6533b7d8fe1ef96bd126a464
RESEARCH PRODUCT
Charge compensation by long-period reconstruction in strongly polar lithium niobate surfaces
Hirofumi YamadaR. HölscherSimone SannaSebastian RodeWolf Gero SchmidtKei KobayashiAngelika KühnleStefanie KlassenChristoph Marutschkesubject
Physicsbusiness.industryAnnealing (metallurgy)Atomic force microscopyLithium niobateCondensed Matter Physics530Surface energyElectronic Optical and Magnetic Materialschemistry.chemical_compoundOpticschemistryLong periodPolarCharge compensationSurface chargeAtomic physicsbusinessdescription
The microscopic structure of the polar (000$\overline{1}$) and (0001) surfaces of lithium niobate is investigated by atomic-resolution frequency modulation atomic force microscopy and first-principles calculations. It is found that the surface reconstructs at annealing temperatures sufficiently high to drive off external adsorbates. In particular a ($\sqrt{7}\ifmmode\times\else\texttimes\fi{}\sqrt{7}$)$R$19.1${}^{\ensuremath{\circ}}$ reconstruction is found for the (000$\overline{1}$) surface. Density-functional theory calculations show that---apart from the $(\sqrt{7}\ifmmode\times\else\texttimes\fi{}\sqrt{7})$---a series of adatom-induced surface reconstructions exist that lower the surface energy and reduce the surface charge.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-09-16 |