Takuya Ikemachi

All-optical production of dual Bose–Einstein condensates of paired fermions and bosons with 6Li and 7Li

We report the first all-optical production of a superfluid Bose-Fermi mixture with two spin states of Li (fermion) and one spin state of Li (boson) under the resonant magnetic field of the s-wave Feshbach resonance of the fermions. Fermions are cooled efficiently by evaporative cooling and they serve as coolant for bosons. As a result, a superfluid mixture can be achieved by using a simple experimental apparatus and procedures, as in the case of the all-optical production of a single Bose-Einstein condensate (BEC). We show that the all-optical method enables us to realize variety of ultracold Bose-Fermi mixtures.We report the first all-optical production of dual Bose–Einstein condensates (BECs) of paired 6Li (fermion) and one spin state of 7Li (boson) at the magnetic field where the s-wave interactions between fermions are resonant. Fermions are cooled efficiently by evaporative cooling and they serve as coolant for bosons. As a result, the dual condensates can be achieved by using a simple experimental apparatus and procedures, as in the case of the all-optical production of a single BEC. We show that the all-optical method enables us to realize variety of ultracold Bose–Fermi mixtures.

Appropriate Probe Condition for Absorption Imaging of Ultracold 6Li Atoms

One of the readily accessible observables in trapped cold-atom experiments is the column density, which is determined from optical depth (OD) obtained from absorption imaging and the absorption cross-section (

Extended solid-state three-step model for high-harmonic generation from periodic crystals

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Trajectory analysis of high-order-harmonic generation from periodic crystals

). Here we report on simple and accurate determination of OD for dense gases of light atoms such as lithium-6. We investigate theoretically and experimentally an appropriate condition for the probe intensity and duration to achieve good signal-to-noise ratio by considering the influences of photon recoils and photon shot noises. As a result, we have succeeded in measuring OD which reached 2.5 with a signal-to-noise ratio of 10 under spatial resolution of 1.7

Time-dependent Hartree-Fock study of electron-hole interaction effects on high-order harmonic generation from periodic crystals

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Many-body effects upon high-harmonic generation in solid-state materials

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Solid-state three-step model for high-harmonic generation from periodic crystals

Solid-state materials have recently emerged as a new stage for strong-field physics. Since the first observation of high-harmonic generation (HHG) from solids by Ghimire et al. [1], its mechanism is under intensive discussion.