Contact

Spokesperson:
Prof. Dr. Sibylle Gemming

Phone: +49 (0) 351 260-2470
Email: s.gemming.at.hzdr.de

Deputy Spokesperson:
Dr. Heidemarie Schmidt

Phone: +49 (0) 371 531-32481
Email: Heidemarie.Schmidt.at.etit.tu-chemnitz.de

Coordinator:
Dr. Peter Zahn

Phone: +49 (0) 351 260-3121
Email: p.zahn.at.hzdr.de

News and Events

2016-09-25/27
MEMRIOX International Workshop, Berghotel Bastei, DE - Best Poster Prize Winner: Jura Rensberg (FSU Jena)

2016-11-03
Nicola Spaldin: 2017 L’Oréal-UNESCO “For Women in Science” Laureate - Congrats, ETH Zurich press release

2016-11-30
Heidemarie Schmidt: ATTRACT @ Fraunhofer ENAS Chemnitz, More info

2017-06-26
13. Treffen Arbeitskreis Materialien für nichtflüchtige Speicher , Universität Mainz, DE,
Organization: Thomas Mikolajick (NaMLab)

www.memristor.org

Acknowledgement 

The project is funded by the Initiative and Networking Fund of the Helmholtz Association (VH-VI-422).

Helmholtz-Logo weiß auf blau

MEMRIOX Research Highlights

A complete list of publications can be found here.

Rensberg, J.; Zhang, S.; Zhou, Y.; Mcleod, A. S.; Schwarz, C.; Goldflam, M.; Liu, M.; Kerbusch, J.; Nawrodt, R.; Ramanathan, S.; Basov, D. N.; Capasso, F.; Ronning, C.; Kats, M.,
Active optical metasurfaces based on defect-engineered phase-transition materials, Nano Lett. 16, 1050–1055 (2016)

Rensberg2016, Nano Lett. 16, 1050, illustr. abstract
Spatially selective defect engineering on the nanometer scale can transform phase transition materials into optical metasurfaces. Using ion irradiation through nanometer-scale masks, we selectively defect-engineered the insulator-metal transition of vanadium dioxide, a prototypical correlated phase-transition material whose optical properties change dramatically depending on its state. Using this robust technique, we demonstrated several optical metasurfaces, including tunable absorbers with artificially induced phase coexistence and tunable polarizers based on thermally triggered dichroism. Spatially selective nanoscale defect engineering represents a new paradigm for active photonic structures and devices. [From Nano Lett. 16, 1050 (2016)]

M.K. Liu, M. Wagner, E. Abreu, S. Kittiwatanakul, A. McLeod, Z. Fei, M. Goldflam, S. Dai, M.M. Fogler, J. Lu, S.A. Wolf, R.D. Averitt, and D.N. Basov, Anisotropic Electronic State via Spontaneous Phase Separation in Strained Vanadium Dioxide Films, Phys. Rev. Lett. 111, 096602 (2013), PDF (Internal Use)

Liu2013, PRL 111, 096602, Fig.1
(a) Near-field IR images illustrating three distinct stages of the insulator-to-metal phase transition as described in the text. (b) Temperature-dependent THz conductivity (σTHz) along the [1σ10]R axis (squares) and along the [001]R axis (circles). Red (gray) and blue (black) arrows reflect directions of temperature change. Inset: crystal structure of VO2 in low temperature monoclinic [green (black) spheres] and high temperature rutile [orange (gray) spheres] phases. The shaded plane coincides with the surface of our sample film. [From Phys. Rev. Lett. 111, 096602 (2013)]

F. Gunkel, K. Skaja, A. Shkabko, R. Dittmann, S. Hoffmann-Eifert, and R. Waser, Stoichiometry dependence and thermal stability of conducting NdGaO3/SrTiO3 heterointerfaces, Appl. Phys. Lett. 102, 071601 (2013)

Gunkel2013, APL 101, 071601, Fig.3
High temperature equilibrium conductance (HTEC) characteristics of the NGO/STO heterostructure (filled symbols); (a) a thermally stable interface contribution is found for 850 K– 1000 K; open symbols and dashed line correspond to the bare STO substrate (950 K); (b) comparison of the HTEC of the NGO/STO heterostructure at 950K before (filled symbols) and after (open symbols) additional measurement cycles at 1050K and 1100 K; the dashed line corresponds to STO single crystal data. (Inset: XRD data before and after the HTEC measurement.) [From Appl. Phys. Lett. 101, 071601, Fig.3]

J. Hanzig, M. Zschornak, F. Hanzig, E. Mehner, H. Stöcker, B. Abendroth, C. Röder, A. Talkenberger, G. Schreiber, D. Rafaja, S. Gemming, and D.C. Meyer, Migration-induced field-stabilized polar phase in strontium titanate single crystals at room temperature, Phys. Rev. B 88, 024104 (2013)

Hanzig2013, PRB 88, 024104, Fig.7
Formation of the migration-induced field stabilized polar phase in SrTiO3 single crystals. (a) Initial state (E = 0): oxygen vacancies initiate atomic displacements. (b) Applying an electric field (E > 0): additional displacements of nearest atoms in the vicinity of an oxygen vacancy break the inversion symmetry. (c) Vacancy migration leaves a point-defect-free elongated unit cell (see orange circle) with remaining atomic displacements. (d) Traces of MFP phase are formed in turns of vacancy migration. [From Phys. Rev. B 88, 024104, Fig.7]

Nan Du, Yao Shuai, Wenbo Luo, Christian Mayr, René Schüffny, Oliver G. Schmidt, and Heidemarie Schmidt,
Practical guide for validated memristance measurements,
Rev. Sci. Instrum. 86, 023903 (2013), PDF (internal use)