“Controlling electrons with oscillating fields: from a quantum electron microscope to fully coherent electron physics at needle tips” by Peter Hommelhoff (University of Erlangen)

Date: 
Thursday, April 14, 2016 - 4:00pm to 5:00pm
Series: 
Physics and Astronomy Colloquium

Thursdays, 4:00-5:00 pm

1-434 Physics and Astronomy (map)
Reception from 3:30-4:00 p.m.
(unless otherwise posted)

Guest Speaker: Peter Hommelhoff (University of Erlangen)

Talk Title:  “Controlling electrons with oscillating fields: from a quantum electron microscope to fully coherent electron physics at needle tips”

Abstract:

Ever since the invention of the electron microscope it became clear that excellent control over electrons can lead to great instruments. Based mostly on fields that are constant in time, today's electron microscopes allow imaging with atomic resolution. Yet one still remains: the specimen to be imaged can be damaged by the electron beam. By virtue of quantum mechanics, this problem may be solved. Quantum mechanical measurement protocols exist that allow imaging with much smaller energy deposition than in the classical case, in so-called interaction-free measurements. We will show first elements needed to build a quantum electron microscope, with a focus on our microwave-field driven linear Paul traps for electrons.  In the second part of the talk we will discuss fully coherent electron behavior in the optical near-field of a needle tip. Photo-emitted electrons can be driven back to the parent needle tip within a cycle of the femtosecond laser driving field. We observe hallmarks of (fully coherent) attosecond physics -- at a nanoscale solid.

For more information, contact Jay Hauser

We thank the following people for their contributions to the wine fund for the post-colloquium reception:
Prof. Dolores Bozovic, Prof. Mike Cornwall, Prof. Bob Cousins, Prof. Andrea Ghez, Prof. Karoly Holczer, Prof. Eric Hudson, Robert Huff, Prof. Alex Kusenko, Prof. Myank Mehta, Prof. John Miao, Prof. Roberto Peccei, Prof. Claudio Pellegrini, Prof. David Saltzberg, Prof. Jean Turner and Prof. Ben Zuckerman.

Event Attachments: 
Location: 
1-434 PAB