59 citations · 277 across the 22 of their papers we have counts for
22 papers
Lattice in Line: Optimized DMRG ordering for complex lattice geometries
Roman Rausch
The density-matrix renormalization group (DMRG) is a one-dimensional tensor-network technique, but it is not limited to one-dimensional systems: it can be applied to periodic 2D an…
Itinerant magnetism in the triangular lattice Hubbard model at half-doping: Application to twisted transition-metal dichalcogenides
Yuchi He, Roman Rausch, Matthias Peschke +4
We use unrestricted Hartree-Fock, density matrix renormalization group, and variational projected entangled pair state calculations to investigate the ground state phase diagram of…
Terminable Transitions in a Topological Fermionic Ladder
Yuchi He, Dante M. Kennes, Christoph Karrasch +1
Interacting fermionic ladders are important platforms to study quantum phases of matter, such as different types of Mott insulators. In particular, the D-Mott and S-Mott states hol…
Low-energy excitations and transport functions of the one-dimensional Kondo insulator
Robert Peters, Roman Rausch
Using variational matrix product states, we analyze the finite temperature behavior of a half-filled periodic Anderson model in one dimension, a prototypical model of a Kondo insul…
Dynamically generated quadrupole polarization using Floquet adiabatic evolution
Gonzalo Camacho, Christoph Karrasch, Roman Rausch
We investigate the nonequilibrium dynamics of the quantum spin chain subjected to a time-dependent external drive, where the driving frequency is adiabatically decreased as a…
Quantum spin spiral ground state of the ferrimagnetic sawtooth chain
Roman Rausch, Matthias Peschke, Cassian Plorin +2
The ferrimagnetic phase of the sawtooth chain with mixed ferromagnetic nearest-neighbour interactions and antiferromagnetic next-nearest-neighbour interactions (within the…
Minimal one-dimensional model of bad metal behavior from fast particle-hole scattering
Yan-Qi Wang, Roman Rausch, Christoph Karrasch +1
A strongly interacting plasma of linearly dispersing electron and hole excitations in two spatial dimensions (2D), also known as a Dirac fluid, can be captured by relativistic hydr…
Magnetic properties of a capped kagome molecule with 60 quantum spins
Roman Rausch, Matthias Peschke, Cassian Plorin +1
We compute ground-state properties of the isotropic, antiferromagnetic Heisenberg model on the sodalite cage geometry. This is a 60-spin spherical molecule with 24 vertex-sharing t…
Matrix-product state approach to the generalized nuclear pairing Hamiltonian
Roman Rausch, Cassian Plorin, Matthias Peschke +1
We show that from the point of view of the generalized pairing Hamiltonian, the atomic nucleus is a system with small entanglement and can thus be described efficiently using a 1D…
The antiferromagnetic Heisenberg model on the fullerene geometry
Roman Rausch, Cassian Plorin, Matthias Peschke
We solve the quantum-mechanical antiferromagnetic Heisenberg model with spins positioned on vertices of the truncated icosahedron using the density-matrix renormalization group (DM…
Exceptional points in the one-dimensional Hubbard model
Roman Rausch, Robert Peters, Tsuneya Yoshida
Non-Hermitian phenomena offer a novel approach to analyze and interpret spectra in the presence of interactions. Using the density-matrix renormalization group (DMRG), we demonstra…
Topological phases arising from attractive interaction and pair hopping in the Extended Hubbard Model
Roman Rausch, Matthias Peschke
The extended Hubbard model with an attractive density-density interaction, positive pair hopping, or both, is shown to host topological phases, with a doubly degenerate entanglemen…
Magnetic Doublon Bound States in the Kondo Lattice Model
Roman Rausch, Michael Potthoff, Norio Kawakami
We present a novel pairing mechanism for electrons, mediated by magnons. These paired bound states are termed ``magnetic doublons''. Applying numerically exact techniques (full dia…
Pump-probe Auger-electron spectroscopy of Mott insulators
Roman Rausch, Michael Potthoff
In high-resolution core-valence-valence (CVV) Auger electron spectroscopy from the surface of a solid at thermal equilibrium, the main correlation satellite, visible in the case of…
Non-collinear spin states in bottom-up fabricated atomic chains
Manuel Steinbrecher, Roman Rausch, Khai Ton That +5
Non-collinear spin states with unique rotational sense, such as chiral spin-spirals, are recently heavily investigated because of advantages for future applications in spintronics…
Frustrated quantum magnetism in the Kondo lattice on the zigzag ladder
Matthias Peschke, Roman Rausch, Michael Potthoff
The interplay between Kondo effect, indirect magnetic interaction and geometrical frustration is studied in the Kondo lattice on the one-dimensional zigzag ladder. Using the densit…
Filling-dependent doublon dynamics in the one-dimensional Hubbard model
Roman Rausch, Michael Potthoff
The fate of a local two-hole doublon excitation in the one-dimensional Fermi-Hubbard model is systematically studied for strong Hubbard interaction U in the entire filling range us…
Inertia effects in the real-time dynamics of a quantum spin coupled to a Fermi sea
Mohammad Sayad, Roman Rausch, Michael Potthoff
Spin dynamics in the Kondo impurity model, initiated by suddenly switching the direction of a local magnetic field, is studied by means of the time-dependent density-matrix renorma…
One-step theory of two-photon photoemission
J. Braun, R. Rausch, M. Potthoff +1
A theoretical frame for two-photon photoemission is derived from the general theory of pump-probe photoemission, assuming that not only the probe but also the pump pulse is suffici…
Relaxation of a classical spin coupled to a strongly correlated electron system
Mohammad Sayad, Roman Rausch, Michael Potthoff
A classical spin which is antiferromagnetically coupled to a system of strongly correlated conduction electrons is shown to exhibit unconventional real-time dynamics which cannot b…
Multiplons in the two-hole excitation spectra of the one-dimensional Hubbard model
Roman Rausch, Michael Potthoff
Using the density-matrix renormalization group in combination with the Chebyshev polynomial expansion technique, we study the two-hole excitation spectrum of the one-dimensional Hu…
One-step theory of pump-probe photoemission
J. Braun, R. Rausch, M. Potthoff +2
A theoretical frame for pump-probe photoemission is presented. The approach is based on a general formulation using the Keldysh formalism for the lesser Green's function to describ…