27 citations · 28 across the 4 of their papers we have counts for
4 papers
Absence of a Superradiant Phase Transition in Dirac Landau Polaritons
Elsa Jöchl, Felix Helmrich, Frieder Lindel +6
One of the most striking predictions in cavity quantum electrodynamics is the condensation of photons into a macroscopically populated ground state, the so-called superradiant phas…
Gate-tunable single terahertz meta-atom ultrastrong light-matter coupling
Elsa Jöchl, Anna-Lydia Vieli, Lucy Hale +6
We study the electrical tunability of ultrastrong light-matter interactions between a single terahertz circuit-based complementary split ring resonator (cSRR) and a two-dimensional…
Cavity-Driven Attractive Interactions in Quantum Materials
F. Helmrich, H. S. Adlong, I. Khanonkin +5
Many-body phenomena in quantum materials emerge from the interplay among a broad continuum of electronic states, and controlling these interactions is critical for engineering nove…
Precision measurement of the ionization energy and quantum defects of 39K I
Michael Peper, Felix Helmrich, Jonas Butscher +4
We present absolute-frequency measurements in ultracold 39K samples of the transitions from the ground state to np Rydberg states. A global nonlinear regression of the np1/2 and np…