ansprechpartner

Dr. Stephan Dürr
Stephan Dürr
Gruppenleiter

Telefon: +49 89 3 29 05 - 291
Raum: A 2.22
Prof. Dr. Thomas Udem
Thomas Udem
Wissenschaftler

Telefon: +49 89 3 29 05 - 282 // -257
Raum: D 0.21 // D 0.39




kommende Kolloquien

  • The colloquium series will resume at the beginning of the next term in April/October.

Kolloquien

Kolloquien

Die Gastvorträge im Rahmen des MPQ-Kolloquiums finden von April bis Juli sowie von Oktober bis Januar jeweils dienstags um 14:30 Uhr statt. Verantaltungsort ist der Herbert-Walther-Hörsaal im Foyer des Max-Planck-Instituts für Quantenoptik.

Ansprechpartner für die wissenschaftliche Organisation:

Dr. Stephan Dürr und Dr. Thomas Udem

Wenn Sie einen Vortrag im Livestream verfolgen möchten, ist es nötig, dass Sie sich in eine entsprechende Mailing Liste eintragen. Daraufhin erhalten Sie Instruktionen zum Empfang des Livestreams.

Monat:

"Ultrafast and Nonlinear X-Ray Scattering in Solids."

"There has been remarkable progress on using the combination of short pulse, high spatial coherence and large flux from x-ray free electron lasers (FEL) for nonperiodic imaging and nanocrystallography. The possibility of atomic-scale imaging remains a primary motivation for the construction of FELSs. Their unprecedented properties also motivate the study the dynamics of atomic-scale fluctuations directly in the time-domain. However, an important open question is under what conditions the textbook picture of linear, x-ray–matter interactions holds. In this colloquium, I will describe evidence for coherent nonlinear interactions at LCLS and SACLA FELs as well as the first direct time-domain measurements of the dispersion relation for lattice vibrations in photo-excited materials." [mehr]

"Few-cycle intense mid-IR waveforms and novel electron dynamics: Strong field physics and extreme nonlinear optics in the mid-IR."

"Liberation of an electron is the first step of the recollision model describing high order harmonic generation and attosecond pulse generation. Orbital tomography and electron self-diffraction imaging furthermore intimately rely on a firm grasp of electron dynamics in the Coulomb field of their parent molecular ion. These strong field effects all rely on tunneling dynamics which we study with true mid-IR waveforms. I will show unexpected electron dynamics, and first 3D momentum measurements, when probed, without the ubiquitous ambiguities at the Ti:Sa range, in the non-perturbative tunneling regime. The availability of intense ultrashort pulses at 3100 nm permits exploitation of nonlinear pulse propagation in the anomalous dispersion regime leading to interesting X-wave dynamics, unprecedentedly large supercontinua and stable pulse self-compression in bulk media." [mehr]

"Variational methods in quantum many-body physics."

"We will review successes and limitations of the variational method in quantum many-body physics; both the time-independent and the time dependent variational method will be illustrated. Special attention will be paid to the role of entanglement in strongly correlated systems and quantum field theory, to classes of wavefunctions that naturally encompass the required entanglement, and to Ansätze for describing elementary excitations and particles on top of the strongly correlated vacuum." [mehr]

"A Centrifuge Decelerator: Slowing down Molecular Beams with an Inertial Force."

"Achieving better control and ability to manipulate molecules by decelerating and cooling them is important for various fields of research, such as, many-body physics, quantum information science, cold chemistry, investigation of the fundamental properties of matter, etc. Towards this end, here we present the concept of and demonstrate the first experimental results from a novel and versatile decelerator for continuous beams of neutral polar molecules, which employs the centrifugal potential in a rotating frame. With this technique, deceleration of continuous supersonic beams from a cryogenic source is conceivable. This is expected to provide large samples of slow and internally cold molecules amenable to further cooling down to quantum degenerate regimes." [mehr]

"Strong-field-induced electron dynamics and attosecond phenomena in solids."

"In this talk, I will give an overview of our recent work on studying electron dynamics in dielectrics exposed to few-cycle laser pulses with a peak intensity just below the damage threshold. Until recently, detailed time-resolved measurements of electron dynamics in this extreme regime of light-matter interaction used to be out of reach. The situation has recently changed due to the progress in the generation of few-cycle laser pulses and the related progress in attosecond physics. After a brief presentation of recent experiments performed in the Laboratory for Attosecond Physics (MPQ, Garching), I will report on our related theoretical work, where we studied the dynamics of interband excitations and the light-driven motion of charge carriers under conditions where the conventional nonlinear optics breaks down, and the Bragg-like scattering of electrons at edges of the Brillouin zone (Bloch oscillations) starts to play an important role." [mehr]

 
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