ISSN:
1572-9605
Keywords:
d-Wave Paring
;
Strongly Correlated Electron-Phonon Systems
;
Berry Phases
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract We use path integral and exact diagonalization techniques to study the tunneling of dopant-induced hole polarons which are self-localized by electron-phonon coupling in a two-dimensional anti-ferromagnet. Their low-energy dynamics is found to be dominated by 2nd and 3rd neighbor hopping processes which carry a (−1) Berry phase factor and lead to non-s-wave hole pairing symmetries, including possiblenodeless $$d_{x^2 - y^2 } $$ pair wavefunctions. The polarons obey effective spin-1/2-fermion quasi-particle statistics. The nodeless $$d_{x^2 - y^2 } $$ -wave pairing state can exhibit a transition from gapless to fully gapped behavior in its quasi-particle excitation spectrum, without change of pairing symmetry.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00727424
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