108 citations · 185 across the 6 of their papers we have counts for
6 papers
Quantized single-particle Thouless pump induced by topology transfer from a Chern insulator at finite temperature
Lukas Wawer, Razmik Unanyan, Michael Fleischhauer
Quantized particle or spin transport upon cyclic parameter variations, determined by topological invariants, is a key signature of Chern insulators in the ground state. While measu…
topological invariants for mixed states of fermions in time-reversal invariant band structures
Lukas Wawer, Michael Fleischhauer
The topological classification of fermion systems in mixed states is a long standing quest. For Gaussian states, reminiscent of non-interacting unitary fermions, some progress has…
Chern number and Berry curvature for Gaussian mixed states of fermions
Lukas Wawer, Michael Fleischhauer
We generalize the concept of topological invariants for mixed states based on the ensemble geometric phase (EGP) introduced for one-dimensional lattice models to two dimensions. In…
Quantized transport induced by topology transfer between coupled one-dimensional lattice systems
Lukas Wawer, Rui Li, Michael Fleischhauer
We show that a topological pump in a one-dimensional (1D) insulator can induce a strictly quantized transport in an auxiliary chain of non-interacting fermions weakly coupled to th…
Probing the topology of density matrices
Charles-Edouard Bardyn, Lukas Wawer, Alexander Altland +2
The mixedness of a quantum state is usually seen as an adversary to topological quantization of observables. For example, exact quantization of the charge transported in a so-calle…
Reservoir-induced Thouless pumping and symmetry protected topological order in open quantum chains
Dominik Linzner, Lukas Wawer, Fabian Grusdt +1
We introduce a classification scheme for symmetry protected topological phases applicable to stationary states of open systems based on a generalization of the many-body polarizati…