Alexander Holleitner

Technical University of Munich

Alexander Holleitner

Ultrafast & nanoscale optoelectronics of 2D materials

 

A.W. Holleitner

Walter Schottky Institut and Physics Department,

Technical University of Munich (TUM), Germany.

 

As electronic circuits reach the nanometer length scale, it is essential to study the charge and heat dynamics in nanomaterials, such as graphene and transition metal dichalcogenides, which can be integrated into future information circuits. We apply an ultrafast on-chip photocurrent spectroscopy to detect the electron dynamics in nanoscale circuits based on 2D materials with a sub-picosecond time-resolution [1,2,3]. The ultrafast detection gives access to the ballistic time-of-flight of photogenerated charge carriers as well as to non-equilibrium thermo-electric currents and non-radiative energy transfer processes [4,5,6]. In my presentation, I will give an introduction to the experimental scheme and to ultrafast electron dynamics inherent to the different nano-morphologies and circuits.

 

Reference                                                                                                                         

[1]   L. Prechtel, et al. Nature Comm. 3, 646 (2012).

[2]   C. Kastl, et al. Nature Comm. 6, 6617 (2015).

[3]   C. Kastl, et al. IEEE J. Sel. Topics Quantum Electron. DOI: 10.1109/JSTQE.2016.2641343 (2017).

[4]   A. Brenneis, et al. Nature Nano. 10, 135 (2015).

[5]   A. Brenneis, et al. Nature Sci Rep 6, 35654 (2016).

[6]   P. Seifert, et al. Nano Letters DOI: 10.1021/acs.nanolett.6b04312 (2017).

 

 

Alexander Holleitners research is on the fabrication and characterization of nanoscale materials and devices ranging from quantum systems, atom-scale 2D materials to in/organic hybrid materials with a particular emphasis on non-equilibrium optoelectronic phenomena. It covers fundamental quantum processes up to ultrafast charge and heat dynamics for photovoltaic and information technology applications. He scientifically directs the shared facilities of the Center of Nanotechnology and Nanomaterials (ZNN/WSI) of the Technical University of Munich (TUM), which provides state-of-the-art lithography and nanofabrication methods to researchers on campus and from the scientific Munich area.

Alexander Holleitner received a Dipl. Phys. Univ. and a PhD at the Ludwig-Maximilians-Universität (LMU), Germany, in 1999 and 2002, respectively. His PhD work focused on coherent states in semiconductor quantum dots. He then worked as a post-doc at the University of California, Santa Barbara (2003-2005), where he focused on semiconductor spintronics. In 2006, he joined the Center for NanoSciences (CeNS) at the LMU as a Junior Professor for Nanosciences. In 2007, he got appointed as an Associate Professor to the Walter Schottky Institut and the Physics Department of the Technical University of Munich (TUM). He is a co-founder and head of the Center for Nanotechnology and Nanomaterials (ZNN) at TUM.

 

 

Web: http://www.professoren.tum.de/en/holleitner-alexander/

 

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