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Seminar:Establishing structure-property relationships in quantum materials: Controlling and manipulating emergent states of matter

Peter Wahl

University of St Andrews, UK

Time: 2:00pm, June 12, 2018

Location: Room 201, Teaching Building 12, Yuquan Campus, Zhejiang University

Abstract

Quantum materials host many properties, which are highly desirable for technological applications, yet our lack of understanding of their physics often prevents them from being exploited. A delicate balance between different competing interactions results in emergent phenomena such as magnetic order and superconductivity. Understanding the interactions which govern these phases is believed to be key to unravelling their enigmatic properties and making them amenable for applications.

In my talk, I will show new ways to control the emergent properties of quantum materials exemplarily for two materials systems. In the first one, Fe1+Te (fig. 1). I will show how we can control the magnetic order through manipulation of the surface composition, and how the results can be used to understand the dominant magnetic interactions for the magnetic order.

For the second example, using in-situ tuning of uniaxial strain, we discover a new, previously unseen, charge density wave order in LiFeAs once subjected to strain, providing evidence for significant electron-lattice coupling in this iron-based superconductor.

Both examples highlight the opportunities of combining atomic scale imaging and spectroscopy with manipulation of materials properties to establish a better understanding of quantum materials.