TY - JOUR
T1 - Intermediate-coupling theory for the spectral weight of a spin polaron
AU - Yang, Min Fong
PY - 1997
Y1 - 1997
N2 - Within the intermediate-coupling theory, the quasiparticle weight Z of one hole injected into the undoped antiferromagnetic ground state is studied. We find that, for the hole located at the quasiparticle band minimum with momentum (Formula presented)=(±π/2,±π/2), Z is finite. By comparing the results obtained by the self-consistent Born approximation, we show that the intermediate-coupling theory for Z is appropriate only when J/t≳1.6. Finally, the reason why this approach fails in the small-J case will also be clarified.
AB - Within the intermediate-coupling theory, the quasiparticle weight Z of one hole injected into the undoped antiferromagnetic ground state is studied. We find that, for the hole located at the quasiparticle band minimum with momentum (Formula presented)=(±π/2,±π/2), Z is finite. By comparing the results obtained by the self-consistent Born approximation, we show that the intermediate-coupling theory for Z is appropriate only when J/t≳1.6. Finally, the reason why this approach fails in the small-J case will also be clarified.
UR - http://www.scopus.com/inward/record.url?scp=0002168809&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.55.56
DO - 10.1103/PhysRevB.55.56
M3 - 文章
AN - SCOPUS:0002168809
SN - 1098-0121
VL - 55
SP - 56
EP - 58
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 1
ER -