Research in theoretical atomic, molecular, and optical physics is a closely cooperative endeavor. Many of the publications and doctoral dissertations that have been published by group members can be accessed by clicking here. Other JILA theory efforts in AMO physics include that of John Bohn and also that of Murray Holland.

Chris Greene My doctorate was earned at the University of Chicago under the tutelage of Ugo Fano, after completion of an undergraduate degree at the University of Nebraska. My research focus has concentrated on the development of nonperturbative methods to unravel the quantum mechanical behavior of atomic and molecular systems, especially when multiple degrees of freedom are coupled together or "correlated". The individual areas of study have included: electron correlations in two-electron and three-electron atoms; the coupling of nuclear and electronic degrees of freedom in diatomic and triatomic molecules; ultracold collisions between two or three atoms at nanokelvin temperatures; the many-body dynamics of Bose-Einstein condensates. I think it is inspiring to be involved with such talented individuals in my research group, who teach me new things every day.

	Pam Leland - Director of Sanity Pam helps to keep things at JILA a smooth, well-oiled research enterprise. She has run workshops, and helped by solving innumerable problems that arise in my group as well as in other JILA groups. If it weren't for Pam, I'd never find all those little pieces of paper I write important stuff down on and then promptly lose.

Nirav Mehta - Postdoctoral Research Associate Nirav has been working on a hyperspherical description of ultracold few-body collisions in both one and three dimensions. Recent work has been on a hyperspherical description of the four-fermion problem, and the three-body problem with multichannel two-body interactions. Publications  Three-body problem in one dimension with short-range interactions: zero-range potentials, N. P. Mehta, J. R. Shepard, Phys. Rev. A 72 032728 (2005). Low energy operators in effective theories, C. Felline, N. P. Mehta, J. Piekerawicz, J. R. Shepard, Phys. Rev. C 68 034003 (2003). Three-body recombination in one dimension (Submitted to PRA) N. P. Mehta, B. D. Esry, C. H. Greene (arXiv:quant-ph/0703127) Hyperspherical approach to the four-body problem (to be published in: Atomic Structure and Collision Processes; Narosa publishers) N. P. Mehta, S. T. Rittenhouse, J. P. D'Incao, C. H. Greene (arXiv:0706.1296)

	Jose D'Incao - Postdoctoral Research Associate My name is Jose P. D'Incao and I joined Dr. Chris Greene's group in July 2006. I've been a post-doc with Brett Esry at Kansas State University and I graduated from the Sao Paulo University (Brazil) a few years ago. Here at JILA I'm exploring fascinating few-body aspects of ultracold gases. More specifically, my goals are to develop new tools to explore the four-body problem as well as the multichannel version of the three-body problem, although I always keep my mind open to new ideas too.

	Daniel Haxton - Postdoctoral Research Associate Dan is working on calculating cross sections for the dissociative recombination (DR) of an electron with the ions LiH2+ and NO2+. Dan's home page

	Javier von Stecher - Graduate Research Assistant Javier is studying the BEC-BCS crossover problem in a fermionic gas in the vicinity of a Feshbach resonance, from both few-body and many-body perspectives.

	Zachary Walters - Graduate Research Assistant Zach works to describe the ultrafast dynamics of molecules, and how they can be seen in processes such as high harmonic generation.

	Seth Rittenhouse - Graduate Research Assistant Seth is diving into the always rich world of hyperspherical coordinates, and their application to the description of degenerate Fermi gas properties.

	Jia Wang - Graduate Research Assistant Jia is working on describing the Rydberg states of H3 using the tools of Multichannel Quantum Defect Theory (MQDT).

	John Tolsma - Undergraduate Research Assistant John is calculating cross sections for the nonsequential two-photon ionization of Barium, using the R-matrix method.

	Josh Dunn - Former Graduate Research Assistant A CU physics graduate student, Josh is studying novel cooling schemes that might prove to have advantages over current methods for creating a Bose-Einstein condensate.

	Stefano Tonzani - Former Graduate Research Assistant Stefano is tackling a number of projects that demand a description of the quantum mechanics of an electron that scatters from a complicated polyatomic molecule. This sometimes triggers vibrational excitation of the molecule, while other times it may cause the molecule to dissociate. Stefano's home page

	Heather Crowell - Former Graduate Research Assistant Heather is delving into the intriguing properties of ultra-long-range Rydberg molecules, and trying to ascertain how their spectra might be observable in line-broadening experiments with an alkali gas.

	Jason Pawlowski - Former Graduate Research Assistant Jason has begun to explore some issues in the amazing world of ultracold collision physics, of the type that occur every day in Bose-Einstein condensates and degenerate Fermi gases.

	Jeffrey Shainline - Former Undergraduate Research Assistant Jeff's research in the group has concentrated on the development of methods for description of quantum mechanical systems that have escaping or dissociating flux. His first paper calculated a number of properties of Siegert pseudostates, and showed how they can be used effectively to describe a fragmenting quantum system even when flux needs to escape a finite calculation volume. In particular, the techniques that Jeff has developed through a collaboration with Robin Santra have shown that Siegert pseudostates can avoid unphysical reflections.

