Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Institut für Physik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Kolloquium | Alle Termine | Institutskolloquium: Prof. Peter Krüger (PTB, Department Biosignals und University of Sussex, Department for Physics and Astronomy, Brighton)

Institutskolloquium: Prof. Peter Krüger (PTB, Department Biosignals und University of Sussex, Department for Physics and Astronomy, Brighton)

Vortrag: Atomic gases as probes: from exploring dimensional crossovers to magnetic sensing of human brain activity.
  • Wann 31.05.2022 von 15:00 bis 17:00
  • Wo Zoom & Lise-Meitner-Haus, Christian-Gerthsen-Hörsaal, Newtonstraße 15, 12489 Berlin
  • iCal

Institutskolloquium: Prof. Peter Krüger (Physikalisch-Technische Bundesanstalt, Department Biosignals, Berlin, Germany und University of Sussex, Department for Physics and Astronomy, Brighton, United Kingdom) spricht zum Thema: "Atomic gases as probes: from exploring dimensional crossovers to magnetic sensing of human brain activity."

 

Abstract:
The ever-increasing quality of preparation, control and detection of quantum systems of a variety of types has made an enormous impact on science and technology over the decades. Ensembles of neutral atomic gases represent a quantum platform with advantages such as long coherence times, small and controllable inter-particle interactions, and precisely known spectra. Laser light interaction with the atomic ensemble is a key tool both for preparing well-defined quantum states and for reading out the state of the system. The arguably most important example of the former is the extremely powerful tool of laser cooling that is the basis for the preparation and study of quantum degenerate gases forming at ultralow temperatures not reached by any other method of cooling. Here we show how such gases can be used to illustrate and explore the nature of ordering phenomena, especially in low dimensional settings. Beyond this ability to shed light on general phenomena in quantum physics, dilute quantum gases can also be used as a sensor head for more practical applications such as determining minute details of electric current flow patterns in novel functional materials such as ultrathin and transparent conductors with relevance for example in next-generation touchscreens.
Even gases of thermal atoms at room or slightly elevated temperatures can be employed as central element of high-performance magnetometers with sensitivities comparable to those otherwise only reached by superconducting (SQUID) sensors. Here again, there is a phenomenal breadth of applications, ranging from fundamental studies of physics beyond the standard model to quality assurance in electric vehicle batteries and even imaging of neuronal activity in the human brain. In this talk, we will discuss some of the possibilities and demonstrated performance of atomic gas sensors and give examples of emerging practical applications.

 

Das Kolloquium wird voraussichtlich "hybrid" durchgeführt, kann also sowohl im Hörsaal als auch über zoom verfolgt werden. Die Anmeldedaten werden im Vorfeld über die üblichen Mailverteiler versandt oder können unter gd-at-physik.hu-berlin.de erfragt werden.