Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Max Planck Institute for Gravitational PhysicsDE1.5k papers
- Max Planck Institute for Extraterrestrial PhysicsDE1.4k papers
- Max Planck Institute for AstrophysicsDE1.2k papers
- Max Planck Institute for Nuclear PhysicsDE1.1k papers
- Centre National de la Recherche ScientifiqueFR986 papers
- Max Planck Institute for the Physics of Complex SystemsDE799 papers
- Max Planck Institute for MathematicsDE519 papers
- Heidelberg UniversityDE513 papers
- Max Planck Institute for PhysicsDE507 papers
- Max Planck Institute for Solar System ResearchDE483 papers
- California Institute of TechnologyUS481 papers
- National Institute for AstrophysicsIT450 papers
39 papers · 2 filters
Quantum emulsion: a glassy phase of bosonic mixtures in optical lattices
Tommaso Roscilde, J. Ignacio Cirac
We numerically investigate mixtures of two interacting bosonic species with unequal parameters in one-dimensional optical lattices. In large parameter regions full phase segregatio…
Field induced quantum phase transition in the anisotropic Kondo necklace model
P. Thalmeier, A. Langari
The anisotropic Kondo necklace model in 2D and 3D is treated as a genuine model for magnetic to Kondo singlet quantum phase transitions in the heavy fermion (HF) compounds. The var…
Renormalization of the quasiparticle hopping integrals by spin interactions in layered copper oxides
L. Hozoi, S. Nishimoto, C. de Graaf
Holes doped within the square CuO2 network specific to the cuprate superconducting materials have oxygen 2p character. We investigate the basic properties of such oxygen holes by w…
Sr(Ba)VO under pressure -- an orbital switch and potential superconductor
R. Arita, A. Yamasaki, K. Held +2
We study Sr(Ba)VO under high pressure by means of the local density approximation + dynamical mean field theory method. While SrVO is a 1/6-filling three-band s…
Exchange interaction between single magnetic adatoms
P. Wahl, P. Simon, L. Diekhoener +4
The magnetic coupling between single Co atoms adsorbed on a copper surface is determined by probing the Kondo resonance using low-temperature scanning tunneling spectroscopy. The K…
Local phonon mode in a fermionic bath, and its relation to Kondo effect
Balázs Dóra
We have studied the interplay of a local phonon mode embedded in a metallic host (Holstein impurity model) using Abelian bosonization. The phonon frequency softens, which takes pla…
Time evolution algorithms for Matrix Product States and DMRG
Juan Jose Garcia-Ripoll
In this work we develop several new simulation algorithms for 1D many-body quantum mechanical systems combining the Matrix Product State variational ansatz with Taylor, Padé and Ar…
Pressure-temperature phase diagram of the heavy-electron superconductor URu2Si2
H. Amitsuka, K. Matsuda, I. Kawasaki +7
The pressure-temperature phase diagram of the heavy-electron superconductor URu2Si2 has been reinvestigated by ac-susceptibility and elastic neutron-scattering (NS) measurements pe…
Kinks in the dispersion of strongly correlated electrons
K. Byczuk, M. Kollar, K. Held +4
The properties of condensed matter are determined by single-particle and collective excitations and their interactions. These quantum-mechanical excitations are characterized by an…
Two-dimensional frustrated spin systems in high magnetic fields
Burkhard Schmidt, Nic Shannon, Peter Thalmeier
We discuss our numerical results on the properties of the S = 1/2 frustrated J1-J2 Heisenberg model on a square lattice as a function of temperature and frustration angle phi = ata…
Charge degrees in the quarter-filled checkerboard lattice
F. Pollmann, J. J. Betouras, E. Runge +1
For a systematic study of charge degrees of freedom in lattices with geometric frustration, we consider spinless fermions on the checkerboard lattice with nearest-neighbor hopping…
