- https://www.cells.es/en/media/events/alba-staff/multi-mhz-time-of-flight-momentum-microscopy
- Multi-MHz time-of-flight momentum microscopy
- 2017-07-21T12:30:00+02:00
- 2017-07-21T13:30:00+02:00
- Christian Tusche from Forschungszentrum Jülich GmbH and Fakultät für Physik, Universität Duisburg-Essen. Gemany
- What
- events
- When
- Jul 21, 2017 from 12:30 PM to 01:30 PM (Europe/Madrid / UTC200)
- Where
- ALBA Synchrotron, Marie Curie Briefing room
- Contact Name
- Inma Hernandez
- Contact Phone
- 935924389
- Attendees
- NOTE: If you are interested in attending, please contact Inma Hernández with your Identity Card number and name to obtain the ALBA access.
- Web
- Visit external website
- Add event to calendar
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Abstract
By using a photoelectron emission microscope (PEEM) we commonly look at strongly magnified images of a sample's surface in real space. Likewise, a momentum microscope utilizes the principles of electron microscopy to form a high resolution image of the distribution of electronic states in reciprocal (i.e., momentum-) space [1]. Such two- dimensional (kx,ky) maps of the photoelectron distribution represent sections through the valence electronic states in the full surface Brillouin zone, and give a comprehensive and intuitive access to the electronic properties of a material. Together with advanced time-of- flight (ToF) detection schemes the full band information becomes available within minutes.
Of particular importance is the spin of the electron, that gives rise to phenomena like ferromagnetism, superconductivity, spin-polarized surface states, and recently, the discovery of new material classes with complex spin textures like topological insulators. With the introduction of imaging spin analyzers [2] the efficiency of spin-resolved measurements experienced a tremendous boost, such that the electron spin now becomes routinely accessible in a photoemission experiment.
We will discuss applications and prospects, including spin-textures of topological materials [3], spin-orbit- and exchange-interaction in ferromagnets [4], and rapid band structure mapping by multi-MHz ToF momentum microscopy [5]. The results pave the way to comprehensive 3D band mapping with complete wave-vector-, spin-, and time-resolution at next generation light sources.
References
[1] C. Tusche, A. Krasyuk, J. Kirschner, Ultramicroscopy 159, p. 520 (2015)
[2] C. Tusche, M. Ellguth, A. A. Ünal, C.-T. Chiang et al., Appl. Phys. Lett. 99, 032505 (2011) [3] H. Maaß, H. Bentmann, C. Seibel, C. Tusche et al., Nat. Commun. 7, 11621 (2016)
[4] M. Ellguth, C. Tusche, J. Kirschner, Phys. Rev. Lett., 115, 266801 (2015)
[5] C. Tusche, P. Goslawski, D. Kutnyakhov, M. Ellguth et al., Appl. Phys. Lett. 108, 261602 (2016)
