Magnetic trapping of atomic chromium

Abstract

Ground-state 52 Cr atoms have been magnetically trapped using buffer-gas loading. The atoms are produced by laser ablation of solid 52 Cr, thermalized by collisions with a cryogenically cooled helium buffer gas, and trapped by an anti-Helmholtz quadrupole magnetic field. The atoms are detected by absorption spectroscopy on the a 7 S 3 ↔z 7 P 3 transition at 427.6 nm. Using this technique, approximately 10 11 atoms are loaded into the trap in a single ablation pulse. Loading has been demonstrated at temperatures from 0.3 to 1.4 K.

Roton-Maxon Spectrum and Stability of Trapped Dipolar Bose-Einstein Condensates

“…This makes the properties of such dipolar gases drastically different from the properties of commonly studied atomic cold gases, where the interparticle interaction is short-range. Other candidates to form a dipolar gas are atoms with large magnetic moments [3,4], and atoms with dc-field-[5] or lightinduced electric dipole moments [6,7,8].The dipole-dipole interaction is responsible for a variety of novel phenomena in ultracold dipolar systems. The energy independence of the dipole-dipole scattering amplitude for any orbital angular momenta provides realistic possibilities for achieving a superfluid BCS transition in single-component dipolar Fermi gases (see [9] and refs.…”

“…This makes the properties of such dipolar gases drastically different from the properties of commonly studied atomic cold gases, where the interparticle interaction is short-range. Other candidates to form a dipolar gas are atoms with large magnetic moments [3,4], and atoms with dc-field-[5] or lightinduced electric dipole moments [6,7,8].…”

Ferromagnetic phase transition and Bose-Einstein condensation in spinor Bose gases

“…But since the realization of Bose-Einstein condensation (BEC) in ultracold atomic gases [2], more and more attention has been attracted to this topic, because the constituent atoms, such as 87 Rb, 23 Na, and 7 Li usually have (hyperfine) spin degrees of freedom and thus a magnetic moment m. m can be large in atoms such as 52 Cr [3], for which m = 6µ B , where µ B is the Bohr magneton. Since 1998, atomic gases can be confined and cooled in purely optical traps in which their spin degrees of freedom remain active, and therefore investigating their magnetic properties becomes experimentally possible [4].…”

Mixtures of ultracold gases: Fermi sea and Bose-Einstein condensate of lithium isotopes

“…This could be an interesting cooling scheme for quantum computation or optical clocks, since it leaves the internal state of the Q-bits or clock ions untouched but cools them all the same. Neutral atoms and molecules such as europium, chromium, and lead monoxide have been cooled sympathetically by thermal contact due to collisions with a cryogenically cooled Helium buffer gas [54,55,56]. Sympathetic cooling in combination with evaporative cooling was first demonstrated…”

“…It was often used for cooling ions confined in electromagnetic traps [52,53]. Neutral atoms and molecules have been cooled via cryogenically cooled Helium [54,55,56]. Sympathetic cooling using 87 Rb atoms in two different internal states has led to the production of two overlapping condensates [57,58,59].…”