Ultracold sodium molecules were produced from an atomic Bose-Einstein condensate by ramping applied magnetic field across a Feshbach resonance. More than ${10}^{5}$ generated with conversion efficiency of $\ensuremath{\sim}4%$. Using laser light resonant transition, the remaining atoms could be selectively removed, preventing fast collisional relaxation molecules. Time-of-flight analysis pure molecular sample yielded instantaneous phase-space density greater 20.

We observe coherent resonant coupling of optical whispering-gallery modes in fluorescence from dye doped polymer bispheres with diameters ranging 2 to $5\ensuremath{\mu}\mathrm{m}$. By monitoring the frequencies peaks individual spheres, we sort out two spheres appropriate size matching and bring them into contact. Wave optics calculation also gives good agreement experiment. taking account harmonic modes, obtained features normal mode splitting are well explained by tight-binding photon picture.

Thermodynamic properties of matter generally depend on the details interactions between its constituent parts. However, in a unitary Fermi gas where scattering length diverges, thermodynamics is determined through universal functions that only particle density and temperature. By using general form equation state force balance, we measured local internal energy trapped as function these parameters. Other functions, such those corresponding to Helmholtz free energy, chemical potential,...

The binding energy of an Efimov trimer state was precisely determined via radio-frequency association. It is found that the measurement results shift significantly with temperature, but becomes negligible at lowest temperature in our experiment. shift-free part reveals a significant deviation from nonuniversal theory prediction based on three-body parameter monotonic binding-energy dependence.

The dissociation of ultracold molecules is studied by ramping an external magnetic field through a Feshbach resonance. observed energy shows non-linear dependence on the ramp speed and directly yields strength atom-molecule coupling. In addition, inelastic molecule-molecule molecule-atom collisions are characterized.

We propose and demonstrate a "bottom-up" approach to constructing photonic structures for photon manipulation. Supermonodispersive polymer microspheres are used as building blocks size uniformity better than 0.05% could be obtained by sorting the spheres using spectroscopic methods. The positioned in V groove on silicon substrate form chain with resonant coupling of optical whispering-gallery modes. Photonic band modes clearly observed fluorescence scattering spectra, an excellent agreement...

We observed an enhanced atom-dimer relaxation due to the existence of Efimov states in a three-component mixture 6Li atoms. measured magnetic-field dependence loss coefficient atoms state |1> and dimers formed |2> |3>, found two peaks corresponding degeneracy points |23> dimer energy level levels trimers. that locations these disagree with universal theory predictions, way cannot be explained by non-universal two-body properties. constructed theoretical models characterize three-body physics...

We have observed $p$-wave Feshbach molecules for all three combinations of the two lowest hyperfine spin states $^{6}\mathrm{Li}$. By creating a pure molecular sample in an optical trap, we measured inelastic collision rates molecules. also elastic rate from thermalization breathing mode which was excited spontaneously upon formation.

A dynamic magneto-optical trap, which relies on the rapid randomization of population in Zeeman substates, has been demonstrated for fermionic strontium atoms 1S0-3P1 intercombination transition. The obtained sample, 1x10(6) at a temperature 2 microK was further Doppler cooled and polarized far-off resonant optical lattice to achieve times Fermi temperature.

We report the experimental determination of scattering parameters for a $p$-wave Feshbach resonance in single-component Fermi gas ${}^{6}$Li atoms lowest spin state. The time scale cross-dimensional relaxation reflects elastic-scattering rate atoms, and are determined from as function magnetic field by taking into account momentum distribution inhomogeneous density profile trap. Precise is an important step toward realization superfluid ultracold atomic gas.

Propagation and interference of quantum-mechanical particles comprise an important part elementary processes in quantum physics, their essence can be modeled using a walk, mathematical concept that describes the motion particle among discretized spatial regions. Here we report observation walks phonon, vibrational quantum, trapped-ion crystal. By employing capability preparing observing localized wave packet propagation single radial local phonon four-ion linear crystal is observed with...

Lasing at resonantly coupled whispering-gallery mode frequencies is observed in photonic molecules consisting of bispheres 4.2 and 5.1 microm diameter placed a silicon V-groove. We examine spatial profiles molecule modes by use frequency-resolved imaging reveal bonding antibonding features. From the lasing threshold characteristics, we quantitatively measure quality factor spontaneous-emission coupling ratio confirm that strong coherent leads to modes.

