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Tuning the Dimensionality of Strongly Correlated Materials between 1D and 2D

Ambrose Seo

December 14(Thu) - December 14(Thu), 2017

Tuning the Dimensionality of Strongly Correlated Materials between 1D and 2D

 

Ambrose Seo

Associate Professor
Department of Physics and Astronomy
University of Kentucky
E-mail:
a.seo@uky.edu

 

Tuning the dimensionality of a system offers a useful tool for realizing new quantum phenomena associated with critical phase transitions and topological properties.  However, only a few naturally occurring materials with tunable, intrinsic 1D and 2D structures are available for experimental studies.  In this talk, I will present a new approach of synthesizing 1D – 2D quantum systems by creating dimensionally-confined stripe-superlattices from in-plane oriented layered materials.  For example, we have demonstrated this method to synthesize 1D – 2D IrO2 stripes using a-axis oriented superlattices of Sr2IrO4 and insulating (La,Sr)GaO4, both are of the K2NiF4 symmetry [1].  The dimensional confinement of the superlattices has been confirmed by structural characterizations.  Optical spectroscopy shows clear anisotropic characteristics and dimensional electronic confinement of the spin-orbit coupled Jeff = 1/2 band.  Spin and orbital excitations observed in resonant inelastic x-ray scattering spectra suggest larger exchange interactions and more confined orbital excitations in the 1D IrO2 stripes as compared to its 2D counterpart.  The observed electronic confinement and localized spin-structure are quite consistent with density functional theory calculations.  This method of tuning the dimensionality between 1D and 2D via stripe-superlattices is a viable technique for obtaining dimensionality-induced quantum phase transitions in strongly correlated materials.

 

[1] J. H. Gruenewald et al., Adv. Mater. 29, 163798 (2017).

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IBS Institude for Basic Science Center for Artificial Low
Dimensional Electronic Systems

IBS POSTECH Campus 79, Jigok-ro 127beon-gil, Namgu, Pohang, Korea, (37673)

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