Talk Details:
Quantum dots (QDs) are conducting regions that can localize a few charge carriers, with an energy spectrum dominated by Coulomb repulsion. QDs can range in size from a few hundred nanometers down to a single molecule, depending on their physical realization — whether in two-dimensional materials, nanowires, or molecular systems. In this talk, Prof. Steinberg will describe his work on a new type of atomically-sized QD realized in defects within ultrathin two-dimensional insulators. These defect-dots are found in layered materials such as hexagonal Boron Nitride (hBN), studied by assembling stacked devices. By using graphene electrodes, they can electronically couple to the QD, while externally tuning the QD energy by exploiting the penetration of the electric field through graphene.
The structure of these devices places defect QDs at atomic distances from conductors on both sides, opening new opportunities for sensitive measurements — including using QDs as highly sensitive spectrometers or as single-electron transistors uniquely sensitive to local electric fields at the nanometer scale. Prof. Steinberg will also discuss future prospects for using defect QDs as quantum sensors.
Speaker Details:
Prof. Steinberg is a Full Professor at the Racah Institute of Physics since 2013. His research focuses on electronic and optical effects in two-dimensional materials, fabricating intricate electronic devices by assembling layers as thin as a single atom. His interests include fundamental problems in superconductivity, the role of spins and magnetism in superconducting phases, and quantum information manipulation. He has pioneered the development of novel atomic-scale transistors used as ultra-sensitive local probes, as well as new sensors for anti-matter particles. His research is supported by competitive grants from the ERC, ISF, DFG, MOST, the Israeli Atomic Energy Commission, and others.
Since 2023, Prof. Steinberg has served as the academic director of the Hebrew University Center for Nano Science and Technology, overseeing critical research infrastructure used by over 130 research groups and high-tech companies across Israel.