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6 papers · 2 filters
Quantum phase transitions to topological Haldane phases in spin-one chains studied by linked-cluster expansions
P. Adelhardt, J. Gritsch, M. Hille +2
We use linked-cluster expansions to analyze the quantum phase transitions between symmetry unbroken trivial and topological Haldane phases in two different spin-one chains. The fir…
Charge and pairing dynamics in the attractive Hubbard model: mode coupling and the validity of linear-response theory
Jörg Bünemann, Götz Seibold
Pump-probe experiments have turned out as a powerful tool in order to study the dynamics of competing orders in a large variety of materials. The corresponding analysis of the data…
Gutzwiller variational approach to the two-impurity Anderson model at particle-hole symmetry
Thorben Linneweber, Jörg Bünemann, Zakaria M. M. Mahmoud +1
We study Gutzwiller-correlated wave functions as variational ground states for the two-impurity Anderson model (TIAM) at particle-hole symmetry as a function of the impurity separa…
Effects of Interactions on Dynamic Correlations of Hard-Core Bosons at Finite Temperatures
Benedikt Fauseweh, Götz S. Uhrig
We investigate how dynamic correlations of hard-core bosonic excitation at finite temperature are affected by additional interactions besides the hard-core repulsion which prevents…
Singlet exciton condensation and bond-order-wave phase in the extended Hubbard model
Mohsen Hafez-Torbati, Götz S. Uhrig
The competition of interactions implies the compensation of standard mechanisms which leads to the emergence of exotic phases between conventional phases. The extended Hubbard mode…
Direct observation of the Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point
Tao Hong, Masashige Matsumoto, Yiming Qiu +12
Spontaneous symmetry-breaking quantum phase transitions play an essential role in condensed matter physics. The collective excitations in the broken-symmetry phase near the quantum…