讲座题目：Ultracold Quantum Gases –A Fascinating Playground for Basic Research in Physics
主讲人：Priv.-Doz. Dr. Axel Pelster
主持人：武海斌
开始时间：2017-10-17 上午10点
讲座地址：理科大楼A814
主办单位：精密光谱科学与技术国家重点实验室
报告人简介：
1. Personal Details:
Name: Priv.-Doz. Dr. Axel Pelster
Birth: 12/05/1966 in Backnang, Germany
Nationality: German
Family status: married, 3 children
Official position: Scientific Collaborator
ResearcherID: O-4591-2015
Official Address: Department of Physics, Technical University of Kaiserslautern
Erwin Schr¨odinger Straße, Geb¨aude 46, 67663 Kaiserslautern
Telephone: +49-631-205-2270
Fax: +49-631-205-3907
Email: axel.pelster@physik.uni-kl.de
Website: http://www-user.rhrk.uni-kl.de/~apelster/index.html
Private Address: Forststraße 49, 12163 Berlin, Germany
phone: +49-30-79706448, cellular phone: +49-179-1056074
2. Professional History:
08/1986–07/1992: Physics Studies at University of Stuttgart
02/1987–06/1992: Scholarship of German National Scholarship Foundation
08/1992–02/1996: PhD student (BAT IIA/2), University of Stuttgart
04/1996–02/2004: Postdoc (BAT IIA) and Assistent (C1), Free University of Berlin
01/2004: Habilitation and Private Lecturer, Free University of Berlin
Research stays: Washington University in St. Louis (2001)
Massachusetts Institute of Technology in Cambridge (2002)
02/2004–09/2008: Main Scientific Assistent (C2), University Duisburg-Essen
10/2008–09/2009: Visiting Professor, Free University of Berlin
10/2009–07/2010: Visiting Professor, University of Potsdam
08/2010–03/2011: Main Scientific Assistent (C2), University Duisburg-Essen
04/2011–09/2011: Visiting Professor, University of Bielefeld
10/2011: Main Scientific Assistent (C2), University Duisburg-Essen
11/2011–03/2012: Fellow at Hanse Institute of Advanced Studies, Delmenhorst
04/2012–09/2012: Scientific Collaborator, Technical University of Kaiserslautern
10/2012–02/2013: Fellow at Hanse Institute of Advanced Studies, Delmenhorst
01/2013: Adjunct Professor of ICRANET Faculty
03/2013–03/2016: Scientific Collaborator (TV-L 13), Technical University of Kaiserslautern
since 04/2016: permanent Scientific Collaborator (TV-L 13), Technical University of Kaiserslautern
3. Research Fields:
• Ultracold quantum gases: dirty bosons, dipolar quantum gases, bosons in optical lattices,
rotating BECs, boson-fermion mixtures, spinor Bose and Fermi gases, photon Bose-Einstein
condensate
• Nonlinear dynamical systems: synergetics, time delays, retinotopic projections, Markov processes
• Quantum field theory: path and functional integrals, recursive graphical construction of Feynman diagrams, variational perturbation theory, critical phenomena, renormalization-group theory
• General relativity: anholonomic space-time transformations, gravity with torsion, Bose stars
报告摘要：
The talk provides an introduction into ultracold dilute atomic gases and discusses several illustra-tive examples where this emerging field allows important insights into basic research in physics.
We start with reviewing the properties of Bose-Einstein condensates (BECs) with the anisotropic and long-range dipole-dipole interaction. To this end we investigate the influence of quantum fluctuations upon the equilibrium configuration and the time-of-flight dynamics. Furthermore, we report about recent experiments with atomic magnetic dipolar Bose gases, which detected beyond mean-field effects due to the emergence of incompressible quantum droplets.
Furthermore, we report on recent progress in understanding the properties of ultracold bosonic atoms in potentials with quenched disorder. This notoriously difficult dirty boson problem is experimentally relevant for the miniaturization of BECs on chips and can also be studied by tailoring disorder potentials via laser speckle fields. Theoretically it is challenging because of the competition of localization and interaction as well as of disorder and superfluidity.
Finally, we consider systems of ultracold bosonic gases in optical lattices, which have recently become a popular research topic as they represent model systems for quantum phase transitions in solid-state physics with a yet unprecedented level of control. In order to determine the location of the quantum phase transition from the superfluid to the Mott phase we work out a Ginzburg-Landau theory for the underlying Bose-Hubbard model. Finally, we elucidate one intriguing example, where this quantum phase transition can be tuned by suitable system parameters.