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Wednesday, August 13 • 08:30 - 09:50
Plenary III

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Plenary: Masashi Kawasaki
Quantum Transport at Oxide Interfaces

We present our recent discovery of 3/2 and other fractional states with even denominator in an oxide heterostructure of MgZnO/ZnO. In this system, the discontinuity in spontaneous electric polarization of polar crystals accumulates two-dimensional electron gas at the interface. Progress in thin film technology enabled us to attain a mobility over 700,000 cm2/Vs [1]. Due to much large values of electron mass (0.3m0) and spin susceptibility (g = 1.9) in ZnO compared with those in GaAs (0.07m0 and -0.44), numbers of intriguing effects are realized. In the presentation, we describe that the strong correlation effect further enhances the g value to realize a cross-over of Zeeman and orbital energies, giving a birth of 3/2 state in this system. In the talk, we overview our activity on ZnO for the last decade and highlight the potential and richness of oxide interface research.

[1] For a review, Y. Kozuka, A. Tsukazaki, M. Kawasaki, "Challenges and opportunities of ZnO-related single crystalline heterostructures", Applied Physics Review, 1, 011303 (2013).

[2] J. Falson, D. Maryenko, B. Friess, D. Zhang, Y. Kozuka, A. Tsukazaki, J. H. Smet, M. Kawasaki, "Ddd even denominator fractional quantum Hall physics in ZnO", Submitted.

Plenary: Alberto Morpurgo
Exploring the Transport Properties of Organic Semiconductors in Single-Crystal Transistors & Interfaces

The impressive progress in the development of devices based on organic semiconductors has not been paralleled by our fundamental understanding of these materials. For instance, we do not know what determines the carrier mobility in a given molecular semiconductor, and why in some cases the carrier mobility is much larger than in others. This is largely due to the insufficient chemical purity and structural quality of materials used to realize practical devices. In this talk I will present an overview of work done during the last decade to explore the fundamental transport properties of organic semiconductors, which has relied on single-crystal devices of unprecedented purity and quality. Through the observation of different intrinsic transport properties in an increasingly larger number of compounds, this work has led to the identification of microscopic electronic processes that drastically affect transport in organic semiconductors, and to first controlled comparative studies of different materials. I will focus on the physical aspects that make organic semiconductors different from the more conventional organic compounds, and emphasize how the virtually unlimited availability of different molecules can be exploited to realize new, interesting physical electronic systems.

Session Chairs

Allan H. MacDonald

The University of Texas at Austin


Masashi Kawasaki

Professor & Deputy Director, The University of Tokyo & RIKEN Center for Emergent Matter Science
Dr. Kawasaki has contributed significantly to developing advanced technologies for realizing atomic scale control in oxide thin film epitaxy. He has developed the combinatorial epitaxy technique which facilitates efficient means of fabricating many thin films with various compositions and/or structures on a substrate simultaneously. Based on these technologies, he has expanded the physics, functionality, and applications of the field of oxide... Read More →

Alberto Morpurgo

Professor, Department of Condensed Matter Physics, Université de Genève
Professor Alberto Morpurgo is an expert in the investigation of the electronic properties of materials through the study of transport in nano-fabricated devices. He received his PhD in 1998 from the University of Groningen, where he worked on mesoscopic superconducting proximity effect and other aspects of mesoscopic physics (for which he was awarded the Miedema Prize for the best Dutch PhD thesis in condensed matter physics). After a two-year... Read More →

Wednesday August 13, 2014 08:30 - 09:50
Ballroom D