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Matthias Popp "The squeezable nanojunction technique - A multi-physics experiment bridging the gap from scanning probe microscopes to solid state devices?"

Feb 10
February 10, 2021 11:30 am - 12:00 pm
 

Guest talk

Matthias Popp, M.Sc, FAU

“The squeezable nanojunction technique – A multi-physics experiment
bridging the gap from scanning probe microscopes to solid state
devices?”


The basic principle of the squeezable nanojunction technique issimple to explain: Put two chips equipped with electrodes ontop of each other in a face-to-face configuration such that theelectrodes are initially separated by some hundrednanometers. By pushing the chips together with a controlledforce, the distance between the electrodes can be controlledreaching resolution on the atomic scale [1].Motivated by the goal of performing experiments onthermoelectricity in nanojunctions (single-molecule junctions[2]) with our graphene on silicon carbide (4H-SiC) materialsystem, we have built multiple versions of our experiment. Thelatest one provides the following features:

• Electrode materials ranging from evaporated metals, epitaxial graphene to doped SiC

• Independent temperature control of both chips and on-chip temperature measurement

• Atmospheric or high-vacuum environment• Temperatures from 20 K to 350 K (mounted on cryostat)

• Optical access due to the optical transparency of the SiC Chips via confocal microscope

Due to its potential capability of contacting various nanometer-sized objects such as thin polymer filmsor nanoparticles and investigating their combined electro-optical and thermo-electrical properties thisexperiment might be an interesting touching point between the I-MEET and the Chair for Applied Physics. 

[1] Popp, M. A., & Weber, H. B. (2019). An ultra-stable setup for measuring electrical andthermoelectrical properties of nanojunctions. Applied Physics Letters, 115(8), 083108.https://doi.org/10.1063/1.5116673 

[2] Popp, M. A., Erpenbeck, A., & Weber, H. B. (2021). Thermoelectricity of near-resonant tunneljunctions and their relation to Carnot efficiency. Scientific Reports, 11(1), 2031.https://doi.org/10.1038/s41598-021-81466-

3Link to explanatory youtube video with demonstration setup: 

– English: https://youtu.be/L3ZNoO_RO-w 

– German: https://youtu.be/q3J64yyErlM   

To join the meeting you can use https://fau.zoom.us/j/92092279001

For the password please contact Anastasia Barabash