8 citations · 11 across the 6 of their papers we have counts for
7 papers
Thermodynamics of the Fermi-Hubbard Model through Stochastic Calculus and Girsanov Transformation
Detlef Lehmann
We apply the methodology of our recent paper 'The Dynamics of the Hubbard Model through Stochastic Calculus and Girsanov Transformation' [1] to thermodynamic correlation functions…
The Dynamics of the Hubbard Model through Stochastic Calculus and Girsanov Transformation
Detlef Lehmann
As a typical quantum many body problem, we consider the time evolution of density matrix elements in the Bose-Hubbard model. For an arbitrary initial state, these quantities can be…
Exact Diagonalization of the Fractional Quantum Hall Many-Body Hamiltonian in the Lowest Landau Level
Detlef Lehmann
For a gaussian interaction V(x,y)=λe^{-(x^2+y^2)/r^2} with long range r>>l_B, l_B the magnetic length, we rigorously prove that the eigenvalues of the finite volume Hamiltonian H_{…
Resummation of Feynman Diagrams and the Inversion of Matrices
Detlef Lehmann
In many field theoretical models one has to resum two- and four-legged subdiagrams in order to determine their behaviour. In this article we present a novel formalism which does th…
The Global Minimum of the Effective Potential of the Many-Electron System with Delta-Interaction
Detlef Lehmann
We prove that the global minimum of the real part of the full effective potential of the many-electron system with attractive delta-interaction is in fact given by the BCS mean fie…
The Many-Electron System in the Forward, Exchange and BCS Approximation
Detlef Lehmann
The nonrelativistic many-electron system in the forward, exchange and BCS approximation is considered. In this approximation, which is still quartic in the annihilation and creatio…