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- Max Planck Institute for Mathematics in the SciencesDE139 papers
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6 papers · 2 filters
Thermodynamics of the frustrated ferromagnetic spin-1/2 Heisenberg chain
J. Richter, M. Härtel, D. Ihle +1
We studied the thermodynamics of the one-dimensional J1-J2 spin-1/2 Heisenberg chain for ferromagnetic nearest-neighbor bonds J1 < 0 and frustrating antiferromagnetic next-nearest-…
Comprehensive quantum Monte Carlo study of the quantum critical points in planar dimerized/quadrumerized Heisenberg models
Sandro Wenzel, Wolfhard Janke
We study two planar square lattice Heisenberg models with explicit dimerization or quadrumerization of the couplings in the form of ladder and plaquette arrangements. We investigat…
Bound state formation and nature of the excitonic insulator phase in the extended Falicov-Kimball model
D. Ihle, M. Pfafferott, E. Burovski +2
Motivated by the possibility of pressure-induced exciton condensation in intermediate-valence Tm[Se,Te] compounds we study the Falicov-Kimball model extended by a finite f-hole val…
Quantum Andreev Oscillations in normal-superconducting-normal nanostructures
P. Rödiger, P. Esquinazi, N. García
We show that the voltage drop of specially prepared normal-superconducting-normal nanostructures show quantum Andreev oscillations as a function of magnetic field or input current.…
Thermodynamics of Heisenberg ferromagnets with arbitrary spin in a magnetic field
I. Juhász Junger, D. Ihle, L. Bogacz +1
The thermodynamic properties (magnetization, magnetic susceptibility, transverse and longitudinal correlation lengths, specific heat) of one- and two-dimensional ferromagnets with…
A comparison of the magnetic properties of Proton- and Iron-implanted graphite
J. Barzola-Quiquia, R. Höhne, M. Rothermel +3
In this work we have investigated the changes of the magnetic properties of highly oriented pyrolytic graphite samples after irradiation either with protons…