Spin-charge separation in angle-resolved photoemission spectra

Angle resolved photoemission spectroscopy reveals spin charge separation in metallic MoSe2 grain boundary

Material line defects are one-dimensional structures but the search and proof of electron behaviour consistent with the reduced dimension of such defects has been so far unsuccessful. Here we show using angle resolved photoemission spectroscopy that twin-grain boundaries in the layered semiconductor MoSe2 exhibit parabolic metallic bands. The one-dimensional nature is evident from a charge dens...

Angle-resolved photoemission study of MX-chain compound [Ni(chxn)2Br]Br2: absence of spin-charge separation signals

We report on the results of angle-resolved photoemission experiments on a quasi-one-dimensional MX-chain compound [Ni(chxn)2Br]Br2 (chxn = 1R,2R-cyclohexanediamine), a one-dimensional Heisenberg system with S = 1/2 and J ∼ 3600 K, which shows a gigantic non-linear optical effect. A ”band” having about 500 meV energy dispersion is found in the first half of the Brillouin zone (0 ≤ kb/π < 1/2), b...

The angle-resolved photoemission spectra of uranium based ferromagnets

We investigate the spin-split and magnetization dependence of the 5f angle resolved photoemission spectra. For large values of the spontaneous magnetization, the model supports magnetic polaron excitations. We compare the results of our calculations with recent experimental results of Durakiewicz, Joyce and co-workers on related 5f compounds.

Angle-resolved photoemission spectra of the Hubbard model

We discuss spectra calculated for the two-dimensional Hubbard model in the intermediate coupling regime with the dynamical cluster approximation, which is a nonperturbative approach. We find a crossover from a normal Fermi liquid with a Fermi surface closed around the Brillouin-zone center at large doping to a nonFermi liquid for small doping where the Fermi surface is holelike, closed around M...

Angle resolved resonant photoemission in transition metals