TY - JOUR
T1 - Collective modes in multiband superconductors
T2 - Rigorous study based on the ward-takahashi relations
AU - Koyama, Tomio
N1 - Publisher Copyright:
© 2014 The Physical Society of Japan.
PY - 2014/7/15
Y1 - 2014/7/15
N2 - A rigorous theory based on the Ward-Takahashi (WT) relations originating from U(1) gauge symmetry is presented for the collective phase oscillation modes in multiband superconductors. The existence of the massless Nambu-Goldstone mode in the superconducting state including the time-reversal-symmetry-breaking phase can be rigorously proved by using the WT relations. We also discuss the approximations in calculating the phase oscillation modes in systems with an interaction causing the gap renormalization.
AB - A rigorous theory based on the Ward-Takahashi (WT) relations originating from U(1) gauge symmetry is presented for the collective phase oscillation modes in multiband superconductors. The existence of the massless Nambu-Goldstone mode in the superconducting state including the time-reversal-symmetry-breaking phase can be rigorously proved by using the WT relations. We also discuss the approximations in calculating the phase oscillation modes in systems with an interaction causing the gap renormalization.
UR - http://www.scopus.com/inward/record.url?scp=84911934524&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84911934524&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.83.074715
DO - 10.7566/JPSJ.83.074715
M3 - Article
AN - SCOPUS:84911934524
VL - 83
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 7
M1 - 074715
ER -