Trapping Fermionic 40K and Bosonic 87Rb on a Chip

Aubin, S.; Extavour, M.; Myrskog, Stefan; LeBlanc, Lindsay J.; Estève, Jérôme; Singh, Swati; Scrutton, P.; McKay, David; McKenzie, Ross H.; Leroux, Ian D.; Stummer, A.; Thywissen, Joseph H.

doi:10.1007/s10909-005-7322-5

Cited by 33 publications

(40 citation statements)

References 49 publications

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“…K desorption is also reported for Pyrex [6] and Vycor [8]. It is reported that quartz is much less suitable for LIAD than Pyrex [5].…”

Section: A Ultrahigh Vacuum Cellsmentioning

confidence: 84%

“…Several groups have reported LIAD in UHV cells [5][6][7][8]. Although each group performed the experiment in a slightly different way, we summarize here the general properties of LIAD in UHV cells.…”

Section: A Ultrahigh Vacuum Cellsmentioning

confidence: 99%

“…Although the absolute number of trapped atoms depends on the configuration of the laser trapping system, this number is raised by two orders of magnitude to 10 9 atoms with the LIAD light (blue LEDs of 140 mW, 3.1 eV) on [6], indicating that the atomic density in the gas phase increases by a similar order. The number of trapped atoms increases with increasing photon energy in the range of 1.6 eV to 4.9 eV [8].…”

Section: A Ultrahigh Vacuum Cellsmentioning

confidence: 99%

“…The typical cell pressure * Corresponding author: hatakeya@phys.c.u-tokyo.ac.jp is 10 −8 Pa, which is much lower than alkali vapor pressures at room temperature (10 −5 Pa (10 9 atoms/cm 3 ) for Rb). LIAD of K and Rb from borosilicate glass (Pyrex and Vycor) surfaces has been observed in these cells by irradiation of ultraviolet (UV) photons [4][5][6][7][8]. This phenomenon is useful especially for experiments generating Bose-Einstein condensations (BECs), which require seemingly contradicting conditions of both large numbers of trapped atoms (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments

Hatakeyama

Wilde

Fukutani

2006

e-J. Surf. Sci. Nanotechnol.

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We attempt to provide physical interpretations of light-induced desorption phenomena that have recently been observed for alkali atoms on glass surfaces of alkali vapor cells used in atomic physics experiments. We find that the observed desorption phenomena are closely related to recent studies in surface science, and can probably be understood in the context of these results. If classified in terms of the photon-energy dependence, the coverage and the bonding state of the alkali adsorbates, the phenomena fall into two categories: It appears very likely that the neutralization of isolated ionic adsorbates by photo-excited electron transfer from the substrate is the origin of the desorption induced by ultraviolet light in ultrahigh vacuum cells. The desorption observed in low temperature cells, on the other hand, which is resonantly dependent on photon energy in the visible light range, is quite similar to light-induced desorption stimulated by localized electronic excitation on metallic aggregates. More detailed studies of light-induced desorption events from surfaces well characterized with respect to alkali coverage-dependent ionicity and aggregate morphology appear highly desirable for the development of more efficient alkali atom sources suitable to improve a variety of atomic physics experiments.

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“…K desorption is also reported for Pyrex [6] and Vycor [8]. It is reported that quartz is much less suitable for LIAD than Pyrex [5].…”

Section: A Ultrahigh Vacuum Cellsmentioning

confidence: 84%

Section: A Ultrahigh Vacuum Cellsmentioning

confidence: 99%

Section: A Ultrahigh Vacuum Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments

Hatakeyama

Wilde

Fukutani

2006

e-J. Surf. Sci. Nanotechnol.

