A5084940330- Cold Atom Physics and Bose-Einstein Condensates
- Strong Light-Matter Interactions
- Quantum, superfluid, helium dynamics
- Advanced Frequency and Time Standards
- Physics of Superconductivity and Magnetism
- Atomic and Subatomic Physics Research
- Spectroscopy and Laser Applications
- Quantum optics and atomic interactions
- Atomic and Molecular Physics
- Radioactive Decay and Measurement Techniques
- Quantum many-body systems
- Laser Design and Applications
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Chemical Synthesis and Characterization
- Microfluidic and Capillary Electrophoresis Applications
- Various Chemistry Research Topics
- Photonic and Optical Devices
- Advanced Aircraft Design and Technologies
- Superconductivity in MgB2 and Alloys
- Spectroscopy and Quantum Chemical Studies
- Molecular Junctions and Nanostructures
- Experimental and Theoretical Physics Studies
- Magnetic properties of thin films
- Frequency Control in Power Systems
National Institute for Subatomic Physics
2024
University of Groningen
2024
Munich Center for Quantum Science and Technology
2020-2023
Max Planck Institute of Quantum Optics
2018-2023
Siemens (Germany)
2018-2023
Karlsruhe Institute of Technology
2023
National Academy of Engineering
2023
University of California, Berkeley
2023
Ultracold polar molecules offer strong electric dipole moments and rich internal structure, which makes them ideal building blocks to explore exotic quantum matter
Abstract The interplay of quantum statistics and interactions in atomic Bose–Fermi mixtures leads to a phase diagram markedly different from pure fermionic or bosonic systems. However, investigating this remains challenging when bosons condense due the resulting fast interspecies loss. Here we report observations consistent with transition polaronic molecular density-matched degenerate mixture. condensate fraction, representing order parameter transition, is depleted by interactions,...
Understanding collisions between ultracold molecules is crucial for making stable molecular quantum gases and harnessing their rich internal degrees of freedom engineering. Transient complexes can strongly influence collisional physics, but in the regime, key aspects behavior have remained unknown. To explain experimentally observed loss ground-state from optical dipole traps, it was recently proposed that be lost due to photoexcitation. By trapping a repulsive box potential using laser...
Collisional complexes, which are formed as intermediate states in molecular collisions, typically short-lived and decay within picoseconds. However, ultracold collisions involving bialkali molecules, complexes can live for milliseconds, completely changing the collision dynamics. This lead to unexpected two-body loss samples of nonreactive molecules. During past decade, such "sticky" have been a major hindrance preparation dense stable samples, especially quantum-degenerate regime....
Abstract Scattering resonances are an essential tool for controlling the interactions of ultracold atoms and molecules. However, conventional Feshbach scattering 1 , which have been extensively studied in various platforms 1–7 not expected to exist most polar molecules because fast loss that occurs when two approach at a close distance 8–10 . Here we demonstrate new type resonance is universal wide range The so-called field-linked 11–14 occur microwave-dressed stable macroscopic tetramer...
Superpositions of rotational states in polar molecules induce strong, long-range dipolar interactions. Here we extend the coherence by nearly one order magnitude to 8.7(6) ms a dilute gas $^{23}$Na$^{40}$K an optical trap. We demonstrate spin-decoupled magic trapping, which cancels first-order and reduces second-order differential light shifts. The latter is achieved with dc electric field that decouples nuclear spin, rotation trapping field. observe density-dependent times, can be explained...
We demonstrate a versatile, state-dependent trapping scheme for the ground and first excited rotational states of $^{23}\mathrm{Na}^{40}\mathrm{K}$ molecules. Close to manifold narrow electronic transition, we determine tune-out frequencies where polarizability one state vanishes while other remains finite, magic frequency both experience equal polarizability. The proximity these only 10 GHz allows dynamic switching between different trap configurations in single experiment, still...
We study three-body loss in an ultracold mixture of a thermal Bose gas and degenerate Fermi gas. find that at unitarity, where the interspecies scattering length diverges, usual inverse-square temperature scaling found nondegenerate systems is strongly modified reduced with increasing degeneracy While reduction qualitatively explained within few-body framework, remaining suppression provides evidence for long-range Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions mediated by fermions...
We demonstrate the transfer of $^{23}\mathrm{Na}^{40}\mathrm{K}$ molecules from a closed-channel-dominated Feshbach-molecule state to absolute ground state. The Feshbach are initially created gas sodium and potassium atoms via adiabatic ramping over resonance at 78.3 G. then transferred using stimulated Raman passage with an intermediate in spin-orbit-coupled complex...