Observation of an optical non-Fermi-liquid behavior in the heavy fermion state of YbRhSi
S. Kimura, J. Sichelschmidt, J. Ferstl +3
We report far-infrared optical properties of YbRhSi for photon energies down to 2 meV and temperatures 0.4 -- 300 K. In the coherent heavy quasiparticle state, a linear…
Comparative investigation of the coupled-tetrahedra quantum spin systems Cu2Te2O5X2, X=Cl, Br and Cu4Te5O12Cl4
R. Valenti, T. Saha-Dasgupta, H. O. Jeschke +5
We present a comparative study of the coupled-tetrahedra quantum spin systems Cu2Te2O5X2, X=Cl, Br (Cu-2252(X)) and the newly synthesized Cu4Te5O12Cl4 (Cu-45124(Cl)) based on ab in…
High field magnetisation of the frustrated one dimensional quantum antiferromagnet LiCuVO4
M. G. Banks, F. Heidrich-Meisner, A. Honecker +3
We have investigated the high field magnetisation of the frustrated one dimensional compound LiCuVO4. In zero field, LiCuVO4 undergoes long range antiferromagnetic order at T_{N} ~…
Theoretical investigation of the magnetic structure in YBa_2Cu_3O_6
Ekkehard Krüger
As experimentally well established, YBa_2Cu_3O_6 is an antiferromagnet with the magnetic moments lying on the Cu sites. Starting from this experimental result and the assumption, t…
Spin-rotationally symmetric domain flux phases in underdoped cuprates
Marcin Raczkowski, Didier Poilblanc, Raymond Fresard +1
We propose a new form of inhomogeneous phases consisting of out-of-phase staggered flux domains separated by diagonal charged domain walls centered on bonds or on sites. Remarkably…
Electronic theory for itinerant in-plane magnetic fluctuations in NaCoO
M. M. Korshunov, I. Eremin, A. Shorikov +1
Starting from {\it ab-initio} band structure for NaCoO, we derive the single-electron energies and the effective tight-binding description for the bands using a pr…
Fractional charges and spin-charge separation in one-dimensional Wigner lattices
M. Daghofer, P. Horsch
We study density response N(k,omega) and one-particle spectra A(k,omega) for a Wigner lattice model at quarter filling using exact diagonalization. We investigate these observables…
Electronic structure of charge-ordered Fe3O4 from calculated optical, megneto-optical Kerr effect, and O K-edge x-ray absorption spectra
I. Leonov, A. N. Yaresko, V. N. Antonov +1
The electronic structure of the low-temperature (LT) monoclinic magnetite, Fe3O4, is investigated using the local spin density approximation (LSDA) and the LSDA+U method. The self-…
Metallic State in Cubic FeGe beyond its Quantum Phase Transition
P. Pedrazzini, H. Wilhelm, D. Jaccard +8
We report on results of electrical resistivity and structural investigations on the cubic modification of FeGe under high pressure. The long-wavelength helical order ( K)…
Quantum criticality in the cubic heavy-fermion system CeIn_{3-x}Sn_x
R. Kuechler, P. Gegenwart, J. Custers +5
We report a comprehensive study of CeInSn single crystals close to the antiferromagnetic (AF) quantum critical point (QCP) at …
Slave-boson approach to the metallic stripe phases with large unit cells
Marcin Raczkowski, Raymond Fresard, Andrzej M. Oles
Using a rotationally invariant version of the slave-boson approach in spin space we analyze the stability of stripe phases with large unit cells in the two-dimensional Hubbard mode…
Tomonaga-Luttinger parameters and spin excitations in the dimerized extended Hubbard model
Satoshi Ejima, Florian Gebhard, Satoshi Nishimoto
We study the one-dimensional extended Hubbard model with alternating size of the hopping integrals using the density-matrix renormalization group method. We calculate the spin gap,…
Magnetic properties of spin-orbital polarons in lightly doped cobaltates
M. Daghofer, P. Horsch, G. Khaliullin
We present a numerical treatment of a spin-orbital polaron model for Na_xCoO_2 at small hole concentration (0.7 < x < 1). We demonstrate how the polarons account for the peculiar m…