161 citations · 800 across the 15 of their papers we have counts for
15 papers
Building Better Activation Oracles
Jan Bauer, Celeste De Schamphelaere, Adam Karvonen +2
Activation Oracles (AOs) are promising methods for interpreting residual stream activations. However, current AOs face important issues, such as hallucinations and vagueness. Addit…
Universal Response and Emergence of Induction in LLMs
Niclas Luick
While induction is considered a key mechanism for in-context learning in LLMs, understanding its precise circuit decomposition beyond toy models remains elusive. Here, we study the…
Comparing fermionic superfluids in two and three dimensions
Lennart Sobirey, Hauke Biss, Niclas Luick +3
Understanding the origins of unconventional superconductivity has been a major focus of condensed matter physics for many decades. While many questions remain unanswered, experimen…
Excitation Spectrum and Superfluid Gap of an Ultracold Fermi Gas
Hauke Biss, Lennart Sobirey, Niclas Luick +5
Ultracold atomic gases are a powerful tool to experimentally study strongly correlated quantum many-body systems. In particular, ultracold Fermi gases with tunable interactions hav…
Observation of superfluidity in a strongly correlated two-dimensional Fermi gas
Lennart Sobirey, Niclas Luick, Markus Bohlen +3
Understanding how strongly correlated two-dimensional (2D) systems can give rise to unconventional superconductivity with high critical temperatures is one of the major unsolved pr…
Sound propagation and quantum limited damping in a two-dimensional Fermi gas
Markus Bohlen, Lennart Sobirey, Niclas Luick +4
Strongly interacting two-dimensional Fermi systems are one of the great remaining challenges in many-body physics due to the interplay of strong local correlations and enhanced lon…
Josephson junction dynamics in a two-dimensional ultracold Bose gas
Vijay Pal Singh, Niclas Luick, Lennart Sobirey +1
We investigate the Berezinskii-Kosterlitz-Thouless (BKT) scaling of the critical current of Josephson junction dynamics across a barrier potential in a two-dimensional (2D) Bose ga…
An ideal Josephson junction in an ultracold two-dimensional Fermi gas
Niclas Luick, Lennart Sobirey, Markus Bohlen +4
The role of reduced dimensionality in high temperature superconductors is still under debate. Recently, ultracold atoms have emerged as an ideal model system to study such strongly…
Detecting Friedel oscillations in ultracold Fermi gases
Keno Riechers, Klaus Hueck, Niclas Luick +2
Investigating Friedel oscillations in ultracold gases would complement the studies performed on solid state samples with scanning-tunneling microscopes. In atomic quantum gases int…
Two-Dimensional Homogeneous Fermi Gases
Klaus Hueck, Niclas Luick, Lennart Sobirey +3
We report on the experimental realization of homogeneous two-dimensional (2D) Fermi gases trapped in a box potential. In contrast to harmonically trapped gases, these homogeneous 2…
Calibrating High Intensity Absorption Imaging of Ultracold Atoms
Klaus Hueck, Niclas Luick, Lennart Sobirey +5
Absorption imaging of ultracold atoms is the foundation for quantitative extraction of information from experiments with ultracold atoms. Due to the limited exposure time available…
Suppression of kHz-Frequency Switching Noise in Digital Micro-Mirror Devices
Klaus Hueck, Anton Mazurenko, Niclas Luick +2
High resolution digital micro-mirror devices (DMD) make it possible to produce nearly arbitrary light fields with high accuracy, reproducibility and low optical aberrations. Howeve…
Probing superfluidity of Bose-Einstein condensates via laser stirring
Vijay Pal Singh, Wolf Weimer, Kai Morgener +5
We investigate the superfluid behavior of a Bose-Einstein condensate of Li molecules. In the experiment by Weimer et al., Phys. Rev. Lett. 114, 095301 (2015) a condensate is st…
Rapid production of uniformly-filled arrays of neutral atoms
Brian J. Lester, Niclas Luick, Adam M. Kaufman +2
We demonstrate rapid loading of a small array of optical tweezers with a single Rb atom per site. We find that loading efficiencies of up to 90% per tweezer are achievable i…
The critical velocity in the BEC-BCS crossover
Wolf Weimer, Kai Morgener, Vijay Pal Singh +5
We map out the critical velocity in the crossover from Bose-Einstein condensation (BEC) to Bardeen-Cooper-Schrieffer superfluidity with ultracold Li gases. A small attractive…