Seminars

IMPRS-APS Talk: Ultrafast electron control: from the particle accelerator on a chip to attosecond charge transfer in a Schottky junction (Prof. Dr. Hommelhoff)

Ultrafast electron control: from the particle accelerator on a chip to attosecond charge transfer in a Schottky junction

Date: Nov 8, 2018
Time: 11:30 AM - 01:00 PM (Local Time Germany)
Speaker: Prof. Dr. Peter Hommelhoff
University of Erlangen
Location: Max-Planck-Institut für Quantenoptik
Room: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32
Host: IMPRS-APS

Firstly, I will deal with a new way of accelerating charged particles based on femtosecond laser pulses and nanophotonic structures. The concept is exactly the same as in classical RF and microwave accelerators, only with roughly five orders of magnitude faster oscillating driving fields and structures that are smaller by the same factor. With the help of such small lithographically produced dielectric structures we have demonstrated not only efficient acceleration of electrons, but also deflection and focusing. Currently, we are building a prototype "accelerator on a chip". The current status will be reported. [more]

Arrival time distributions and spin in quantum mechanics-A Bohmian perspective (Siddhant Das)

Date: Nov 7, 2018
Time: 10:30 AM (Local Time Germany)
Speaker: Siddhant Das
Ludwig-Maximilians-Universität (LMU) München
Location: Max-Planck-Institut für Quantenoptik
Room: New Lecture Hall, Room B 0.32
Host: MPQ, Theory Division

The arrival time statistics of spin-1/2 particles governed by Pauli's equation, and defined by their Bohmian trajectories, show unexpected and very well articulated features. Comparison with other proposed statistics of arrival times that arise from either the usual (convective) quantum flux or from semiclassical considerations suggests testing the notable deviations in an arrival time experiment, thereby probing the predictive power of Bohmian trajectories. The suggested experiment, including the preparation of the wave functions, could be done with present-day experimental technology. [more]

Quantum simulations of non-equilibrium dynamics with ion spin chains (Jiehang Zhang)

Date: Oct 30, 2018
Time: 11:30 AM - 01:00 PM (Local Time Germany)
Speaker: Jiehang Zhang
Joint Quantum Institute of the University of Maryland
Location: Max-Planck-Institut für Quantenoptik
Room: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32
Host: MPQ, Theory Division

Trapped ions are ideal candidates for engineering quantum systems with individual resolution. Qubits are encoded with the internal levels of the ions, and controlled with laser-driven interactions. Such a system present an excellent coherence time and can find wide applications in quantum simulations and quantum computing. [more]

From Levitated Nanomagnets to Quantum Magnonics (Cosimo Carlo Rusconi)

Date: Oct 17, 2018
Time: 10:30 AM - 12:00 PM (Local Time Germany)
Speaker: Cosimo Carlo Rusconi
Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences
Location: Max-Planck-Institut für Quantenoptik
Room: New Lecture Hall, Room B 0.32
Host: MPQ, Theory Division

In this talk, I will present our results concerning how to describe and use the quantum degrees of freedom of a levitated nanomagnet. [more]

Quantum anomaly and transport in the 2D Fermi gas

Date: Oct 10, 2018
Time: 10:30 AM - 12:00 PM (Local Time Germany)
Speaker: Dr. Tilman Enss
Institut für Theoretische Physik, Karl-Ruprechts-Universität Heidelberg
Location: Max-Planck-Institut für Quantenoptik
Room: New Lecture Hall, Room B 0.32
Host: MPQ, Theory Division, hosted by Dr. Richard Schmidt

A scale invariant system looks similar on different length scales. Usually this is realized only after some fine tuning, for instance near a phase transition or a scattering resonance. Remarkably, a classical gas in two dimensions is scale invariant for an arbitrary strength of contact interaction. This has striking consequences for its nonequilibrium scaling dynamics, in particular the breathing motion in a harmonic trapping potential. [more]