Past Atomic/Molecular/Optics Talk

Mon, 2012-01-16 15:00
David Tannor (Weizmann Institute of Science
Chem D-215
Ever since the advent of Quantum Mechanics, there has been a quest for a trajectory based formulation of quantum theory that is exact. In the 1950’s, David Bohm developed an exact formulation of quantum mechanics in which trajectories evolve in the presence of the usual Newtonian force plus an additional quantum force. However, closer inspection of the Bohmian formulation reveals that the nonlocality of quantum mechanics has not disappeared --- it has simply been swept under the rug into the quantum force.
Thu, 2012-01-19 17:30
Klaus Mueller-Dethlefs (Manchester)
Chem D-215
Bose-Einstein Condensation (BEC) was first achieved in the liquid phase in helium a century and, for gas phase atoms, a decade ago. The question arises if there could be a third BEC of a solid, crystalline, state. A possible pathway towards such a new state of matter is a quantum plasma for which the de Broglie wavelength becomes larger than the mean distance between particles. For the electrons in an ultra-cold ion-electron plasma this condition is fulfilled for a temperature below 0.1K and a density above 1015 cm3.
Fri, 2012-02-03 16:00 - 17:00
Mark Raizen (UT Austin)
Chem D-215
In this talk I will report on our progress towards trapping of a single atom in the ground motional state "on demand." I show that realization of this step at ultrahigh fidelity is an enabling resource for quantum computing.
Fri, 2012-02-10 13:00 - 14:00
David Pekker (Caltech)
Hennings 318

We study a two dimensional gas of repulsively interacting bosons in the presence of both an optical lattice and a trap using optical lattice modulation spectroscopy. The strongly interacting superfluid supports two types of low energy modes associated with the symmetry breaking at the phase transition: gapless phase (Goldstone) modes and gapped amplitude (Anderson-Higgs) modes.

Thu, 2012-03-15 17:30 - 18:30
Toshinori Suzuki (Kyoto University and RIKEN, JAPAN)
Chem D-215
Ultrafast internal conversion processes in isolated aromatic molecules were studied by time-resolved photoelectron imaging spectroscopy with 22-fs time-resolution. Visualization of speed and angular distribution of photoelectrons revealed non-adiabatic dynamics and vibrational wave packet motions in the excited states. We also succeeded in ultrafast photoelectron spectroscopy using liquid beams, which allows observation of non-adiabatic electronic dynamics in bulk solutions. Examples of electron transfer from halogen atom anion to polar protic solvents (water and alcohols) are presented.
Fri, 2012-03-16 13:00 - 14:00
Aditi Mitra (NYU)
Henn 318

How an interacting many-particle system prepared in an initial state which is far from equilibrium evolves in time, and how it thermalizes if at all, is an important and open question which is also of experimental relevance. In this talk I will consider a system of interacting bosons that are initially out of equilibrium due to an interaction quench.

Thu, 2012-03-22 17:30 - 18:30
Alexander Lvovsky (Univ of Calgary)
Chem D-215

Although the quantum nature of light has been discovered over a century ago, controlling its quantum states still presents a considerable challenge. The past decade has shown significant progress in solving it. We are learning to produce and measure arbitrary quantum optical states, save them in memory cells and even bring them into interaction with each other. Mastering these abilities is paramount for many applications of quantum information technology.

Thu, 2012-04-19 10:00 - 11:00
Casey Bloomquist
Hennings 318

Sequences of ultrashort laser pulses have been used to control rotational excitation of ensembles of molecules.

Mon, 2012-04-30 02:30 - 03:30
Yasuhiro Ohshima
Chem D-215

When a gaseous molecular sample is irradiated by an intense nonresonant ultrashort laser pulse, the laser field exerts a torque that aligns the molecular axis along the laser polarization vector, due to the interaction with the molecular anisotropic polarizability.  Here the field–molecule interaction only remains in much shorter duration than the characteristic time for molecular rotation, and thus the rotation of the molecules is coherently excited to create a rotational quantum wave packet (WP).  We have developed a method to explore the nonadiabatic excitation in a quantum-state resolve

Thu, 2012-05-31 16:30 - 17:30
Nicolas Vanhaecke
Chem D215

The achievements and prospects opened by atoms in the cold and ultracold regimes cover an impressive range of topics: from precision measurements for fundamental physics, metrology, mesoscopic physics and quantum information to applied physics, such as atomic clocks or ultracold ion beams.

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