3 citations · 5 across the 2 of their papers we have counts for
4 papers
The microscopic theory of superfluid He
J. X. Zheng-Johansson, B. Johansson, P-I. Johansson
We present a microscopic theory of superfluid He, formulated using the overall experimental observations as input information. With the theory of a consistent basis, we answer…
The superfluidity mechanism of He II
J. X. Zheng-Johansson, B. Johansson, P-I. Johansson
Based on a first principles treatment of the excitation states we show that superfluidity of superfluid He (He II) results from a reduction in the number of phonon wavevector $…
Theory of strongly correlated f and d-electron systems. I. Exact Hamiltonian, Hubbard-Anderson models and perturbation theory near atomic limit within non-orthogonal basis set
Igor Sandalov, Borje Johansson, Olle Eriksson
The theory of correlated electron systems is formulated in a form which allows to use as a reference point an ab initio band structure theory (AIBST). The theory is constructed in…
Application of the Exact Muffin-Tin Orbitals Theory: the Spherical Cell Approximation
L. Vitos, H. L. Skriver, B. Johansson +1
We present a self-consistent electronic structure calculation method based on the {\it Exact Muffin-Tin Orbitals} (EMTO) Theory developed by O. K. Andersen, O. Jepsen and G. Krier…