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Coherent impurity motion in a strongly correlated hard-core boson quantum solid | | Efstratios Manousakis
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14 Jun 2006 | | Subject: | Strongly Correlated Electrons; Statistical Mechanics | | Abstract: | A quantum lattice gas model is proposed to capture the essential aspects of the motion of an impurity in a purely bosonic strongly correlated quantum solid (such as a He-3 atom in solid He-4). Within the ``spin’’-wave approximation the model reduces to an effective Hamiltonian in which the impurity motion couples linearly to bosonic excitations and in the non-crossing approximation we solve the Dyson’s equations for the impurity Green’s functions for the square lattice. We find that both substitutional and interstitial impurity quasiparticles form sharp well-defined coherent low-energy excitations. We discuss the possible relevance of our results to the superfluidity of solid He-4. | | Source: | arXiv, cond-mat/0606383 | | Services: | Forum | Review | PDF | Favorites | |
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