Zobrazeno 1 - 10
of 142
pro vyhledávání: '"Horsch, Peter"'
Publikováno v:
Phys. Rev. B {\b 103}, 035129 (2021)
We explore the competiton of doped holes and defects that leads to the loss of orbital order in vanadate perovskites. In compounds such as La$_{1-{\sf x}}$Ca$_{\,\sf x}$VO$_3$ spin and orbital order result from super-exchange interactions described b
Externí odkaz:
http://arxiv.org/abs/2012.11919
Publikováno v:
Phys. Rev. Lett. 122, 127206 (2019)
We explore mechanisms of orbital order decay in doped Mott insulators $R_{1-x}$(Sr,Ca)$_x$VO$_3$ ($R=\,$Pr,Y,La) caused by charged (Sr,Ca) defects. Our unrestricted Hartree-Fock analysis focuses on the combined effect of random, charged impurities an
Externí odkaz:
http://arxiv.org/abs/1811.09009
Publikováno v:
In Journal of Magnetism and Magnetic Materials 1 June 2022 551
Publikováno v:
Phys. Rev. B 97, 155104 (2018)
We explore the effects of disordered charged defects on the electronic excitations observed in the photoemission spectra of doped transition metal oxides in the Mott insulating regime by the example of the $R_{1-x}$Ca$_x$VO$_3$ perovskites, where $R=
Externí odkaz:
http://arxiv.org/abs/1710.05171
Publikováno v:
Phys. Rev. Lett. 115, 206403 (2015)
We elucidate the effects of defect disorder and $e$-$e$ interaction on the spectral density of the defect states emerging in the Mott-Hubbard gap of doped transition-metal oxides, such as Y$_{1-x}$Ca$_{x}$VO$_{3}$. A soft gap of kinetic origin develo
Externí odkaz:
http://arxiv.org/abs/1510.04450
Publikováno v:
Physical Review B 92, 054423 (2015)
We investigate the phase diagram and the spin-orbital entanglement of a one-dimensional SU(2)$\otimes XXZ$ model with SU(2) spin exchange and anisotropic $XXZ$ orbital exchange interactions and negative exchange coupling. As a unique feature, the spi
Externí odkaz:
http://arxiv.org/abs/1507.07103
Publikováno v:
New Journal of Physics 17, 083009 (2015)
To demonstrate the role played by the von Neumann entropy spectra in quantum phase transitions we investigate the one-dimensional anisotropic SU(2)$\otimes XXZ$ spin-orbital model with negative exchange parameter. In the case of classical Ising orbit
Externí odkaz:
http://arxiv.org/abs/1501.04022
Publikováno v:
Phys. Rev. B 90, 094413 (2014)
We consider a class of one-dimensional compass models with antisymmetric Dzyaloshinskii-Moriya exchange interaction in an external magnetic field. Based on the exact solution derived by means of Jordan-Wigner transformation, we study the excitation g
Externí odkaz:
http://arxiv.org/abs/1409.5850
Publikováno v:
Physical Review B 89, 104425 (2014)
We present an exact solution for a class of one-dimensional compass models which stand for interacting orbital degrees of freedom in a Mott insulator. By employing the Jordan-Wigner transformation we map these models on noninteracting fermions and di
Externí odkaz:
http://arxiv.org/abs/1403.5455
Publikováno v:
Phys. Rev. B 90, 024404 (2014)
We explore with exact diagonalization the propagation of a single hole in four magnetic phases of the t-J-like Kitaev-Heisenberg model on a honeycomb lattice: the Neel antiferromagnetic, stripe, zigzag and Kitaev spin-liquid phase. We find coherent p
Externí odkaz:
http://arxiv.org/abs/1308.3373