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X-ray vision of spins, charges and orbitals for understanding emergent electronic states in complex oxides

Date: 2018-08-20
Time: 14:00
Venue: 物理所M253
Speaker: Mark P. M. Dean

Brookhaven National Laboratory

Abstract: The charge, spin and orbital degrees of freedom play a crucial role in determining the remarkable properties of transition metal oxide materials, but probing these degrees of freedom is often challenging. In this talk, I will describe how resonant inelastic x-ray scattering (RIXS) opens up important new possibilities for measuring these degrees of freedom even in extreme cases such as atomically thin heterostructures and ultra-fast transient states. This includes observing precursor charge correlations in cuprates [1], determining how orbitals are modified within LaNiO3-based heterostructures [2] and characterizing the spin behavior within the transient state of photo-doped Sr2IrO4 [3]. 

1. H. Miao et al., Proc. Natl. Acad. Sci. U.S.A 114, 12430–12435 (2017); H. Miao et al., H. Miao et al., Phys. Rev. X 8, 011008 (2018)
2. G. Fabbris et al., Phys. Rev. Lett. 117, 147401 (2016); G. Fabbris et al., Phys. Rev. Lett. 118, 156402 (2017)
3. M. P. M. Dean et al., Nature Materials 15, 601-605 (2016) 

Mark Dean is a Physicist in the X-Ray Scattering Group at Brookhaven National Laboratory, USA. His research program is centered on resonant elastic and inelastic x-ray scattering studies of quantum materials and is supported by a Department of Energy Early Career Award. Mark is a member of the Editorial Board for Physical Review X and chair of the National Synchrotron Light Source II Users' Committee.