Systematic low-energy effective field theory for electron-doped antiferromagnets
- Institute for Theoretical Physics, Bern University, Sidlerstrasse 5, CH-3012 Bern (Switzerland)
- Facultad de Ciencias, Universidad de Colima, Bernal Diaz del Castillo 340, Colima Codigo Postal 28045 (Mexico)
- Istituto Nazionale di Fisica Nucleare and Dipartimento di Fisica, Universita di Milano-Bicocca, 3 Piazza della Scienza, 20126 Milan (Italy)
In contrast to hole-doped systems which have hole pockets centered at ({+-}({pi}/2a),{+-}({pi}/2a)), in lightly electron-doped antiferromagnets the charged quasiparticles reside in momentum space pockets centered at (({pi}/a),0) or (0,({pi}/a)). This has important consequences for the corresponding low-energy effective field theory of magnons and electrons which is constructed in this paper. In particular, in contrast to the hole-doped case, the magnon-mediated forces between two electrons depend on the total momentum P-vector of the pair. For P-vector=0, the one-magnon exchange potential between two electrons at distance r is proportional to 1/r{sup 4}, while in the hole case, it has a 1/r{sup 2} dependence. The effective theory predicts that spiral phases are absent in electron-doped antiferromagnets.
- OSTI ID:
- 20951521
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 21; Other Information: DOI: 10.1103/PhysRevB.75.214405; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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