivity with broken time-reversal-symmetry. It is shown that a BCS supercurrent lowers the energy of the system in this state. The lowest state has zero total current; it satisfies the Bloch theorem which states absence of the total current in any stable state with no external field. We also show that the magnitude and the direction of the spontaneous current are strongly affected by the detail of the Fermi surface. We explain this effect in connection with a low-energy bound state near the surface originating from the anisotropy of the order parameter.
| Original language | English |
|---|---|
| Pages (from-to) | 987-993 |
| Number of pages | 7 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 68 |
| Issue number | 3 |
| Publication status | Published - 1999 Mar |
| Externally published | Yes |
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Keywords
- BCS supercurrent
- Bloch theorem
- d-wave superconductivity
- Spontaneous surface current
- Time-reversal symmetry breaking
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Effect of the BCS supercurrent on the spontaneous surface flow in unconventional superconductivity with broken time-reversal-symmetry. / Kusama, Yoshikatsu; Ohashi, Yoji.
In: Journal of the Physical Society of Japan, Vol. 68, No. 3, 03.1999, p. 987-993.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of the BCS supercurrent on the spontaneous surface flow in unconventional superconductivity with broken time-reversal-symmetry
AU - Kusama, Yoshikatsu
AU - Ohashi, Yoji
PY - 1999/3
Y1 - 1999/3
N2 - A spontaneous surface current state is investigated in unconventional superconductivity with broken time-reversal-symmetry. It is shown that a BCS supercurrent lowers the energy of the system in this state. The lowest state has zero total current; it satisfies the Bloch theorem which states absence of the total current in any stable state with no external field. We also show that the magnitude and the direction of the spontaneous current are strongly affected by the detail of the Fermi surface. We explain this effect in connection with a low-energy bound state near the surface originating from the anisotropy of the order parameter.
AB - A spontaneous surface current state is investigated in unconventional superconductivity with broken time-reversal-symmetry. It is shown that a BCS supercurrent lowers the energy of the system in this state. The lowest state has zero total current; it satisfies the Bloch theorem which states absence of the total current in any stable state with no external field. We also show that the magnitude and the direction of the spontaneous current are strongly affected by the detail of the Fermi surface. We explain this effect in connection with a low-energy bound state near the surface originating from the anisotropy of the order parameter.
KW - BCS supercurrent
KW - Bloch theorem
KW - d-wave superconductivity
KW - Spontaneous surface current
KW - Time-reversal symmetry breaking
UR - http://www.scopus.com/inward/record.url?scp=0033435632&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033435632&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0033435632
VL - 68
SP - 987
EP - 993
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 3
ER -