Edward Hamilton - Former Graduate Research Assistant Edward's research primarily involved molecular physics. He studied the competition between photoionization and photodissociation of molecular HD. His PhD dissertation completed in the summer of 2003 involved work on a theoretical description and prediction of the detailed properties of ultra-long-range Rydberg molecules that can be formed in a Bose-Einstein condensate.  After completion of his doctoral dissertation, Edward joined the research group of Tamar Seideman at Northwestern University, as a postdoctoral research associate. Papers  Calculation of a preconvolved HD photoionization spectrum using the rovibrational frame transformation, E. L. Hamilton, C. H. Greene, and J. A. Stephens, Physics Essays 13, 265-271 (2000). Quantum and semiclassical analysis of long-range Rydberg molecules, B. E. Granger, E. L. Hamilton, and C. H. Greene, Phys. Rev. A 64, 042508 (2001). Competition among molecular fragmentation channels described with Siegert channel pseudostates, E. L. Hamilton and C. H. Greene, Phys. Rev. Lett. 89, 263003 (2002).

Viatcheslav Kokoouline - Former Postdoctoral Research Associate Slava's research before he joined our group involved studies of ultracold two-body collisions, and he wrote a number of papers on that topic. His research in Boulder  focussed on a complex and detailed study of dissociative recombination that occurs when an electron collides with a triatomic hydrogen ion.  He has since assumed a tenure-track faculty position at the University of Central Florida, in Orlando. Papers  Click here for a listing of publications.

Robin Santra - Former Postdoctoral Research Associate Robin's PhD research at the University of Heidelberg with L. Cederbaum dealt with the behavior of molecule or cluster exposed to X-ray radiation. In Boulder, Robin explored the behavior of atomic and molecular systems exposed to an attosecond laser pulse, and he also developed a description of two excited alkaline earth atoms that interact in an ultracold environment. His interests include possible schemes in the alkaline earth atoms that might serve as a new system for creation of an improved frequency standard.  After leaving the group in August of 2004, Robin assumed a position as a postdoctoral research associate at ITAMP, at the Harvard-Smithsonian Center for Astrophysics. Papers  Click here for a listing of publications.

Jeff Wyss - Former Undergraduate Research Assistant Jeff is a CU undergraduate who helped us to develop a model of the pump-probe experiments of the Murnane-Kapteyn group. These quantum mechanical phenomena utilize molecular rotations to coherently control and shorten the duration of the probe laser pulse, after it propagates through a gas like CO2 that was initially excited by a 20 femtosecond pump laser pulse.

	Kevin Christ - Former Undergraduate Research Assistant Kevin was a CU undergraduate who earned an honors thesis in connection with his major in Physics. As the major part of his honors thesis research, Kevin set up improved ways of carrying out the quantum mechanical calculations needed to describe the long-range interaction between two strontium atoms.

Nille Klausen - Former Exchange Student from Copenhagen Nille focussed her research on ultracold two-body collisions. Her main effort was a calculation that ascertains the type of spinor condensates that can be formed using the 85 or 87 isotopes of atomic rubidium.  She also worked on finding properties of atomic tritium, in a project that assessed the feasibility of forming a tritium BEC.  Nille is now in graduate school in Sweden. Papers  Nature of spinor Bose-Einstein condensates in rubidium, N. Klausen, J. L. Bohn, and C. H. Greene, Phys. Rev. A 64, 053602 (2001).

Mark Baertschy - Former Postdoctoral Research Associate Mark studied the famous three-body Coulomb continuum problem for his thesis research before he arrived in Boulder. He specializes in "exact" solutions of the three-body time-independent Schroedinger equation to describe (e,2e) processes in simple atoms. In Boulder, he has continued that work, and is also tackling problems involving the behavior of an atom or molecule in an intense laser field.  Mark is onw an assistant professor of physics at CU-Denver. Papers  Click here for a listing of publications.

Amber Young - Former Undergraduate Research Assistant Amber spent some time in the group developing quantal and semiclassical descriptions of the mechanisms by which an intense laser field can eject two electrons from an atom. She joined the group while she was away from her undergraduate institution, Middlebury College.  Now, since graduating, she has found employment in the private sector, in the Chicago area.

Brian Granger - Former Graduate Research Assistant Brian's research concentrates on the development of semiclassical approximation methods that can be used to sort out the dynamics of nonseparable quantal systems. His research connected the Gutzwiller-type methods of "quantum chaos" and accurate quantum mechanical treatments such as quantum defect theory.  After Brian was an ITAMP postdoctoral research associate at the Harvard-Smithsonian Center for Astrophysics, he moved into a tenure-track faculty position in the University of Santa Clara Physics Department. Papers  Extending Closed Orbit Theory using Quantum Defect Ideas, I: Basic Concepts and Derivations, B. E. Granger and C. H. Greene, Phys. Rev. A 62 , 012511 (2000). Quantum and semiclassical analysis of long-range Rydberg molecules, B. E. Granger, E. L. Hamilton, and C. H. Greene, Phys. Rev. A 64, 042508 (2001).

Bogdan Borca - Former Postdoctoral Research Associate Bogdan's doctoral research at the University of Nebraska with Anthony Starace dealt with the behavior of an atom or negative ion in a strong laser field. While he was a postdoctoral associate in this group, he studied the way molecules form when a magnetic field is ramped suddenly in the vicinity of a Feshbach resonance, for Bose-Einstein-condensed 85Rb atoms.

Doerte Blume - Former Postdoctoral Research Associate Doerte arrived in Boulder with extensive experience in quantum Monte Carlo methods. It still boggles the mind that you can solve Schroedinger's equation by "throwing dice". In Boulder, she has combined those techniques with hyperspherical coordinate methods to describe a class of cluster excited states, and she has also studied correlation effects in some microscopic-size Bose-Einstein condensates.  Now she is on the Physics Department faculty at Washington State University. Papers  Click here for a listing of publications.

	[Home ] [C.H. Greene ] [Publications ] [AMO Theory ] [This Semester ] [Schedule ]