Semiconductors with ultrathin layers successfully integrated with superconductors for the first time
In a groundbreaking development, researchers at the University of Basel have managed to equip an ultrathin semiconductor (molybdenum disulfide) with superconducting contacts. This achievement, published in the journal Nano Letters with the DOI 10.1021/acs.nanolett.1c00615, is expected to open new doors for the exploration of unique properties and physical phenomena.
The research team, led by Pablo Jarillo-Herrero, was the first to achieve this feat, publishing their experiment in 2012. The fabrication process involves a multi-step procedure, requiring meticulous avoidance of contaminations.
The semiconductor layer of molybdenum disulfide is protected by two thin layers of boron nitride. A thin layer of molybdenum rhenium is deposited as the contact material. The contacts in the semiconductor are etched vertically using electron-beam lithography and ion etching. A layer of graphene is added for electrical control.
In the semiconductor molybdenum disulfide, electrons perform a unique dance, a solo routine that also incorporates their magnetic moments. This is a phenomenon not typically observed in conventional semiconductors. In a superconductor, on the other hand, electrons arrange themselves into pairs, leading to the flow of electrical current without a resistance.
The contacts in this study retain their superconducting properties in strong magnetic fields, a significant advancement in the field. The electrical measurements at low temperatures required for superconductivity show the effects caused by the superconductor and indicate a strong coupling between the semiconductor layer and the superconductor.
Scientists worldwide are investigating how these thin semiconductors can be stacked to form new synthetic materials, known as van der Waals heterostructures. These heterostructures may have applications in quantum technology due to the complex quantum mechanical phenomena that take place in these semiconducting monolayers.
The researchers hope that the vertical contacts developed can be applied to a variety of semiconductors, potentially leading to new insights with exotic contact materials. The use of ultrathin semiconductors like molybdenum disulfide promises unique characteristics, such as the ability to control electric fields to influence the magnetic moments of electrons.
This breakthrough marks a significant step forward in the understanding and manipulation of superconductors and semiconductors, with potential applications in various fields, including quantum technology. The research team at the University of Basel continues to push the boundaries of what is possible in the realm of materials science.
Read also:
- Unveiling the Less-Discussed Disadvantages of Buds - Revealing the Silent Story
- Grid Risk Evaluation Strategy By NERC Outlined, Focusing on Potential Threats from Data Centers
- Kenya broadens economic zones featuring Olkaria's geothermal energy advantage
- Nutritional Healthcare: Linking Patients with Crucial Nourishment Through Medical Professionals
