Why are insulators insulating and metals conducting?
R Resta - Journal of Physics: Condensed Matter, 2002 - iopscience.iop.org
At variance with what happens in metals, the electronic charge in insulators cannot flow
freely under an applied dc field, and undergoes instead static polarization. These two …
freely under an applied dc field, and undergoes instead static polarization. These two …
Quantization and its breakdown in a Hubbard–Thouless pump
Geometric properties of wave functions can explain the appearance of topological invariants
in many condensed-matter and quantum systems. For example, topological invariants …
in many condensed-matter and quantum systems. For example, topological invariants …
Extended dynamical mean-field theory and method
P Sun, G Kotliar - Physical Review B, 2002 - APS
We develop the extended dynamical mean-field theory (E-DMFT) with a view towards
realistic applications.(1) We introduce an intuitive derivation of the E-DMFT formalism. By …
realistic applications.(1) We introduce an intuitive derivation of the E-DMFT formalism. By …
Splitting of topological charge pum** in an interacting two-component fermionic Rice-Mele Hubbard model
A Thouless pump transports an integer amount of charge when pum** adiabatically
around a singularity. We study the splitting of such a critical point into two separate critical …
around a singularity. We study the splitting of such a critical point into two separate critical …
Quantum critical behavior of the one-dimensional ionic Hubbard model
We study the zero-temperature phase diagram of the half-filled one-dimensional ionic
Hubbard model. This model is governed by the interplay of the on-site Coulomb repulsion …
Hubbard model. This model is governed by the interplay of the on-site Coulomb repulsion …
Interaction-induced charge pum** in a topological many-body system
K Viebahn, AS Walter, E Bertok, Z Zhu… - ar**
We calculate the charge gap Δ EC and the spin gap Δ ES of the ionic Hubbard chain
including electron-hole symmetric density-dependent hop**. The vanishing of Δ EC (Δ …
including electron-hole symmetric density-dependent hop**. The vanishing of Δ EC (Δ …
Nature of the insulating phases in the half-filled ionic Hubbard model
We investigate the ground-state phase diagram of the one-dimensional'ionic'Hubbard model
with an alternating periodic potential at half-filling by numerical diagonalization of finite …
with an alternating periodic potential at half-filling by numerical diagonalization of finite …
Breakdown of topological Thouless pum** in the strongly interacting regime
We elucidate the mechanism for instability of topological Thouless pum** in strongly
interacting systems from a viewpoint of symmetry-protected topological phases. If the …
interacting systems from a viewpoint of symmetry-protected topological phases. If the …