Abstract
The Gutzwiller and Hubbard approaches to the Hubbard Hamiltonian are each of a very different nature and lead to some qualitatively different results for certain quantities, for example, for the quasiparticle density of states as a function of the interaction divided by the bandwidth UW. The metal-to-insulator transition occurs for the Hubbard approach at UW 1 and for the Gutzwiller approach at UW=2. We suggest a simple modification of the Gutzwiller theory consisting of the use of a physically reasonable momentum distribution. We find the transition now occurring at UW 1 while the spin susceptibility and compressibility remain finite. Applications to heavy-fermion systems and normal He3 are discussed.
Original language | English |
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Pages (from-to) | 5939-5942 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 34 |
Issue number | 8 |
DOIs | |
State | Published - 1986 |