278 citations · 572 across the 11 of their papers we have counts for
11 papers
Band geometry, Berry curvature and superfluid weight
Long Liang, Tuomas I. Vanhala, Sebastiano Peotta +3
We present a theory of the superfluid weight in multiband attractive Hubbard models within the Bardeen-Cooper-Schrieffer (BCS) mean field framework. We show how to separate the geo…
Topological phase transitions in the repulsively interacting Haldane-Hubbard model
Tuomas I. Vanhala, Topi Siro, Long Liang +3
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 p…
Exact diagonalization of quantum lattice models on coprocessors
Topi Siro, Ari Harju
We implement the Lanczos algorithm on an Intel Xeon Phi coprocessor and compare its performance to a multi-core Intel Xeon CPU and an NVIDIA graphics processor. The Xeon and the Xe…
Impurities and Landau level mixing in a fractional quantum Hall state in a flatband lattice model
Topi Siro, Mikko Ervasti, Ari Harju
We study the toplogical checkerboard lattice model around the fractional quantum Hall phase using numerical exact diagonalization without Landau level projections.…
Non-adiabatic charge state transitions in singlet-triplet qubits
Tuukka Hiltunen, Juha Ritala, Topi Siro +1
In double quantum dot singlet-triplet qubits, the exchange interaction is used in both quantum gate operation and the measurement of the state of the qubit. The exchange can be con…
Enhancement models of momentum densities of annihilating electron-positron pairs: the many-body picture of natural geminals
Ilja Makkonen, Mikko M. Ervasti, Topi Siro +1
The correlated motion of a positron surrounded by electrons is a fundamental many-body problem. We approach this by modeling the momentum density of annihilating electron-positron…