Constructing oxide interfaces and heterostructures by atomic layer-by-layer laser molecular beam epitaxy [article]

Qingyu Lei, Maryam Golalikhani, Bruce A. Davidson, Guozhen Liu, D. G. Schlom, Qiao Qiao, Yimei Zhu, Ravini U. Chandrasena, Weibing Yang, Alexander X. Gray, Elke Arenholz, Andrew K. Farrar (+4 others)
<span title="2016-10-21">2016</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Advancements in nanoscale engineering of oxide interfaces and heterostructures have led to discoveries of emergent phenomena and new artificial materials. Combining the strengths of reactive molecular-beam epitaxy and pulsed-laser deposition, we show here, with examples of Sr1+xTi1-xO3+delta, Ruddlesden-Popper phase Lan+1NinO3n+1 (n = 4), and LaAl1+yO3(1+0.5y)/SrTiO3 interfaces, that atomic layer-by-layer laser molecular-beam epitaxy (ALL-Laser MBE) significantly advances the state of the art
more &raquo; ... constructing oxide materials with atomic layer precision and control over stoichiometry. With ALL-Laser MBE we have produced conducting LaAlO3/SrTiO3 interfaces at high oxygen pressures that show no evidence of oxygen vacancies, a capability not accessible by existing techniques. The carrier density of the interfacial two-dimensional electron gas thus obtained agrees quantitatively with the electronic reconstruction mechanism.
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