Semiconducting monolayer and superconductor brought together at last

For the first time, researchers at the University of Basel in Switzerland have equipped an ultrathin semiconductor with superconducting contacts. These extremely thin materials with novel electronic and optical properties could pave the way for previously unimagined applications. Combined with superconductors, they are expected to give rise to new quantum phenomena and to find use in quantum technology.

Whether in smartphones, televisions or building technology, semiconductors play a central role in electronics and therefore in our everyday lives. In contrast to metals, it is possible to adjust their electrical conductivity by applying a voltage, and hence to switch the current flow on and off.

With a view to future applications in electronics and quantum technology, researchers are focusing on the development of new components that consist of a single layer (monolayer) of a semiconducting material. Some naturally occurring materials with semiconducting properties feature monolayers of this kind, stacked to form a three-dimensional crystal. In the laboratory, researchers can separate these layers – which are no thicker than a single molecule – and use them to build electronic components.

These ultrathin semiconductors promise to deliver unique characteristics that are otherwise difficult to control, such as the use of electric fields to influence the magnetic moments of electrons. In addition, complex quantum mechanical phenomena take place in these semiconducting monolayers that may have applications in quantum technology.

Scientists worldwide are investigating how these thin semiconductors can be stacked to form new synthetic materials, known as van der Waals heterostructures. Until now, however, they have not managed to combine such a monolayer with superconducting contacts, which would allow them to dig deeper into the properties and peculiarities of the new materials.

A team of physicists, led by Andreas Baumgartner in the research group of Christian Schönenberger at the Swiss Nanoscience Institute and the Department of Physics at the University of Basel, has now, for the first time, fitted a monolayer of the semiconductor molybdenum disulfide with superconducting contacts.

The reason why this combination of semiconductor and superconductor is so interesting is that the researchers expect components of this kind to exhibit new properties and physical phenomena. "In a superconductor, the electrons arrange themselves into pairs, like partners in a dance – with weird and wonderful consequences, such as the flow of the electrical current without a resistance," explains Baumgartner, the project manager of the study. "In the semiconductor molybdenum disulfide, on the other hand, the electrons perform a completely different dance, a strange solo routine that also incorporates their magnetic moments. Now we would like to find out which new and exotic dances the electrons agree upon if we combine these materials."

The electrical measurements at the low temperatures required for superconductivity – just above absolute zero (-273.15°C) – show clearly the effects caused by the superconductor; for example, at certain energies, single electrons are no longer allowed. Moreover, the researchers found indications of a strong coupling between the semiconductor layer and the superconductor.

"Strong coupling is a key element in the new and exciting physical phenomena that we expect to see in such van der Waals heterostructures, but were never able to demonstrate," says Mehdi Ramezani, lead author of a paper on this work in Nano Letters.

"And, of course, we always hope for new applications in electronics and quantum technology," says Baumgartner. "In principle, the vertical contacts we've developed for the semiconductor layers can be applied to a large number of semiconductors. Our measurements show that these hybrid monolayer semiconductor components are indeed possible – perhaps even with other, more exotic contact materials that would pave the way for further insights."

The fabrication of this new component, as a type of sandwich made of different materials, requires a large number of different steps. In each step, it is important to avoid contamination, as this would seriously impair the transport of electrical charges.

To protect the semiconductor, the researchers pack a monolayer of molybdenum disulfide between two thin layers of boron nitride, through which they have previously etched the contacts vertically using electron-beam lithography and ion etching. They then deposit a thin layer of molybdenum rhenium as a contact material – a material that retains its superconducting properties even in the presence of strong magnetic fields.

Working under a protective nitrogen atmosphere in a glove box, the researchers stack the boron nitride layer onto the molybdenum disulfide layer and combine the underside with a further layer of boron nitride, as well as a layer of graphene, for electrical control. The researchers then place this elaborate van der Waals heterostructure on top of a silicon/silicon-dioxide wafer.

This story is adapted from material from the University of Basel, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.