Publications (32)
Buried topological edge state associated with interface between topological band insulator and Mott insulator
H. Ishida, A. Liebsch
The electronic structure at the interface between a topological band insulator and a Mott insulator is studied within layer dynamical mean field theory. To represent the bulk phase…
Doping-driven Mott transition in La_{1-x}Sr_xTiO_3 via simultaneous electron and hole doping of t2g subbands
A. Liebsch
The insulator to metal transition in LaTiO_3 induced by La substitution via Sr is studied within multi-band exact diagonalization dynamical mean field theory at finite temperatures…
Correlated Dirac Fermions on the Honeycomb Lattice studied within Cluster Dynamical Mean Field Theory
A. Liebsch
The role of non-local Coulomb correlations in the honeycomb lattice is investigated within cluster dynamical mean field theory combined with finite-temperature exact diagonalizatio…
Photoemission Quasi-Particle Spectra of SrRuO
A. Liebsch, A. Liechtenstein
Multi-band quasi-particle calculations based on perturbation theory and dynamical mean field methods show that the creation of a photoemission hole state in SrRuO is associ…
Mott transition in multi-orbital systems
A. Liebsch
Metal insulator transitions driven by local Coulomb interactions are among the most fascinating phenomena in condensed matter physics. They occur in a large variety of transition m…
Spectral weight of doping-induced states in the 2D Hubbard model
A. Liebsch
The spectral weight of states induced in the Mott gap via hole doping in the two-dimensional Hubbard model is studied within cluster dynamical mean field theory combined with finit…
Electronic versus Phononic Friction of Xenon on Silver
A. Liebsch, S. Goncalves, M. Kiwi
Molecular dynamics simulations of a Xe monolayer sliding on Ag(001) and Ag(111) are carried out in order to ascertain the microscopic origin of friction. For several values of the…
Quantum phase transition in the two-band Hubbard model
T. A. Costi, A. Liebsch
The interaction between itinerant and Mott localized electronic states in strongly correlated materials is studied within dynamical mean field theory in combination with the numeri…
Magnetization dynamics in dysprosium orthoferrites via inverse Faraday effect
C. A. Perroni, A. Liebsch
The ultrafast non-thermal control of magnetization has recently become feasible in canted antiferromagnets through photomagnetic instantaneous pulses [A.V. Kimel {\it et al.}, Natu…
Coulomb Correlations and Orbital Polarization in the Metal Insulator Transition of VO_2
A. Liebsch, H. Ishida, G. Bihlmayer
The quasi-particle spectra in the metallic rutile and insulating monoclinic phases of VO are shown to be dominated by local Coulomb interactions. In the rutile phase the small…
Comment on: "Orbital-selective Mott transitions in the anisotropic two-band Hubbard model at finite temperatures" by C. Knecht, N. Bluemer, and P. G. J. van Dongen, cond-mat/0505106
A. Liebsch
A detailed comparison of QMC/DMFT results for the non-isotropic two-band Hubbard model by Liebsch [Phys. Rev. B 70, 165103 (2004)] and C. Knecht, N. Bluemer, and P. G. J. van Donge…
Coulomb correlations do not fill the e'_g hole pockets in Na_{0.3}CoO_2
A. Liebsch, H. Ishida
There exists presently considerable debate over the question whether local Coulomb interactions can explain the absence of the small e'_g Fermi surface hole pockets in photoemissio…
Embedding approach for dynamical mean field theory of strongly correlated heterostructures
H. Ishida, A. Liebsch
We present an embedding approach based on localized basis functions which permits an efficient application of the dynamical mean field theory (DMFT) to inhomogeneous correlated mat…
Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO_2
H. Ishida, M. D. Johannes, A. Liebsch
The t2g quasi-particle spectra of Na_0.3CoO_2 are calculated within the dynamical mean field theory. It is shown that as a result of dynamical Coulomb correlations charge is transf…
Exact Diagonalization Dynamical Mean Field Theory for Multi-Band Materials: Effect of Coulomb correlations on the Fermi surface of Na_0.3CoO_2
C. A. Perroni, H. Ishida, A. Liebsch
Dynamical mean field theory combined with finite-temperature exact diagonalization is shown to be a suitable method to study local Coulomb correlations in realistic multi-band mate…
Surface versus bulk Mott transition in CaLaVO
A. Liebsch
The Mott insulator LaVO is known to become metallic if La is replaced by small concentrations of Ca. Since surface quasi-particle spectra of various perovskites are more strong…
