Cavity-Mediated Molecular Cooling

2 Cold Quantum Matter LASER COOLING absorption velocity-dependent emission bathe atoms in red-detuned light Doppler shift ensures impulse opposes motion spontaneous emission returns atoms to initial state ground-state manifolds render repumping lossy …but with molecules:

Cavity-Mediated Molecular Cooling 3 Cavity-mediated cooling DIPOLE FORCE non-resonant interaction needs no spontaneous emission …but is a conservative force CAVITY-MEDIATED COOLING couple atoms/molecules to resonant cavity cavity losses provide dissipation retarded optically-mediated back-action

Cavity-Mediated Molecular Cooling 4 Fundamentals of cavity-mediated cooling J. Eschner et al., Nature (2001) M. A. Wilson et al., Phys. Rev. Lett (2003) trapped ion imaged back onto itself measured level shift ~150kHz equivalent trap depth ~10μK electrostatic dipole interaction with image sign depends upon phase of reflected light ie distance from mirror

Cavity-Mediated Molecular Cooling 5 Early work… P Münstermann et al., Phys Rev Lett (1999) P Maunz et al., Nature (2004) first experimental evidence: P Horak et al, Phys Rev Lett (1997) V Vuletić and S Chu, Phys Rev Lett (2000) theoretical proposals and analysis:

Cavity-Mediated Molecular Cooling 6 Enhancements PWH Pinkse et al., Nature (2000) T Fischer et al., Phys Rev Lett (2002) P Bushev et al., Phys Rev Lett (2006) active feedback: collective enhancement: H W Chan et al., Phys Rev Lett (2003) A T Black et al., Phys Rev Lett (2003) A Beige et al., New J Phys 7 96 (2005) transverse pumping: P Domokos et al., Phys Rev A (2002) S Zippilli et al., Eur Phys J D (2004) S Zippilli et al., Phys Rev Lett (2004)

Cavity-Mediated Molecular Cooling 7 Related phenomena P Horak et al., Phys Rev A (1998) speckle field cooling: optical binding: N. K. Metzger et al., Opt. Expr (2006) mirror-mediated cooling: J B Pendry, J Phys Cond Matt (1997) optical friction:

Cavity-Mediated Molecular Cooling 8 Questions to be addressed MOLECULAR PHYSICS which species are spectroscopically accessible? which species can be pre-cooled (buffer gas, sympathetic, electrostatic/optical deceleration) to form sufficiently cold, dense samples for collective cooling? what performance is possible with real molecular dynamics and excitations? CAVITY COOLING how is the process affected by cavity geometry? how are axial and radial motions cooled/coupled in degenerate multimode cavities or near-field resonant mirrors? what enhancements are possible with active feedback, intracavity gain, nonlinear absorption? how does cooling scale with sample size? what is the role of collective excitations (phonons), coupling to internal excitations? how does cavity-mediated cooling apply to quantum degenerate gases? DYNAMICS

Cavity-Mediated Molecular Cooling 9 CMMC partners University of Århus Michael Drewsen University of Innsbruck Helmut Ritsch ICFO, Barcelona Jürgen Eschner University of Leeds Almut Beige LMU, München Regina de Vivie-Riedle MPQ, Garching Gerhard Rempe Pepijn Pinkse University of Southampton Tim Freegarde Peter Horak University of Barcelona Giovanna Morigi SZFKI, Budapest Peter Domokos Harvard University Tommaso Calarco

Cavity-Mediated Molecular Cooling 10 Cavity-mediated molecular cooling cavity cooling with neutral molecule ensembles 1: CAVITY-MEDIATED COOLING OF MOLECULES cavity-mediated effects with ion clouds molecular candidates and polarizability role of molecular internal dynamics role of inter-molecular interactions Raman-gain-enhanced dynamics

Cavity-Mediated Molecular Cooling 11 Cavity-mediated molecular cooling cavity-cooled single atom dynamics 2: FUNDAMENTALS OF CAVITY-MEDIATED COOLING cavity-mediated dynamics with ion crystals feedback cooling of collective motion onset of collective effects and super-radiance scaling for collectively-enhanced cooling sympathetic cavity-mediated cooling

Cavity-Mediated Molecular Cooling 12 Cavity-mediated molecular cooling cooling and trapping using micro-mirror arrays 3: MICRO-MIRROR ARRAYS AND OTHER CAVITIES cooling with dissipative external structures self-organization / cooling in multi-mode fields

Cavity-Mediated Molecular Cooling 13 Meetings and collaboration Preliminary meeting Royal Society, September 2007 Further review meetings Scientific exchanges Website

Cavity-Mediated Molecular Cooling