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DF: Fachverband Dielektrische Festkörper

DF 17: Ferroics - Domains, Domain Walls and Skyrmions IV

DF 17.11: Vortrag

Donnerstag, 23. März 2017, 13:00–13:15, WIL B321

Reversibly tuning the domain wall conductivity in lithium niobate: from insulating to metallic-like and back again — •Christian Godau, Alexander Haußmann, and Lukas Eng — Institute of Applied Physics, Technische Universität Dresden, D-01062 Dresden, Germany

Ferroelectric domain walls (DWs) have become a central topic of research. Especially their tunable electronic properties stay in focus for the last couple of years, reporting domain wall conductivity (DWC) in both thin films [1] and single crystals [2]. Our recent research established DWC in lithium niobate (LNO) as promising building blocks for prospective electronic devices [3]; as theoretically predicted [4], DWs in fact become more conductive the larger their inclination angle is rendered. We will present here protocols how to fabricate such highly-conductive transport channels. In fact, our high-voltage treatment allows reversibly switching the conductive channels on and off, i.e. varying the inclination angle on will. This allows to fabricate a variety of novel nanoelectronic devices, for instance memory devices based on resistive switching [5] of DWC, or unidirectional / bidirectional diode/Ohmic-like 2-dimensional transport channels across wide band-gap semiconductors.

[1] J. Seidel et al., Nat. Mater. 8, 229 (2009) [2] T. Sluka et al., Nat. Comm. 4, 1808 (2013) [3] C. Godau et al., (2016) submitted [4] E. A. Eliseev et al., Phys. Rev. B 83, 235313 (2011) [5] R. Waser et al., Adv. Mater. 21, 2632 (2009)