Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-06-11
Physica B 403 (2008) 1447
Physics
Condensed Matter
Strongly Correlated Electrons
2 Pages; Proc. of SCES'07, Houston
Scientific paper
10.1016/j.physb.2007.10.168
We have constructed a systematic low-energy effective theory for hole- and electron-doped antiferromagnets, where holes reside in momentum space pockets centered at $(\pm\frac{\pi}{2a},\pm\frac{\pi}{2a})$ and where electrons live in pockets centered at $(\frac{\pi}{a},0)$ or $(0,\frac{\pi}{a})$. The effective theory is used to investigate the magnon-mediated binding between two holes or two electrons in an otherwise undoped system. We derive the one-magnon exchange potential from the effective theory and then solve the corresponding two-quasiparticle Schr\"odinger equation. As a result, we find bound state wave functions that resemble $d_{x^2-y^2}$-like or $d_{xy}$-like symmetry. We also study possible ground states of lightly doped antiferromagnets.
Brügger C.
Hofmann Christoph P.
Kämpfer F.
Moser Michael
Pepe Michele
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