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High-intensity two-frequency photoassociation spectroscopy of a weakly bound molecular state
Published 2019“…The proposed scheme is advantageous over typical optical Feshbach resonance in tuning scattering length due to its lower atom loss rate. …”
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Final Year Project (FYP) -
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Elliptic flow in a strongly interacting normal Bose gas
Published 2018“…We study the anisotropic, elliptic expansion of a thermal atomic Bose gas released from an anisotropic trapping potential, for a wide range of interaction strengths across a Feshbach resonance. We show that this hydrodynamic phenomenon is for all interaction strengths fully described by a microscopic kinetic model with no free parameters. …”
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Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
Published 2010“…We determine the polaron energy and the quasiparticle residue for various interaction strengths around a Feshbach resonance. At a critical interaction, we observe the transition from polaronic to molecular binding. …”
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Scattering in Mixed Dimensions with Ultracold Gases
Published 2010“…By applying an external magnetic field in proximity of a Feshbach resonance, we adjust the free-space scattering length to observe a series of resonances in mixed dimensions. …”
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Time-Resolved Observation of Competing Attractive and Repulsive Short-Range Correlations in Strongly Interacting Fermi Gases
Published 2021“…We exploit a time-resolved pump-probe spectroscopic technique to study the out-of-equilibrium dynamics of an ultracold two-component Fermi gas, selectively quenched to strong repulsion along the upper branch of a broad Feshbach resonance. For critical interactions, we find the rapid growth of short-range anticorrelations between repulsive fermions to initially overcome concurrent pairing processes. …”
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Control of reactive collisions by quantum interference
Published 2022“…By controlling the phase of the scattering wave function via a Feshbach resonance, we modified the loss rate by more than a factor of 100, from far below to far above the universal limit. …”
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Singlet pathway to the ground state of ultracold polar molecules
Published 2020“…We start from a molecular state which contains a significant admixture from the singlet ground state potential by selecting the Feshbach resonance for molecule association. With the only contributing singlet state to the molecular state being fully stretched and with control over the lasers polarization we address a sole hyperfine component of the excited A1Σ+ potential without resolving its hyperfine structure. …”
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Conference Paper -
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Charge transfer excitations, pair density waves, and superconductivity in moiré materials
Published 2022“…When the bandwidth becomes comparable to the pair binding energy, itinerant holes and charge-2e trimers interact resonantly, leading to unconventional superconductivity similar to superfluidity in an ultracold Fermi gas near Feshbach resonance. Our theory is broadly applicable to strongly interacting charge-transfer insulators, such as WSe2/WS2 or TMD homobilayers under an applied electric field.…”
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Pairing instabilities in quasi-two-dimensional Fermi gases
Published 2012“…We employ our formalism to study the formation of molecules in quasi-two-dimensional Fermi gases near Feshbach resonance and show that the rate at which molecules form depends strongly on the transverse confinement. …”
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Correlations and Pair Formation in a Repulsively Interacting Fermi Gas
Published 2012“…A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for an arbitrarily large scattering length. …”
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Ultracold Fermionic Feshbach Molecules of [superscript 23]Na[superscript 40]K
Published 2012“…The lifetime of the nearly degenerate molecular gas exceeds 100 ms in the vicinity of the Feshbach resonance. The measured dependence of the molecular binding energy on the magnetic field demonstrates the open-channel character of the molecules over a wide field range and implies significant singlet admixture. …”
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Pauli paramagnetism of an ideal Fermi gas
Published 2014“…The method is illustrated for a noninteracting gas of [superscript 6]Li, using the tunability of interactions around a wide Feshbach resonance. The susceptibility versus effective magnetic field is directly obtained from the inhomogeneous density profile of the trapped atomic cloud. …”
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Long-Lived Ultracold Molecules with Electric and Magnetic Dipole Moments
Published 2018“…Using magnetoassociation across a narrow Feshbach resonance followed by a two-photon stimulated Raman adiabatic passage to the triplet ground state, we produce 3×10⁴ ground state molecules in a spin-polarized state. …”
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Article -
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Quasi-particle Breakdown and Heat Transport in a Homogeneous Strongly-interacting Fermi Gas
Published 2022“…This thesis describes experiments on a homogeneous strongly-interacting Fermi gas, consisting of a spin mixture of ⁶Li atoms with interactions induced by a Feshbach resonance. The tunability and universality of this atomic gas make it an ideal platform to study many-body physics of interacting Fermi systems. …”
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Thesis