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“…Furthermore, the creation of fermionic ground state molecules starting from a degenerate Bose-Fermi mixture opens up a whole new avenue of research, as this results in a Fermi gas with long-range, anisotropic dipole-dipole interactions [12]. Since the first degenerate Bose-Fermi mixture of different atomic species, 23 Na and 6 Li [13], a variety of such systems has been realized [8,[14][15][16][17][18][19][20][21][22][23]. However, so far only one mixture, 87 Rb-40 K, has allowed tunability of interspecies interactions with relative ease by means of a moderately wide (∆B ≈ 3 G) Feshbach resonance [24], and only in this case fermionic Feshbach molecules have successfully been produced [25,26].…”

mentioning

confidence: 99%

Quantum degenerate Bose-Fermi mixture of chemically different atomic species with widely tunable interactions

et al. 2012

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Ultracold quantum gases realize paradigms of condensed matter physics in pristine fashion, such as the superfluid to Mott insulator transition [1], the BEC-BCS crossover in fermionic superfluids [2,3] and the Berezinskii-Kosterlitz-Thouless transition in twodimensional Bose gases [4]. A plethora of novel manybody systems may become accessible through the advent of quantum mixtures of different atomic species. In particular, Bose-Fermi mixtures with widely tunable interactions should reveal boson mediated interactions between fermions and possibly boson induced p-wave superfluidity [5,6]. The fate of impurities in a Fermi sea [7] or a Bose condensate [8][9][10] can be studied, and new quantum phases of matter are predicted in optical lattices [11]. Furthermore, the creation of fermionic ground state molecules starting from a degenerate Bose-Fermi mixture opens up a whole new avenue of research, as this results in a Fermi gas with long-range, anisotropic dipole-dipole interactions [12]. Since the first degenerate Bose-Fermi mixture of different atomic species, 23 Na and 6 Li [13], a variety of such systems has been realized [8,[14][15][16][17][18][19][20][21][22][23]. However, so far only one mixture, 87 Rb-40 K, has allowed tunability of interspecies interactions with relative ease by means of a moderately wide (∆B ≈ 3 G) Feshbach resonance [24], and only in this case fermionic Feshbach molecules have successfully been produced [25,26].In this article, we report on the experimental realization of a new Bose-Fermi mixture of 23 Na and 40 K and the observation of over 30 s-and p-wave Feshbach resonances at low magnetic fields. We demonstrate that 23 Na is an efficient coolant for sympathetic cooling of 40 K. A pattern of wide s-wave resonances exists for most of the energetically stable hyperfine combinations, the widest being located at 138 G with a width of about 30 G in the 23 Na|F = 1, m F = 1 + 40 K|F = 9/2, m F = −5/2 hyperfine configuration. We also observe p-wave multiplet resonances that are resolved thanks to their location at low magnetic fields.In the singlet rovibrational ground state, the NaK molecule is known to have a large permanent electric dipole moment of 2.72(6) D [27,28], five times larger than that of KRb [12], and is predicted to be chemically stable against atom-atom exchange reactions [29], in contrast to KRb [30]. An ultracold gas of fermionic ground state molecules of NaK will thus be an ideal system for the study of Fermi gases with strong, long-range dipolar interactions. Indeed, the interaction energy here can be

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Fermions on Atom Chips

et al. 2011

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Theory of ideal Fermi gases 2 2.1 Thermodynamics 3 2.2 Density distribution 5 2.3 Crossover to Fermi degeneracy 7 3 The atom chip 8 3.1 Chip construction and wire pattern 8 3.2 Electrical and mechanical connections 9 3.3 The Z-wire magnetic trap 9 4 Loading the microtrap 10 4.1 Laser cooling and magnetic transport to the chip 10 4.2 Loading bosons and fermions onto the atom chip 11 4.3 Effective trap volume 12 4.4 A full tank of atoms: maximum trapped atom number 13 4.5 Effect of geometry on loaded atom number 14 5 Rapid sympathetic cooling of a K-Rb mixture 15 5.1 Forced sympathetic RF evaporation 15 5.2 K-Rb cross-thermalization 15 5.3 Density-dependent loss 17 5.4 Required temperature 18 5.5 Experimental signatures of Fermi degeneracy 19 6 Species-selective RF manipulation 20 6.1 Sympathetic RF evaporation 20 6.2 Species-selective double wells 23 7 Fermions in an optical dipole trap near an atom chip 26 7.1 Optical trap setup 26 ii Contents 7.2 Loading the optical trap 26 7.3 Microwave and RF manipulation 27 8 Discussion and future outlook 28 Bibliography 30

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Trapping Fermionic 40K and Bosonic 87Rb on a Chip

Cited by 33 publications

References 49 publications

Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments

Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments

Quantum degenerate Bose-Fermi mixture of chemically different atomic species with widely tunable interactions

Fermions on Atom Chips

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