Published on November 16, 2022 Updated on November 22, 2022

Gavin BELL

BELL
BELL
University of Warwick, United Kingdom.
Visiting Scholar invited by research center LPMS.
Stays from November 30 to December 10, 2022.
Curriculum Vitae

Molecular beam epitaxy for quantum materials
Enormous progress is made in developing new quantum materials by growing bulk crystals, cleaving them in vacuum and performing a range of photoemission measurements. However, many spintronic and quantum materials must be in thin film form for practical applications. Furthermore, their properties as ultra-thin films may be very different from the bulk due to quantum confinement or interaction between “top” and “bottom” surface states. Of particular interest are topologically non-trivial states localised at the surfaces and interfaces of certain materials. Molecular beam epitaxy (MBE) is a flexible method for growing thin film materials and, as an ultra-high vacuum method, can be combined with surface-sensitive analytical methods. We are investigating quantum materials such as InBi and SrMnSb2 grown by MBE, using advanced analytical methods to study the electronic band structure, namely angle-resolved photoemission spectroscopy (ARPES). These materials are challenging to grow by MBE and can be highly sensitive to atmospheric contamination, so extra care must be taken to thoroughly characterise the thin films and protect them from degradation before analysis by ARPES. They are grown on standard semiconductor substrates in order to maximise their future potential in next-generation quantum devices.

Research project