A5082786477- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Quantum Information and Cryptography
- Strong Light-Matter Interactions
- Molecular Junctions and Nanostructures
- Mechanical and Optical Resonators
- Optical properties and cooling technologies in crystalline materials
- Quantum optics and atomic interactions
- Spectroscopy and Laser Applications
- Quantum and electron transport phenomena
- Advanced Fiber Laser Technologies
- Atomic and Molecular Physics
- Electron Spin Resonance Studies
- Various Chemistry Research Topics
- Molecular spectroscopy and chirality
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Carbon Nanotubes in Composites
- Force Microscopy Techniques and Applications
- Thermal Radiation and Cooling Technologies
- Laser Design and Applications
- Quantum Electrodynamics and Casimir Effect
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
University of Colorado Boulder
2019-2023
National Institute of Standards and Technology
2019-2023
Joint Institute for Laboratory Astrophysics
2019-2021
MIT-Harvard Center for Ultracold Atoms
2016-2017
Harvard University
2016-2017
Massachusetts Institute of Technology
2015
Harvard University Press
2015
It has long been expected that quantum degenerate gases of molecules would open access to a wide range phenomena in molecular and sciences. However, the very complexity makes ultracold so enticing made reaching degeneracy an outstanding experimental challenge over past decade. We now report production Fermi gas polar potassium--rubidium (KRb). Through coherent adiabatic association deeply mixture rubidium Bose-Einstein condensate potassium gas, we produce at temperatures below 0.3 times...
We perform magnetically assisted Sisyphus laser cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in rotationally closed P(N′′=1) branch either X˜2Σ+(000)↔A˜2Π1/2(000) or X˜2Σ+(000)↔B˜2Σ+(000) vibronic transitions. Molecules lost into excited vibrational states during process are repumped back through B˜(000) state for both (100) level Sr-O stretching mode and (0200) bending mode. The transverse temperature a SrOH molecular...
An experimentally feasible strategy for direct laser cooling of polyatomic molecules with six or more atoms is presented. Our approach relies on the attachment a metal atom to complex molecule, where it acts as an active photon cycling site. We describe scheme alkaline earth monoalkoxide free radicals taking advantage phase space compression cryogenic buffer-gas beam. Possible applications are presented including chiral and slowing molecular beams using coherent processes.
Microscopic control over polar molecules with tunable interactions would enable realization of novel quantum phenomena. Using an applied electric field gradient, we demonstrate layer-resolved state preparation and imaging ultracold potassium-rubidium confined to two-dimensional planes in optical lattice. The coherence time rotational superpositions individual layers is maximized by rotating the relative trap polarization achieve state-insensitive trapping. Molecules adjacent interact via...
We study a bulk fermionic dipolar molecular gas in the quantum degenerate regime confined two-dimensional geometry. consider two rotational states that encode spin 1/2 degree of freedom. derive long-range interacting XXZ model describing many-body dynamics molecules valid where motional degrees freedom are frozen. Due to spatially extended nature harmonic oscillator modes, interactions very long-ranged and system behaves close collective limit, resulting robust generation entanglement form...
Full control of molecular interactions, including reactive losses, would open new frontiers in quantum science. We demonstrate extreme tunability ultracold chemical reaction rates by inducing resonant dipolar interactions means an external electric field. prepared fermionic potassium-rubidium molecules their first excited rotational state and observed a modulation the rate three orders magnitude as we tuned field strength few percent across resonance. In quasi-two-dimensional geometry,...
Vibrational relaxation of strontium monohydroxide (SrOH) molecules in collisions with helium (He) at 2 K is studied. We find the diffusion cross section SrOH 2.2 to be and vibrational quenching for (100) Sr–O stretching mode . The resulting ratio more than an order magnitude smaller previously studied few-atom radicals (Au et al 2014 Phys. Rev. A 90 032703 ). also determine Franck–Condon factor ()
We observe thermalization in the production of a degenerate Fermi gas polar ^{40}K^{87}Rb molecules. By measuring atom-dimer elastic scattering cross section near Feshbach resonance, we show that molecules rapidly reach thermal equilibrium with both parent atomic species. Equilibrium is essentially maintained through coherent transfer to ground state. Sub-Poissonian density fluctuations and ground-state are measured, giving an independent characterization degeneracy directly probing...
We demonstrate multiple photon cycling and radiative force deflection on the triatomic free radical strontium monohydroxide (SrOH). Optical is achieved SrOH in a cryogenic buffer-gas beam by employing rotationally closed branch of vibronic transition . A single repumping laser excites Sr–O stretching vibrational mode, molecule deflects an angle via scattering ∼100 photons per molecule. This approach can be used for direct cooling more complex, isoelectronic species.
We design dipolar quantum many-body Hamiltonians that will facilitate the realization of exotic phases under current experimental conditions achieved for polar molecules. The main idea is to modulate both single-body potential barriers and two-body interactions on a spatial scale tens nanometers strongly enhance energy scales and, therefore, relax temperature requirements observing new engineered systems. consider compare two approaches. In first, nanoscale are generated with standing-wave...
Strongly interacting spins underlie many intriguing phenomena and applications ranging from magnetism to quantum information processing. Interacting combined with motion display exotic spin transport phenomena, such as superfluidity arising pairing of induced by attraction. To understand these complex an system high controllability is desired. Quantum dynamics have been studied on different platforms varying capabilities. Here we demonstrate tunable itinerant enabled dipolar interactions...