Why are insulators insulatingand metals conducting?

R Resta - Journal of Physics: Condensed Matter, 2002 - iopscience.iop.org
At variance with what happens in metals, the electronic charge in insulators cannot flow
freely under an applied dc field, and undergoes instead static polarization. These two …

Quantum critical points and the sign problem

R Mondaini, S Tarat, RT Scalettar - Science, 2022 - science.org
The “sign problem”(SP) is a fundamental limitation to simulations of strongly correlated
matter. It is often argued that the SP is not intrinsic to the physics of particular Hamiltonians …

One-dimensional flat bands in twisted bilayer germanium selenide

DM Kennes, L ** in a nonsliding lattice
K Viebahn, AS Walter, E Bertok, Z Zhu, M Gächter… - Physical Review X, 2024 - APS
A topological “Thouless” pump represents the quantized motion of particles in response to a
slow, cyclic modulation of external control parameters. The Thouless pump, like the quantum …

Quantum embedding for molecules using auxiliary particles–the ghost Gutzwiller Ansatz

C Mejuto-Zaera - Faraday Discussions, 2024 - pubs.rsc.org
Strong/static electronic correlation mediates the emergence of remarkable phases of matter,
and underlies the exceptional reactivity properties in transition metal-based catalysts …

Two-site entropy and quantum phase transitions in low-dimensional models

Ö Legeza, J Sólyom - Physical review letters, 2006 - APS
We propose a new approach to study quantum phase transitions in low-dimensional lattice
models. It is based on studying the von Neumann entropy of two neighboring central sites in …

Topological phase transitions in the repulsively interacting Haldane-Hubbard model

TI Vanhala, T Siro, L Liang, M Troyer, A Harju… - Physical review letters, 2016 - APS
Using dynamical mean-field theory and exact diagonalization we study the phase diagram
of the repulsive Haldane-Hubbard model, varying the interaction strength and the sublattice …

Splitting of topological charge pum** in an interacting two-component fermionic Rice-Mele Hubbard model

E Bertok, F Heidrich-Meisner, AA Aligia - Physical Review B, 2022 - APS
A Thouless pump transports an integer amount of charge when pum** adiabatically
around a singularity. We study the splitting of such a critical point into two separate critical …

Universality and critical exponents of the fermion sign problem

R Mondaini, S Tarat, RT Scalettar - Physical Review B, 2023 - APS
Initial characterizations of the fermion sign problem focused on its evolution with spatial
lattice size L and inverse temperature β, emphasizing the implications of the exponential …