https://doi.org/10.1140/epjb/e2006-00398-y
Magnon-mediated binding between holes in an antiferromagnet
1
Institute for Theoretical Physics, Bern University, Sidlerstrasse 5, 3012 Bern, Switzerland
2
Istituto Nazionale di Fisica Nucleare and Dipartimento di Fisica, Università di Milano-Bicocca, 3 Piazza della Scienza, 20126 Milano, Italy
Corresponding author: a fkampfer@itp.unibe.ch
Received:
8
June
2006
Revised:
3
October
2006
Published online:
1
November
2006
The long-range forces between holes in an antiferromagnet are due to magnon exchange. The one-magnon exchange potential between two holes is proportional to cos(2 ϕ)/r 2 where r is the distance vector of the holes and ϕ is the angle between r and an axis of the square crystal lattice. One-magnon exchange leads to bound states of holes with antiparallel spins resembling d-wave symmetry.
PACS: 12.39.Fe – Chiral Lagrangians / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 75.30.Ds – Spin waves / 75.50.Ee – Antiferromagnetics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006
