628 citations · 2.6k across the 33 of their papers we have counts for
13 papers · 1 filter
Coexistence of ergodic and non-ergodic behavior and level spacing statistics in a one-dimensional model of a flat band superconductor
Meri Teeriaho, Ville-Vertti Linho, Koushik Swaminathan +1
Motivated by recent studies of the projected dice lattice Hamiltonian [K. Swaminathan et al., Phys. Rev. Research 5, 043215 (2023)], we introduce the on-site/bond singlet (OBS) mod…
Superfluid weight in the isolated band limit within the generalized random phase approximation
Minh Tam, Sebastiano Peotta
The superfluid weight of a generic lattice model with attractive Hubbard interaction is computed analytically in the isolated band limit within the generalized random phase approxi…
Signatures of many-body localization of quasiparticles in a flat band superconductor
Koushik Swaminathan, Poula Tadros, Sebastiano Peotta
We construct a class of exact eigenstates of the Hamiltonian obtained by projecting the Hubbard interaction term onto the flat band subspace of a generic lattice model. These exact…
Suppression of non-equilibrium quasiparticle transport in flat band superconductors
Ville A. J. Pyykkönen, Sebastiano Peotta, Päivi Törmä
We study non-equilibrium transport through a superconducting flat-band lattice in a two-terminal setup with the Schwinger-Keldysh method. We find that quasiparticle transport is su…
Superconductivity, generalized random phase approximation and linear scaling methods
Sebastiano Peotta
The superfluid weight is an important observable of superconducting materials since it is related to the London penetration depth of the Meissner effect. It can be computed from th…
Universal suppression of superfluid weight by disorder independent of quantum geometry and band dispersion
Alexander Lau, Sebastiano Peotta, Dmitry I. Pikulin +2
Motivated by the experimental progress in controlling the properties of the energy bands in superconductors, significant theoretical efforts have been devoted to study the effect o…
Superfluidity and Quantum Geometry in Twisted Multilayer Systems
P. Törmä, S. Peotta, B. A. Bernevig
Designer 2D materials where the constituent layers are not aligned may result in band structures with dispersionless, "flat" bands. Twisted bilayer graphene has been found to show…
Quantum metric and effective mass of a two-body bound state in a flat band
Paivi Torma, Long Liang, Sebastiano Peotta
We consider two-body bound states in a flat band of a multiband system. The existence of pair dispersion predicts the possibility of breaking the degeneracy of the band and creatin…
Wave packet dynamics of Bogoliubov quasiparticles: quantum metric effects
Long Liang, Sebastiano Peotta, Ari Harju +1
We study the dynamics of the Bogoliubov wave packet in superconductors and calculate the supercurrent carried by the wave packet. We discover an anomalous contribution to the super…
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…
Superfluidity in topologically nontrivial flat bands
Sebastiano Peotta, Päivi Törmä
Topological invariants built from the periodic Bloch functions characterize new phases of matter, such as topological insulators and topological superconductors. The most important…
Superconducting Memristors
Sebastiano Peotta, Massimiliano Di Ventra
In his original work Josephson predicted that a phase-dependent conductance should be present in superconducting tunnel junctions, an effect difficult to detect, mainly because it…
Josephson current in a four terminal superconductor - exciton condensate - superconductor system
Sebastiano Peotta, Marco Gibertini, Fabrizio Dolcini +5
We investigate the transport properties of a bilayer exciton condensate that is contacted by four superconducting leads. We focus on the equilibrium regime and investigate how the…