Jul 14

Back making rolled-up tubes

We are back to make rolled-up InGaAs/GaAs nano- and microtubes. We stopped doing the process for more than a year, but now is the time to strongly restart the activity.

The light microscopy image shows one of our first process. The MBE grown sample coming from our machine rolls nicely, but we have to optimize our process to place them on the sample surface and to control the roll-up.

In the past, this was not to hard and I hope, we be back to the excellent structures, we fabricated before, very soon.

These structures are related to our ongoing FAPESP project and we would always welcome another helping hand in the whole thing. We are still interested in doing hybrid radial superlattices and try to explore further functionality of the tubes.

Jul 07

AFM workshop at the LNNano

Scanning near field optical (SNOM) microscopy image of a graphene flak obtained during the AFM workshop at the LNNano using the NanoIR2-s system of the facility. We are back to the business of imaging garphene and restart this research line here as well as in collaboration with the CNPEM.


We had a lot of fun during the workshop and the chance to teach AFM and related techniques (I gave 9 times a course on EFM/KFM). Furthermore, a lot of  interaction with the user of the AFM facilities, I am still in collaboration with, was happening showing that we have an active Brazilian AFM community. The image above shows, how important state of the art instrumentation is, but also which kind of nice images we can obtained in science.


Jun 29

Beware the impact factor

I just read an interesting interview in a German Online magazine with Noble prize winner Randy Schekman. He warns to out to much value into the impact factor of magazines like "Science" and "Nature" - indeed he claims, they not helping science to progress, but give rise to fashionable and not-solid research.

I agree with him: we have to come up with better systems to evaluate the quality, the importance and relevance of publications and science we do. I just have no idea, what is a better alternative at the current point.

Jun 23

II LNNano AFM Workshop

WE will have our II LNNano AFM Workshop from the 05. to the 07. July at the LNNano. We had a tremendous feedback to the event. I am looking forward to do the theoretical course and will administrate one of the practical parts of the Workshop.

The LCS group does a hard work making this happening.


Jun 13

Universal 01/2016 - Faixa B

After long waiting, we got the acceptance news for our Proposal of last year submitted in the Universal 01/2016 - Faixa B. We hope to start the project soon as it will supports our research on overgrowth of membranes and rolled-up nanotubes.

The project tile is: " Nanoestruturas semicondutoras crescidas epitaxialmente sobre membranas para aplicações em pesquisa básica e dispositivos optoeletronicos" .

Jun 09

Speaking at the 18th BWSP

I will have the pleasure to give a tutorial at the 18th Brazilian Workshop on Semiconductor Physics (BWSP-2017) (Aug. 14-18 - 2017 - Maresias, São Paulo, Brazil) talking about MBE growth and heterostructures. The BWSP has a long tradition and always been a nice place to exchange ideas and meet people. Hope to see you there and share your research with us.

Jun 08

New at the IFGW

In May 2017 I entered into the Applied Physics Department (DFA) of the Physics Institute (IFGW) of Unicamp.