Hubert J. Krenner, Universität Augsburg,New twists for nanoquakes on a chip – Emerging applications of surface acoustic waves to probe and control quantum nanosystems

Speaker

Hubert J. Krenner
Institut für Physik
Universität Augsburg

Bio

Hubert Krenner received his diploma (2002) and PhD (2006) in Physics from the Technical University Munich, working in the groups of Gerhard Abstreiter and Jonathan Finley at the Walter Schottky Institut. Afterwards he joined the group of Pierre Petroff at the Materials Department at UC Santa Barbara as a Feodor Lynen Postdoctoral Fellow of the Alexander von Humboldt Foundation from 2006 to 2008. In 2008, he moved back to Germany where he joined the chair of Achim Wixforth at Augsburg University. In 2011 he received an Emmy Noether Independent Research Group Award and was appointed Professor of Experimental Physics at Augsburg University in 2014. His research is focused on the unified control of light sound and matter in hybrid quantum nanosystem. Special focus is set on the optomechanical control of semiconductor quantum dots and their coupling to nanophotonic systems and the acoustic control and spectroscopy of emerging nanoscale materials. Hubert Krenner is member of Collaboratives Research Center “Solid State Quantum Information Processing”, the Center of NanoScience Munich, the Cluster of Excellence “Nanosystems Initiative Munich” (NIM) and served as the coordinator of the Marie Sklodowska-Curie ITN “SAWtrain.

Abstract

Over the past decades, innovation for radically new devices was mostly driven by controlling electrons and photons: microelectronics (electrons) and photonics (photons) revolutionized our everyday life. Today, Surface Acoustic Waves (SAWs) are one of the only very few phononic technologies of industrial relevance. Acoustic radio frequency filters, for instance, are integral parts of wireless devices and SAWs find applications in life sciences and microfluidics for sensing and mixing of tiny amounts of liquids (1). In fundamental and applied research, these “nanoquakes on a chip” provide a particularly useful and versatile tool for massively parallel addressing a broad variety of nanosystems at radio frequencies via strong acousto-mechanical and acousto-electric couplings. In this presentation, I highlight our recent advances in the control and probing of fundamental physical properties in electrically and optically active hybrid nanosystems. Specific examples include the deliberate coherent control of optically active quantum dots and their coupling to light by the SAW’s coherent acoustic field (2,3) in monolithic III-V semiconductors) and heterointegrated semiconductor-LiNbO3 systems (4,5), and the contact-free measurement of electrical transport properties in two-dimensional materials (7). References (1) P. Delsing et al., “The 2019 surface acoustic wave roadmap”, J. Phys. D: Appl. Phys. 52, 353001 (2019) (2) M. Weiß and H. J. Krenner, “Interfacing quantum emitters with propagating surface acoustic waves”, J. Phys. D: Appl. Phys. 51, 373001 (2018) – Topical Review (3) F. J. R. Schülein et al., “Fourier synthesis of radiofrequency nanomechanical pulses with different shapes” Nat. Nanotechnol. 10, 512–516 (2015). (4) J. Pustiowski et al. “Independent dynamic acousto-mechanical and electrostatic control of individual quantum dots in a LiNbO3-GaAs hybrid” Appl. Phys. Lett. 106, 013107 (2015). (5) E. D. S. Nysten et al. “Multi-harmonic quantum dot optomechanics in fused LiNbO 3 –(Al)GaAs hybrids” J. Phys. D. Appl. Phys. 50, 43LT01 (2017). (6) E. Preciado et al., “Scalable Fabrication of a Hybrid Field-Effect and Acousto-Electric Device by Direct Growth of Monolayer MoS2/LiNbO3”, Nat. Comm. 6, 8593 (2015)