291 citations · 601 across the 8 of their papers we have counts for
8 papers
Sub-kelvin temperature management in ion traps for optical clocks
T. Nordmann, A. Didier, M. Doležal +3
The uncertainty of the ac Stark shift due to thermal radiation represents a major contribution to the systematic uncertainty budget of state-of-the-art optical atomic clocks. In th…
Controlling systematic frequency uncertainties at the level in linear Coulomb crystals
J. Keller, T. Burgermeister, D. Kalincev +5
Trapped ions are ideally suited for precision spectroscopy, as is evident from the remarkably low systematic uncertainties of single-ion clocks. The major weakness of these clocks…
Probing Time Dilation in Coulomb Crystals in a high-precision Ion Trap
J. Keller, D. Kalincev, T. Burgermeister +5
Trapped-ion optical clocks are capable of achieving systematic fractional frequency uncertainties of and possibly below. However, the stability of current ion clocks is…
Evaluation of trap-induced systematic frequency shifts for a multi-ion optical clock at the level
J. Keller, T. Burgermeister, D. Kalincev +2
In order to improve the short-term stability of trapped-ion optical clocks, we are developing a frequency standard based on In / Yb Coulomb crystals…
Precise determination of micromotion for trapped-ion optical clocks
J. Keller, H. L. Partner, T. Burgermeister +1
As relative systematic frequency uncertainties in trapped-ion spectroscopy are approaching the low range, motional frequency shifts account for a considerable fraction o…
Structural phase transitions and topological defects in ion Coulomb crystals
Heather L. Partner, Ramil Nigmatullin, Tobias Burgermeister +7
We use laser-cooled ion Coulomb crystals in the well-controlled environment of a harmonic radiofrequency ion trap to investigate phase transitions and defect formation. Topological…
Dynamics of topological defects in ion Coulomb crystals
Heather L. Partner, Ramil Nigmatullin, Tobias Burgermeister +5
We study experimentally and theoretically the properties of structural defects (kink solitons) in two-dimensional ion Coulomb crystals. We show how different types of kink solitons…
Symmetry Breaking and Topological Defect Formation in Ion Coulomb Crystals
Karsten Pyka, Jonas Keller, Heather L. Partner +9
Symmetry breaking phase transitions play an important role in nature. When a system traverses such a transition at a finite rate, its causally disconnected regions choose the new b…