ISSN:
1572-9605
Schlagwort(e):
d-Wave Paring
;
Strongly Correlated Electron-Phonon Systems
;
Berry Phases
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Elektrotechnik, Elektronik, Nachrichtentechnik
,
Physik
Notizen:
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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00727424
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