01 March

Laser-Light for Epitaxy

Monday 01 March 2021, 12:00pm

Online ICMAB Periodical Lecture - Register HERE

By Hans Boschker, Max Planck Institute for Solid State Research, Germany 

Abstract: Complex-oxide heterostructures are a leading example of quantum-matter heterostructures that open a new arena of solid-state physics. For the scientific development of this field and for a range of potential applications, the growth of high-purity heterostructures is required. We have developed a new thin-film deposition technique that is especially suited to the growth of oxide heterostructures with atomic precision. Thermal laser epitaxy uses chemical elements as sources which are evaporated with continuous-wave lasers. The lasers’ virtually arbitrary power density allows for the evaporation of almost all elements of the periodic table in the same setup. This is demonstrated by showing elemental metal films of a large range of elements; from high-vapour-pressure elements like S and Bi to low-vapour-pressure elements like W and Ta.

Iwill discuss the benefits of thermal laser epitaxy for high-purity deposition of complex-oxide materials and heterostructures with almost all elements from the periodic table. Furthermore, I will present results of a new substrate heater that is based on a ~10 µm laser. This laser light is directly absorbed by oxide crystals and therefore allows for a heating system that is ultra-clean, has very fast ramp rates and can reach extremely high temperatures.

Hosted by Gervasi Herranz, MULFOX group, ICMAB-CSIC