AMO Seminars

Algebraic Approach to Phase Problem

Speaker: 
Pavel Trochtchanovitch
Event Date and Time: 
Thu, 2017-02-02 15:00 - 16:00
Location: 
Henn 309
Local Contact: 
Kirk Madison
Intended Audience: 
Graduate

In this talk we’ll discuss a “phase problem” – reconstruction of a signal from absolute value of its Fourier transform; with the only constraint being finite (though not known exactly) signal support.

With the help of “sampling theorem” it will be shown how this “phase problem” is equivalent to a system of non-linear equations; a fundamental difference between numerical solutions for 1D and 2D cases will be illustrated (why 1D case result in 2 to the power of ”number of points” solutions, and 2D case doesn’t?), and several numerical examples will be presented.

 

Measuring Everything You've Always Wanted to Know About a Light Pulse

Speaker: 
Rick Trebino, Georgia Institute of Technology
Event Date and Time: 
Thu, 2017-03-23 12:30 - 13:30
Location: 
Henn 304
Local Contact: 
Valery Milner
Intended Audience: 
Graduate

The vast majority of the greatest scientific discoveries of all time have resulted directly from more powerful techniques for measuring light.  Indeed, our most important source of information about our universe is light, and our ability to extract information from it is limited only by our ability to measure it.

Discovering and Harnessing Molecular Scale Driving Forces at the Nano/Bio Interface

Speaker: 
Jim Pfaendtner, Department of Chemical Engineering, University of Washington
Event Date and Time: 
Thu, 2017-01-26 15:30 - 16:30
Location: 
Chem D-215
Local Contact: 
Keng Chou
Intended Audience: 
Graduate

Rational design of unique solvents and surfaces holds great potential for providing new ways to use biomolecules in engineering applications, which range from biocatalysis in ionic liquids (ILs) to surface-driven self-assembly of nano/bio materials that mimic nature. Computational models such as molecular dynamics (MD) can connect the atomic scale to the mesoscale for a wide range of problems but many challenges still limit wide-ranging use of these tools to their full potential.

From Ultralong-range Molecules to Rydberg Polarons in a Bose Gas

Speaker: 
Thomas C. Killian, Rice University
Event Date and Time: 
Wed, 2016-10-05 14:30 - 15:30
Location: 
Chem D-213
Local Contact: 
Ed Grant
Intended Audience: 
Graduate

 

Rydberg atoms excited in a dense gas interact very strongly with background, ground-state atoms that lie within the Rydberg orbital. This problem has a long history, and it inspired Fermi to develop the Fermi pseudo-potential to describe the low-energy scattering of a Rydberg electron and ground-state atoms. With the availability of ultracold atomic gases, this topic has received renewed interest.

Towards High Precision Frequency Comb Spectroscopy in the Extreme Ultraviolet

Speaker: 
Gil Porat JILA/University of Colorado Boulder
Event Date and Time: 
Fri, 2016-08-26 14:00 - 15:00
Location: 
AMPEL 311
Local Contact: 
David Jones
High precision spectroscopy of few-electron atoms and ions is strongly motivated by the need to test fundamental theory (e.g. quantum electrodynamics) in simple systems, amenable to precise calculation for comparison with experimental measurement. Additionally, transitions from the ground state are most susceptible to nuclear structure effects (e.g. charge radius), making them appealing as tools for testing nuclear structure theory.

Orientation and Alignment Echoes

Speaker: 
Ilya Averbukh, Weizmann Institute of Science
Event Date and Time: 
Thu, 2016-07-14 12:30 - 13:30
Location: 
Hennings 302
Local Contact: 
Valery Milner
Intended Audience: 
Graduate

 

Echoes are common in many areas of physics, including NMR, plasma physics, nonlinear optics, cavity quantum electrodynamics, cold atoms physics, and even high energy hadron beams experiments.

Recently we discovered (probably) the simplest classical system featuring the echo phenomenon — a collection of randomly oriented free rotors with dispersed rotational velocities. Following excitation by a pair of time-delayed impulsive kicks, the mean orientation or alignment of the ensemble exhibits multiple echoes in space and time.

Magnetically manipulated atomic and molecular beams

Speaker: 
Gil Alexandrowicz, Technion - Israel Institute of Technology
Event Date and Time: 
Mon, 2016-06-20 14:00 - 15:00
Location: 
Chem D-215
Local Contact: 
Roman Krems
Intended Audience: 
Graduate

A common theme to the activities in our group is magnetically manipulating beams of atoms and molecules. In this talk I will briefly describe the different types of experiments which use magnetic manipulations.  In the first type we exploit the nuclear spin of a helium-3 atom to perform time-depended atom-interferometry experiments.

From ultracold to ultrafast, two instances of analogue simulation using cold atoms

Speaker: 
Frédéric Chevy (Ecole Normale Supérieure)
Event Date and Time: 
Mon, 2016-04-18 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Kirk Madison
Intended Audience: 
Graduate

Over the past few years, ultracold atoms have emerged as priviledged platfoms for the experimental exploration of quantum many-body physics. To demonstrate the versatility of ultracold atomic techniques, I will discuss during my talk two experiments performed recently at ENS addressing widely different physical situations. In the first part, I will show how the possibility of tuning interatomic interactions have paved the road to the observation of the first double Bose-Fermi superfluids.

Combining Ytterbium and Lithium: Molecules and Quantum Degenerate Mixtures

Speaker: 
Subhadeep Gupta
Event Date and Time: 
Thu, 2016-03-31 16:00 - 17:00
Location: 
Chem D-215
Local Contact: 
Kirk Madison
Intended Audience: 
Graduate

I will present our recent experimental work on ultracold mixtures of ytterbium and lithium atoms. Employing ytterbium in an excited metastable (3P2) state, we have measured magnetic field dependent interactions with lithium ground state atoms co-confined in an optical trap. Our observations provide first evidence for Feshbach resonances in a mixture of alkali and alkaline-earth-like atoms [1, 2]. Using a dual-species magneto-optical trap we have formed YbLi* molecules through photoassociation resonances, providing a first step for coherent production of ultracold doublet-sigma molecules.

IRTG "Cold Controlled Systems" (CoCo) - Kick-off Meeting

Event Date and Time: 
Tue, 2015-07-28 09:00 - Fri, 2015-07-31 16:00
Location: 
MSL 102
Local Contact: 
Takamasa Momose
Intended Audience: 
Undergraduate

-------------------------------------
Program: Tuesday, July 28th, 2015
MSL 102

09.00 – 09.30        Takamasa Momose, Frank Stienkemeier: Introductory remarks

A1. Interactions and Collisions Dynamics between Atoms, Molecules and Surfaces

09.30 – 10.15        Overview Topic – Marcel Mudrich "New trends in cold reactions"
10.15 – 10.35    Manish Vashishta (T. Momose)
    
10.35 – 10.55    Coffee break (MSL101)
    

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