Novel Mott Transitions in Non-Isotropic Two-Band Hubbard Model
A. Liebsch
The Mott transition in a two-band Hubbard model involving subbands of different widths is studied as a function of temperature using dynamical mean field theory combined with exact…
Comment on "Absence of spin liquid in non-frustrated correlated systems"
A. Liebsch
In a recent Letter, Hassan and Sénéchal [1] discussed the existence of a spin-liquid phase of the half-filled Hubbard model on the honeycomb lattice. Using schemes, such as the v…
Coulomb blockade and Kondo effect in the electronic structure of Hubbard molecules connected to metallic leads: a finite-temperature exact-diagonalization study
H. Ishida, A. Liebsch
The electronic structure of small Hubbard molecules coupled between two non-interacting semi-infinite leads is studied in the low bias-voltage limit. To calculate the finite-temper…
Surface vs. bulk Coulomb correlations in photoemission spectra of perovskites
A. Liebsch
Recent photoemission spectra of the perovskite series SrCaVO revealed strong modifications associated with surface contributions. To study the effect of Coulomb cor…
The role of surface plasmons in the decay of image-potential states on silver surfaces
A. Garcia-Lekue, J. M. Pitarke, E. V. Chulkov +2
The combined effect of single-particle and collective surface excitations in the decay of image-potential states on Ag surfaces is investigated, and the origin of the long-standing…
Subband filling and Mott transition in Ca_{2-x}Sr_xRuO_4
A. Liebsch, H. Ishida
A new concept is proposed for the paramagnetic metal insulator transition in the layer perovskite Ca_{2-x}Sr_xRuO_4. Whereas the pure Sr compound is metallic up to very large Coulo…
Comment on ``Orbital-selective Mott transitions in two-band Hubbard models''
A. Liebsch
A recent paper by Bluemer et al. [cond-mat/0609758] again criticizes earlier QMC/DMFT results by Liebsch [Phys. Rev. B {\bf 70}, 165103 (2004)]. This criticism is shown to be unfou…
The Mott insulator LaTiO_3 in heterostructures with SrTiO_3 is metallic
H. Ishida, A. Liebsch
It is shown that LaTiO_3 in superlattices with SrTiO_3 is not a Mott insulator but a strongly correlated metal. The tetragonal lattice geometry imposed by the SrTiO_3 substrate lea…
Absence of orbital-selective Mott transition in Ca_2-xSr_xRuO4
A. Liebsch
Quasi-particle spectra of the layer perovskite SrRuO are calculated within Dynamical Mean Field Theory for increasing values of the on-site Coulomb energy . At small …
Non-Fermi-liquid phases in the two-band Hubbard model: Finite-temperature exact diagonalization study of Hund's rule coupling
A. Liebsch, T. A. Costi
The two-band Hubbard model involving subbands of different widths is investigated via finite-temperature exact diagonalization (ED) and dynamical mean field theory (DMFT). In contr…
Mott transition in two-dimensional frustrated compounds
A. Liebsch, H. Ishida, J. Merino
The phase diagrams of isotropic and anisotropic triangular lattices with local Coulomb interactions are evaluated within cluster dynamical mean field theory. As a result of partial…
Multisite versus multiorbital Coulomb correlations studied within finite-temperature exact diagonalization dynamical mean-field theory
A. Liebsch, H. Ishida, J. Merino
The influence of short-range Coulomb correlations on the Mott transition in the single-band Hubbard model at half-filling is studied within cellular dynamical mean field theory for…
Quasi-particle spectra of perovskites: Enhanced Coulomb correlations at surfaces
A. Liebsch
Photoemission spectra of the perovskites CaSrVO, CaLaVO, and SrRuO indicate that Coulomb correlations are more pronounced at the surface than in…
Correlation induced spin freezing transition in FeSe: a dynamical mean field study
A. Liebsch, H. Ishida
The effect of local Coulomb interactions on the electronic properties of FeSe is explored within dynamical mean field theory combined with finite-temperature exact diagonalization.…
Single Mott Transition in Multi-Orbital Hubbard Model
A. Liebsch
The Mott transition in a multi-orbital Hubbard model involving subbands of different widths is studied within the dynamical mean field theory. Using the iterated perturbation theor…
Role of occupied d bands in the dynamics of excited electrons and holes in Ag
A. Garcia-Lekue, J. M. Pitarke, E. V. Chulkov +2
The role that occupied bands play in the inelastic lifetime of bulk and surface states in Ag is investigated from the knowledge of the quasiparticle self-energy. In the case of…