AMO Seminars

Robust design principles for quantum enhanced excitation transport

Speaker: 
Andreas Buchleitner
Event Date and Time: 
Wed, 2014-06-11 14:00 - 15:00
Location: 
Chem D-215
Local Contact: 
Roman Krems
Intended Audience: 
Graduate

With the advent of new spectroscopic data a debate has been (re-)launched on      the possible role of quantum coherence for efficient photosynthetic light harvesting. While the issue in itself is still wide open, the debate between physicists specializing on quantum or biological matter stimulates challenging questions and opens new and intriguing perspectives.

Quantum optical control of mechanical systems: from levitated nano-spheres to gravitational wave detectors

Speaker: 
Markus Aspelmeyer (University of Vienna)
Event Date and Time: 
Wed, 2014-02-12 13:00 - 14:00
Location: 
Henn 318
Local Contact: 
Philip Stamp
Intended Audience: 
Graduate

Atoms at Resonance: Scattering and losses of a Bose gas at unitarity

Speaker: 
Andrew Grier, Ecole Normale Superieure, Laboratoire Kastler Brossel
Event Date and Time: 
Fri, 2013-12-06 11:00 - 12:00
Location: 
Henn 318
Local Contact: 
Kirk Madison
Intended Audience: 
Graduate

Tunability of the two-body scattering properties in ultracold atomic gases has proven to be a powerful tool in recent years, providing the first direct experimental evidence of long-predicted Efimov states and allowing for quantum simulation of unreachable or computationally intractable systems.  In this talk, we will review recent experimental and theoretical results centered around ultracold atomic Bose gases taken close to a scattering resonance where the two-body scattering cross-section diverges.  We will focus on measurements of the decay of a non-degenerate gas both at and in the vic

Studying Nanoscale Magnetization Dynamics and Ratiometric Thermometry Using Spectroscopy

Speaker: 
Dr. Chih-Hao Hsia (Researcher Center for Applied Sciences, Academia Sinica)
Event Date and Time: 
Fri, 2013-11-29 16:00 - 17:00
Location: 
Chem D-215
Local Contact: 
Keng Chou
Intended Audience: 
Graduate

Defect-induced supersolidity with soft-core Bosons

Speaker: 
Guido Pupillo
Event Date and Time: 
Fri, 2013-10-18 11:00 - 12:00
Location: 
Henn 318
Local Contact: 
Roman Krems
Intended Audience: 
Graduate

We discuss the quantum phases and dynamics of two-dimensional Bosons with finite-range soft-core interactions. In particular, we demonstrate that the ground state can be a commensurate density-wave-type supersolid. For low densities, the system is shown to form a solid in which superfluidity is provided by delocalized zero-point defects. This provides the first example of continuous-space supersolidity consistent with the Andreev-Lifshitz-Chester scenario. We discuss the possibility to observe some of these phases in cold atomic and molecular gases.

Structure and Dynamics of Water Interfaces Revealed by Novel Interface-Selective Nonlinear Spectroscopy

Speaker: 
Tahei Tahara (RIKEN, Japan)
Event Date and Time: 
Tue, 2013-11-05 16:00 - 17:00
Location: 
Chem D-215
Local Contact: 
Taka Momose
Intended Audience: 
Graduate

Second-order nonlinear spectroscopy provides interface-selective spectral information, and it is an indispensable tool to study interfaces. Recently, we developed multiplex phase-sensitive heterodyne-detected electronic and vibrational sum-frequency generation (HD-ESFG [1] and HD-VSFG [2]) spectroscopies, which enable us to directly measure the imaginary and real parts of the electronically and vibrationally resonant second-order susceptibility (c(2)).

An electron electric dipole moment experiment using a fountain of laser-cooled francium

Speaker: 
Harvey Gould
Event Date and Time: 
Fri, 2013-07-19 16:00 - 17:00
Location: 
Chem D-215
Local Contact: 
John Behr
Intended Audience: 
Graduate

Experimental bounds on the electric dipole moment (EDM) of the electron and other EDMs are already below predictions of some simple standard model extensions. An experiment, with the careful control of systematic effects, has been designed to discover or rule out an electron EDM as small as a factor of 100 below the present limit. Collaborators working on this experiment have previously completed and published four electron EDM experiments, including the first to use laser-cooled atoms.

Ultracold hydrogen atoms: a versatile coolant for producing microkelvin molecules

Speaker: 
Jeremy M. Hutson (Durham University, UK)
Event Date and Time: 
Fri, 2013-07-05 16:00 - 17:00
Location: 
Chem D-215
Intended Audience: 
Graduate

There are several experimental methods that are capable of producing samples of molecules such as ND3, OH and NH at temperatures of 10 to 100 mK in electrostatic or magnetic traps. These include helium buffer-gas cooling and molecular beam deceleration. However, there is so far no way to transfer these cold molecules to the ultracold regime below 1 mK.

Control and Manipulation of the Kerr-lens Mode-locking Dynamics in Lasers

Speaker: 
Shai Yefet (Bar-Ilan University)
Event Date and Time: 
Mon, 2013-06-17 11:00 - 12:00
Location: 
Chem D-215
Local Contact: 
Valery Milner
Intended Audience: 
Graduate

In the following lecture I will describe theoretical and experimental studies of mode-locked solid-state lasers, specifically a Kerr-lens mode-locked titanium:sapphire laser. This laser is the major source for ultra-short optical pulses, which provides an extremely important tool to investigate ultra-fast processes in physics, chemistry and biology. Specifically, I will present novel cavity designs and configuration, which overcome many of the disadvantages and inherent limitations of standard designed Ti:sapphire optical cavities.

Super Efimov effect

Speaker: 
Dr. Sergej Moroz (INT, University of Washington)
Event Date and Time: 
Thu, 2013-05-30 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Fei Zhou
Intended Audience: 
Graduate

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