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06. April 2023

Novel epitaxy equipment for the growth of nuclear spin-free quantum materials at the IKZ

The equipment was commissioned to push the limits of material properties for quantum technologies

New molecular beam epitaxy equipment and the researchers © IKZ
Newly commissioned molecular beam epitaxy equipment for the growth of ²⁸Si and ⁷⁶Ge heterostructures, together with the SiGe-based Quantum Materials group: Dr. Kevin Peter Gradwohl (left), Maximilian Oezkent, and Yujia Liu (right) © IKZ

Silicon (Si) and germanium (Ge) are the workhorses of modern semiconductor technology, where decades of science and technology development yielded advanced device fabrication of extremely pure materials. This tremendous know-how, together with the possibility to produce isotopically enriched Si and Ge completely free of isotopes with nuclear spin, make them also extremely interesting for application in quantum technologies [1,2].

Nuclear spins in Si and Ge interfere with quantum states, and their absence promises useful quantum technologies within immediate reach. The IKZ researches the processing, purification, and growth of such nuclear spin-free Si and Ge volume crystals for decades, and became a world-leading competence center in the field. These unique materials are now utilized as source material in a recently commissioned molecular beam epitaxy (MBE) equipment for the development of novel quantum materials. Here, the enriched Si and Ge are evaporated in ultra-high vacuum conditions with less than a trillionth of an atmosphere (10-11 mbar) to grow thin films on Si wafers.

The unique selling point of this equipment is the utilization of solely isotopically enriched Si and Ge – avoiding any material with natural isotopes – making it the first and only nuclear spin-free MBE in the world. The machine constitutes an investment of 1.2 million euro in total, and involved a planning and construction period of over three years. With the commissioning of this machine and the founding of a new junior research group ‘SiGe-based Quantum Materials and Heterostructures’, the IKZ positions itself strategically for the long term development and benchmarking of a new generation of materials to meet the demands for novel quantum applications. IKZ will offer its isotopically enriched SiGe quantum heterostructure expertise for collaborations in common R & D projects with interested partners; it will also be possible in future to purchase such materials systems by IKZ Service & Transfer unit on the basis of full cost accounting.

[1] Liu, Yujia, et al. "Role of critical thickness in SiGe/Si/SiGe heterostructure design for qubits." Journal of Applied Physics 132.8 (2022): 085302.
DOI:10.1063/5.0101753

[2] Gradwohl, Kevin-P., et al. "Strain relaxation of Si/SiGe heterostrucutres by a geometric Monte Carlo approach." physica status solidi, Rapid Research Letters (2023): 2200398.
DOI:10.1002/pssr.202200398
 

Contact:

Dr. Kevin-Peter Gradwohl
Junior Research Group "SiGe-based Quantum Materials and Heterostructures"
Leibniz-Institut für Kristallzüchtung in the Forschungsverbund Berlin e.V.
Phone +49 30 6392 3021
Email kevin-peter.gradwohl(at)ikz-berlin.de

 

Press release IKZ, 6 April 2023

Research Microsystems / Materials

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The development of the Science and Technology Park Berlin Adlershof was and is co-financed by the European Union namely by EFRE. This concerns infrastructure development like construction of technology centres. Furthermore EFRE is used for international projects.

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