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Excitonic versus electron-hole liquid phases in Tm[Se,Te] compounds
Franz X. Bronold, Holger Fehske, Gerd Roepke
We discuss, from a theoretical point of view, excitonic phases at the pressure induced semiconductor-semimetal transition in ,focusing, in particular, on…
Carrier-density effects in many-polaron systems
Martin Hohenadler, Georg Hager, Gerhard Wellein +1
Many-polaron systems with finite charge-carrier density are often encountered experimentally. However, until recently, no satisfactory theoretical description of these systems was…
Phase diagram of the spin-Peierls chain with local coupling
Alexander Weisse, Georg Hager, Alan R. Bishop +1
We explore the ground-state phase diagram of a Heisenberg spin chain coupled locally to optical phonons (bond coupling), using large-scale density matrix renormalization group calc…
The spin-Peierls chain revisited
Georg Hager, Alexander Weisse, Gerhard Wellein +2
We extend previous analytical studies of the ground-state phase diagram of a one-dimensional Heisenberg spin chain coupled to optical phonons, which for increasing spin-lattice cou…
Stochastic Green's function approach to disordered systems
A. Alvermann, H. Fehske
Based on distributions of local Green's functions we present a stochastic approach to disordered systems. Specifically we address Anderson localisation and cluster effects in binar…
On the possibility of an excitonic insulator at the semiconductor-semimetal transition
Franz X. Bronold, Holger Fehske
We calculate the critical temperature below which an excitonic insulator exists at the pressure-induced semiconductor-semimetal transition. Our approach is based on an effective-ma…