17 citations · 40 across the 10 of their papers we have counts for
12 papers
Observation of ring states in a delicate topological insulator
Caroline Tornow, Julia Rupprecht, Pascal Engeler +4
Topological insulators are typically characterized by particularly stable properties, such as global invariants, and can be identified by probing their robust surface states. A rec…
Stability of flat-band Bose-Einstein condensation from the geometry of compact localized states
Kukka-Emilia Huhtinen
We consider Bose-Einstein condensation in flat-band models from a real-space perspective. Using a basis of compact localized states, we reformulate the minimization of the mean-fie…
Interplay of local and global quantum geometry in the stability of flat-band superfluids
Kukka-Emilia Huhtinen, Matteo Dürrnagel, Valerio Peri +1
Quantum geometry strongly impacts physical properties in flat-band systems. We consider its role in bosonic condensation and superfluidity on flat bands, and show that the superflu…
Superfluid stiffness of superconductors with delicate topology
Tijan Prijon, Sebastian D. Huber, Kukka-Emilia Huhtinen
We consider superconductivity in two-dimensional delicate topological bands, where the total Chern number vanishes but the Brillouin zone can be divided into subregions with a quan…
Flat-band ratio and quantum metric in the superconductivity of modified Lieb lattices
Reko P. S. Penttilä, Kukka-Emilia Huhtinen, Päivi Törmä
Flat bands may offer a route to high critical temperatures of superconductivity. It has been predicted that the quantum geometry of the bands as well as the ratio of the number of…
Quantum geometry in superfluidity and superconductivity
Sebastiano Peotta, Kukka-Emilia Huhtinen, Päivi Törmä
We review the theoretical description of the role of quantum geometry in superfluidity and superconductivity of multiband systems, with focus on flat bands where quantum geometry i…
Conductivity in flat bands from the Kubo-Greenwood formula
Kukka-Emilia Huhtinen, Päivi Törmä
Conductivity in a multiband system can be divided into intra- and interband contributions, and the latter further into symmetric and antisymmetric parts. In a flat band, intraband…
Many-Body Superconductivity in Topological Flat Bands
Jonah Herzog-Arbeitman, Aaron Chew, Kukka-Emilia Huhtinen +2
In a flat band superconductor, bosonic excitations can disperse while unpaired electrons are immobile. To study this strongly interacting system, we construct a family of multi-ban…
Revisiting flat band superconductivity: dependence on minimal quantum metric and band touchings
Kukka-Emilia Huhtinen, Jonah Herzog-Arbeitman, Aaron Chew +2
A critical result in superconductivity is that flat bands, though dispersionless, can still host nonzero superfluid weight due to quantum geometry. We show that the derivation of t…
Insulator-pseudogap crossover in the Lieb lattice
Kukka-Emilia Huhtinen, Päivi Törmä
We study the attractive Hubbard model in the Lieb lattice to understand the normal state above the superconducting critical temperature in a flat band system. We use cluster dynami…
Spin-Imbalanced Pairing and Fermi Surface Deformation in Flat Bands
Kukka-Emilia Huhtinen, Marek Tylutki, Pramod Kumar +3
We study the attractive Hubbard model with spin imbalance on two lattices featuring a flat band: the Lieb and kagome lattices. We present mean-field phase diagrams featuring exotic…
Electron counting in a silicon single-electron pump
Tuomo Tanttu, Alessandro Rossi, Kuan Yen Tan +4
We report electron counting experiments in a silicon metal-oxide-semiconductor quantum dot architecture which has been previously demonstrated to generate a quantized current in ex…