71 citations · 167 across the 6 of their papers we have counts for
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cond-mat.str-el2021★ 35 cited
Designing flat-band tight-binding models with tunable multifold band touching points
Ansgar Graf, Frédéric Piéchon
Being dispersionless, flat bands on periodic lattices are solely characterized by their macroscopically degenerate eigenstates: compact localized states (CLSs) in real space and Bl…
physics.atom-ph2021★ 9 cited
An ultralow-noise superconducting radio-frequency ion trap for frequency metrology with highly charged ions
J. Stark, C. Warnecke, S. Bogen +17
We present a novel ultrastable superconducting radio-frequency (RF) ion trap realized as a combination of an RF cavity and a linear Paul trap. Its RF quadrupole mode at 34.52 MHz r…
cond-mat.other2021★ 71 cited
Berry Curvature and Quantum Metric in -band systems -- an Eigenprojector Approach
Ansgar Graf, Frédéric Piéchon
The eigenvalues of a parameter-dependent Hamiltonian matrix form a band structure in parameter space. In such -band systems, the quantum geometric tensor (QGT), consisting of th…