Ralf Wunderlich

Wunderlich, Ralf

Dr. rer. nat.

Ralf Wunderlich

Akademischer Assistent

Raum: 484

+ 49 341 97 - 32706 / 32714

Hyperpolarization via Nitrogen Vacancy Centers

In my main research I utilize the spin dynamics of the negatively charged Nitrogen Vacancy center (NV) in diamond to polarize C-13 nuclei in a bulk single crystal. The NV center can be polarized in its m=0 ground state just by shining green light on it. I use the hyperfine coupling between the NV electron spin and the C-13 nuclei spin in the exited level anti crossing (ESLAC) at about 50 mT to swop the spin polarization to nearby C-13 nuclei (see Fig.). For this reason I designed a home-build low field irradiation unit and a shuttling system to the NMR measurement probe in a 7 T solenoid. With this technique I obtain a signal to noise ratio of SNR=31 in about two minutes which corresponds to a 23 h standard measurement without hyperpolarization.
In ongoing experiments I investigate the hyperfine coupling strengths with high resolution in magnetic field and try to extend this technique to diamond micro particles as well as to other material systems like silicon carbide.


Ralf Wunderlich, Jonas Kohlrautz, Bernd Abel, Jürgen Haase, Jan Meijer.
Investigation of room temperature multispin-assisted bulk diamond 13C hyperpolarization at low magnetic fields.
arXiv: 1802.08319 [cond-mat.mes-hall].
J. Phys.: Condens. Matter 30, 305803:1-6 (2018).
DOI: 10.1088/1361-648X/aacc32.

J. Barzola-Quiquia, T. Lühmann, R. Wunderlich, M. Stiller, M. Zoraghi, J. Meijer, P. Esquinazi, J. Böttner, I. Estrela-Lopis.
Fabrication and electrical transport properties of embedded graphite microwires in a diamond matrix.
J. Phys. D: Appl. Phys. 50, 145301:1-7 (2017).
DOI: 10.1088/1361-6463/aa6013.

Christoph Schreyvogel, Vladimir Polyakov, Sina Burk, Helmut Fedder, Andrej Denisenko, Felipe Fávaro de Oliveira, Ralf Wunderlich, Jan Meijer, Verena Zuerbig, Jörg Wrachtrup, Christoph E. Nebel.
Active and fast charge-state switching of single NV centres in diamond by in-plane Al-Schottky junctions.
Beilstein J. Nanotechnol. 7, 1727-1735 (2016).
DOI: 10.3762/bjnano.7.165.

C. Bundesmann, R. Feder, R. Wunderlich, U. Teschner, M. Grundmann, H. Neumann.
Ion beam sputter deposition of Ge films: Influence of process parameters on film properties.
Thin Solid Films 589, 487-492 (2015).
DOI: 10.1016/j.tsf.2015.06.017.

Christoph Eichhorn, Darina Manova, René Feder, Ralf Wunderlich, Christel Nömayr, Claus G. Zimmermann, Horst Neumann.
Sputter yield measurements of thin foils using scanning transmission ion microscopy.
Eur. Phys. J. D 69, 19:1-7 (2015).
DOI: 10.1140/epjd/e2014-50552-1.

R. Wunderlich, C. Chiliotte, G. Bridoux, T. Maity, Ö. Kocabiyik, A. Setzer, M. Ziese, P. Esquinazi.
Structural, magnetic and electric properties of HoMnO3 films on SrTiO3(001).
J. Magn. Magn. Mater. 324, 460-465 (2012).
DOI: 10.1016/j.jmmm.2011.08.021

M. Ziese, A. Setzer, R. Wunderlich, C. Zandalazini, P. Esquinazi.
Angular dependence of the magnetoelectric effect in orthorhombic HoMnO3 films.
Phys. Rev. B 84, 214424 (2011).
DOI: 10.1103/PhysRevB.84.214424

letzte Änderung: 15.11.2019


Abteilung Angewandte Quantensysteme
Universität Leipzig
Fakultät für Physik und Geowissenschaften
Felix-Bloch-Institut für Festkörperphysik
Linnéstraße 5
04103 Leipzig

Telefon: +49 341 97 - 32700
Telefax: +49 341 97 - 32748