Seminar：Manipulating the electronic structure of spin-orbit coupled 4d-/5d- correlated electrons by tailoring superlattices

Time: 15:00-16:00pm, Thursday, Mar. 24^th, 2017

Location: Room 201, PhysicsBuilding, Yuquan Campus

D. W. Shen

Shanghai Institute of Microsystem And Information Technology

Abstract:

In this talk, I will introduce how to fabricate, characterize and manipulate the electronic structure of artificial 4d-/5d- transition metal oxide epitaxial films by the combo of oxide molecular beam epitaxy (OMBE), in-situ angle-resolved photoemission spectroscopy (ARPES) and X-ray magnetic circular dichroism (XMCD) techniques. We systematically studied the evolution of the low-energy electronic structure of SrRuO3 films with thickness thinning down to a nearly two-dimensional limit in a well-controlled way. Also, we have fabricated a series of high-quality [(SrIrO3)m/(SrTiO3)]n/SrTiO3(100) superlattices using the layer-by-layer  OMBE growth method, and consequently realized the emergent interfacial magnetism and metal-insulator transition (MIT) by artificial dimensionality control of iridates. The mechanism of this MIT and the elemental specificity of magnetism were then investigated by the in-situ ARPES system and XMCD, respectively. Our results could provide a comprehensive understanding of the phase transition in this spin-orbit Mott insulator and demonstrate a potential new route to control the electronic properties of nonpolar oxide heterostructures.