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Effective action for strongly correlated electron systems |
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| Authors: | A Ferraz EA Kochetov |
| Institution: | a International Institute of Physics - UFRN, Department of Experimental and Theoretical Physics - UFRN, Natal, Brazil b International Institute of Physics - UFRN, Natal, Brazil c Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia |
| Abstract: | The su(2|1) coherent-state path-integral representation of the partition function of the t-J model of strongly correlated electrons is derived at finite doping. The emergent effective action is compared to the one proposed earlier on phenomenological grounds by Shankar to describe holes in an antiferromagnet R. Shankar, Nucl. Phys. B 330 (1990) 433]. The t-J model effective action is found to have an important “extra” factor with no analogue in Shankar?s action. It represents the local constraint of no double electron occupancy and reflects the rearrangement of the underlying phase-space manifold due to the presence of strong electron correlation. This important ingredient is shown to be essential to describe the physics of strongly correlated electron systems. |
| Keywords: | _method=retrieve& _eid=1-s2 0-S0550321311004445& _mathId=si4 gif& _pii=S0550321311004445& _issn=05503213& _acct=C000054348& _version=1& _userid=3837164& md5=1abd9c643dc08ca25694114297ede5b7')" style="cursor:pointer t-J model of strongly correlated electrons" target="_blank">" alt="Click to view the MathML source" title="Click to view the MathML source">t-J model of strongly correlated electrons _method=retrieve& _eid=1-s2 0-S0550321311004445& _mathId=si5 gif& _pii=S0550321311004445& _issn=05503213& _acct=C000054348& _version=1& _userid=3837164& md5=310b9516bc4a7cb2eacae73da94cf222')" style="cursor:pointer su(2|1) coherent-state path integral" target="_blank">" alt="Click to view the MathML source" title="Click to view the MathML source">su(2|1) coherent-state path integral |
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