Spin-wave damping in ferromagnetic stripes with inhomogeneous magnetization

Molecular cooling via Sisyphus processes

“…Obviously the Sisyphus method is very easy to implement for trapped quasi closed systems [77][78][79][80] and can then be a very impressive complement to standard laser cooling. For trapped species, the photon transition rate can be very slow and the scheme is particularly suitable for particles that require deep-UV lasers for electronic excitations.…”

“…The amount of possible cooling schemes, using optical, magnetic, electric or gravitational forces combined with laser (or Radio-Frequency) transitions of any kind (Raman, coherent, stimulated, pulsed, shaped, multiphotonics, black-body ...) is so large and the method so versatile that it can be implemented to several species including ions [80,81], ranging from simple atoms to polyatomic molecules, that are difficult to laser cool, such as (anti-)hydrogen. It can be generalized to realize continuous cooling in new type of Stark or Zeeman decelerators.…”

Optical pulse-shaping for internal cooling of molecules

“…Electronic transitions are generally much faster than rotational and vibrational transitions; for example, the decay A 2 Π(v = 0) → X 2 Σ + (v = 0) for AlH + occurs with a time constant of 10 −7 s, as compared with the 10 −2 s for X 2 Σ + (v = 1) → X 2 Σ + (v = 0). Unlike for vibrational excitation approaches, extension of our scheme to molecules with arXiv:1104.3177v4 [physics.atom-ph] 17 Oct 2011 larger reduced mass (non-hydrides, e.g., SiO + [13]) is also possible without incurring longer cooling times. The pulsed-shaped rovibrational optical cooling (PROC) scheme proposed in this article uses a PFL to pump the population of diatomic molecular ions (e.g., AlH + ) trapped in a linear Paul trap, to their rovibrational ground state.…”

“…Furthermore, the BBR redistribution method is only efficient for hydride molecules because their rotational spacings are on order of 20 cm −1 (k B ×30 K), which is sufficiently large to still be driven on seconds timescales by the low-energy tail of the 300 K BBR spectrum [12]. For non-hydride molecules such as ClF + , BrCl + , and SiO + , the spacings of rotational states are much smaller, and the BBR redistribution timescales are on order of tens of seconds [12,13].…”

“…In particular, we analyze optical pulse-shaped rotational cooling of AlH + molecular ions held in a radiofrequency Paul trap. Our technique is also readily applicable to other species with diagonal FCFs, such as BH + [19] and SiO + [13].…”