Bosonization and quantum hydrodynamics |
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Authors: | Girish S Setlur |
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Institution: | (1) Department of Physics, Indian Institute of Technology, Guwahati, North Guwahati, 781 039 Assam, India |
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Abstract: | It is shown that it is possible to bosonize fermions in any number of dimensions using the hydrodynamic variables, namely
the velocity potential and density. The slow part of the Fermi field is defined irrespective of dimensionality and the commutators
of this field with currents and densities are exponentiated using the velocity potential as conjugate to the density. An action
in terms of these canonical bosonic variables is proposed that reproduces the correct current and density correlations. This
formalism in one dimension is shown to be equivalent to the Tomonaga-Luttinger approach as it leads to the same propagator
and exponents. We compute the one-particle properties of a spinless homogeneous Fermi system in two spatial dimensions with
long-range gauge interactions and highlight the metal-insulator transition in the system. A general formula for the generating
function of density correlations is derived that is valid beyond the random phase approximation. Finally, we write down a
formula for the annihilation operator in momentum space directly in terms of number conserving products of Fermi fields. |
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Keywords: | Bosonization hydrodynamics Fermi fluids metal-insulator transition |
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