Charge-exchange collisions between ultracold fermionic $^{6}\mathrm{Li}$ atoms and $^{40}\mathrm{Ca}^{+}$ ions are observed in the millikelvin temperature range. The reaction product of charge-exchange collision is identified via mass spectrometry during which motion excited parametrically. cross sections ground state metastable states determined. Investigation inelastic characteristics atom-ion mixture an important step toward chemistry based on ions.

We investigate the energy dependence and internal-state of charge-exchange collision cross sections in a mixture $^6$Li atoms $^{40}$Ca$^+$ ions range from 0.2 mK to 1 K. Deliberately excited ion micromotion is used control ions. The section obeys Langevin model temperature current experiment, measured magnitude correlated internal state Revealing relationship between interaction potentials an important step toward realization full quantum chemical reactions at ultralow regime.

We observed elastic collisions between laser-cooled fermionic lithium atoms and calcium ions at the energy range from 100 mK to 3 K. Lithium in an optical-dipole trap were transported center of ion using optical-tweezer technique, a spatial overlap was realized order observe atom-ion interactions. The elastic-scattering rate determined decay due with ions. collision-energy dependence cross section consistent semiclassical collision theory.

The phase transition from a superfluid to Mott insulator has been observed in $^{23}\mathrm{Na}$ Bose-Einstein condensate. A dye laser detuned $\ensuremath{\approx}5\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ red of the Na $3^{2}S\ensuremath{\rightarrow}3^{2}P_{1∕2}$ was used form three-dimensional optical lattice. heating effects small detuning as well three-body decay processes constrained time scale experiment. Certain lattice detunings were found induce large loss atoms. These features shown...

We report on measurements of the critical temperature and dependence condensate fraction for a fermion pair 6Li atoms. Bragg spectroscopy is employed to determine after fast magnetic field ramp molecular side Feshbach resonance. Our reveal evidence level off limiting behavior near unitarity limit.

We experimentally confirmed the threshold behavior and scattering length scaling law of three-body loss coefficients in an ultracold spin-polarized gas ^{6}Li atoms near a p-wave Feshbach resonance. measured as functions temperature volume, we found that hold limited magnetic field regions. also breakdown laws is due to emergence effective-range term. This work important first step towards full understanding identical fermions with interactions.

We experimentally investigate the unitarity-limited behavior of three-body loss near a p-wave Feshbach resonance in single-component Fermi gas $^6$Li atoms. At unitarity limit, coefficient $L_{3}$ exhibits universality sense that it is independent interaction strength and follows predicted temperature scaling law $L_3 \propto T^{-2}$. When decreasing from regime, as function can be described by theory based on association an excited resonant quasibound state its relaxation into deep stable...

We systematically studied the two-body loss in a two-component Fermi gas of $^{6}\mathrm{Li}$ atoms near $p$-wave Feshbach resonance. The rate constants were measured for various temperatures and magnetic fields using trapped three-dimensional quasi-two-dimensional traps. Our results nicely reproduced by theoretical model that incorporates as an imaginary part to inverse scattering volume amplitude expression. observed suppression traps may provide promising strategy realize superfluid...

We demonstrated sympathetic cooling of a single ion in buffer gas ultracold atoms with small mass. Efficient collisional was realized by suppressing collision-induced heating. attempt to explain the experimental results simple rate equation model and provide quantitative discussion efficiency per collision. The knowledge we obtained this work is an important ingredient for advancing technique ions neutral atoms.

We selectively create p-wave Feshbach molecules in the $m_{l}=\pm 1$ orbital angular momentum projection state of $^{6}$Li. use an optical lattice potential to restrict relative atoms such that only molecular couples at resonance. observe hollow-centered dissociation profile, which is a clear indication selective creation $m_{l}=\pm1$ states. also measure energy created and develop theoretical formulation explain as function magnetic field ramp rate for dissociation. The capability selecting...

We describe the three-body loss coefficient of identical fermions with $p$-wave interactions using a set rate equations in which recombination happens via an indirect process. Our theoretical treatment explains experimental results just above universal scaling law regime weak interactions. Furthermore, we theoretically extend and experimentally verify equation model for case atoms trapped two dimensions. Moreover, find that two-dimensional trap is proportional to $A_{p}^{3}$ weakly...