Ultracold fermionic Feshbach molecules are promising candidates for exploring quantum matter with strong $p$-wave interactions; however, their lifetimes were measured to be short. Here we characterize the collisions of ultracold $^{23}\mathrm{Na}^{40}\mathrm{K}$ different scattering lengths and temperatures. By increasing binding energy molecules, two-body loss coefficient reduces by three orders magnitude, leading a second-long lifetime 20 times longer than that ground-state NaK molecules....
Abstract An electrostatic hexapole lens is used to manipulate the transverse properties of a beam barium fluoride molecules from cryogenic buffer gas source. The spatial distribution measured by recording state-selective laser-induced fluorescence on an emccd camera, providing insight into intensity and position spread molecular beam. Although high mass unfavorable Stark shift pose considerable challenge, number in low-field seeking component N = 1 state that pass 4 mm diameter aperture 712...
Electric machines with very power-to-weight ratios are inevitable for hybrid electric aircraft applications. One potential technology that is promising to achieve the required ratio short-range aircraft, superconductors used high current densities in stator or magnetic fields rotor. In this paper, we present an indepth analysis of fully and partially superconducting based on analytical approach taking into account all relevant physical domains such as electromagnetics, properties, thermal...
In order to determine the spatial distribution of flexural strength, three-point bend tests have been performed on bar specimens cut from four YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> single-grain bulk superconductors. A relatively large spread room temperature average and standard deviation 49.3 MPa 12.7 MPa,...
GdBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> bulk superconductors are a route to higher magnetic fields in rotating machines. Here, we examine the resistance of pulse-field magnetized bulks demagnetization they may experience such system. The were at 77 K, after which several thousand cycles AC field applied. Subsequently,...
An electrostatic hexapole lens is used to manipulate the transverse properties of a beam barium fluoride molecules from cryogenic buffer gas source. The spatial distribution measured by recording state-selective laser-induced fluorescence on an emccd camera, providing insight into intensity and position spread molecular beam. Although high mass unfavorable Stark shift pose considerable challenge, number in low-field seeking component N=1 state that pass 4 mm diameter aperture 712 behind...
We present the conceptual design of an experiment to measure electron's electric dipole moment (eEDM) using $^{138}$BaOH molecules in optical lattice. The BaOH molecule is laser-coolable and highly sensitive eEDM, making it attractive candidate for such a precision measurement, capturing lattice offers potentially very long coherence times. study possibilities limitations this approach, identify most crucial limiting factors ways overcome them. proposed apparatus can reach statistical error...
The interplay of quantum statistics and interactions in atomic Bose--Fermi mixtures leads to a phase diagram markedly different from pure fermionic or bosonic systems. However, investigating this remains challenging when bosons condense. Here, we observe evidence for transition polaronic molecular density-matched degenerate mixture. condensate fraction, representing the order parameter transition, is depleted by build-up strong correlations results emergence Fermi gas. By driving through...
Ultracold polar molecules offer strong electric dipole moments and rich internal structure, which makes them ideal building blocks to explore exotic quantum matter, implement novel information schemes, or test fundamental symmetries of nature. Realizing their full potential requires cooling interacting molecular gases deeply into the degenerate regime. However, complexity collisions intrinsically unstable at short range, even for nonreactive molecules, has so far prevented degeneracy in...
The use of high-temperature superconductors in electric machines offers potentially large gains performance compared to conventional conductors, but also comes with unique challenges. Here, the electromagnetic properties superconducting bulk HTS trapped-field magnets rotor and copper coils stator are investigated. To this end, an analytical model field radial air-gap synchronous is developed validated, taking into account specific difficulties that occur treatment HTS. Using model, influence...
Ultracold fermionic Feshbach molecules are promising candidates for exploring quantum matter with strong $p$-wave interactions, however, their lifetimes were measured to be short. Here, we characterize the collisions of ultracold $^{23}\mathrm{Na}^{40}\mathrm{K}$ different scattering lengths and temperatures. By increasing binding energy molecules, two-body loss coefficient reduces by three orders magnitude leading a second-long lifetime, 20 times longer than that ground-state molecules. We...
Scattering resonances are an essential tool for controlling interactions of ultracold atoms and molecules. However, conventional Feshbach scattering resonances, which have been extensively studied in various platforms, not expected to exist most polar molecules due the fast loss that occurs when two approach at a close distance. Here, we demonstrate new type is universal wide range The so-called field-linked occur microwave-dressed stable macroscopic tetramer states intermolecular potential....
The Award, which may be presented during the Applied Superconductivity Conference or an alternative applied superconductivity conference associated with Council on Superconductivity, will recognize individuals for contributions in field of over a period time (nominally more than 20 years) based novel and innovative concepts proposed by individual, authorship coauthorship number publications major significance to superconductivity, presentation invited plenary talks at national international...