4 papers
Quantum correlations in the spin-1/2 Heisenberg XXZ chain with modulated Dzyaloshinskii-Moriya interaction
F. Khastehdel Fumani, B. Beradze, S. Nemati +2
We study a one-dimensional spin-1/2 XXZ Heisenberg model with alternating Dzyaloshinskii- Moriya interaction, using the numerical Lanczos method. Recently, the ground state (GS) ph…
Fidelity approach: the misleading role of finite size level crossing of excited energies
Somayyeh Nemati, Fatemeh Khastehdel Fumani, Saeed Mahdavifar
Here, we show that, although quantum fidelity can truly identify two quantum phase transitions of a one-dimensional spin-1/2 quantum Ising model with competing nearest and next-nea…
One-particle spectral function singularities in a one-dimensional gas of spin-1/2 fermions with repulsive delta-function interaction
T. Cadez, S. Nemati, J. M. P. Carmelo
The momentum, fermionic density, spin density, and interaction dependencies of the exponents that control the (momentum-energy)-plane singular features of the one-fermion spectral…
Absence of ballistic charge transport in the half-filled 1D Hubbard model
J. M. P. Carmelo, S. Nemati, T. Prosen
Whether in the thermodynamic limit of lattice length infinite, hole concentration tending to zero, nonzero temperature, and U/t > 0 the charge stiffness of the 1D Hubbard model wit…