Nanoelectronics

Semiconductor-based technologies are evolving rapidly, with quantum effects playing an increasingly important role in data communication, processing, and storage. As interest in quantum computing, secure data transmission, and other quantum technologies grows, understanding and controlling quantum mechanical properties such as electron and spin transport, resonant tunneling, and coherent coupling of quantum states becomes essential. These effects hold the potential to enhance electronic functionalities and enable new device concepts.

The Nanoelectronics Core Research Area explores quantum effects and transport in artificial hetero- and nanostructures, which we typically fabricate by electron-beam lithography. We are interested in the fundamental electronic dynamics of quantum circuits, which we study by transport spectroscopy at low temperatures and in high magnetic fields. A present focus is thereby the interaction between electrons or holes and vibrational eigenstates of the crystal (phonons) as a means of coherent coupling between solid state quantum bits.

Our research contributes to the development of next-generation electronic and quantum technologies by fostering our fundamental understanding of the underlying physics. While many challenges remain, the exploration of quantum mechanical phenomena in nanoscale structures holds promise for future applications in emerging computational paradigms.

2025

1. Transition from edge- to bulk-currents in the quantum Hall regime
   Authors: Sirt, S. and Umansky, V. Y. and Siddiki, A. and Ludwig, S.
   Source: Appl. Phys. Lett., 126 (24): 243101, (2025)
   DOI: 10.1063/5.0275599

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