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Durham University

Durham Emergence Project

Fellowship


Emergent phenomena in magnetic systems showing quantum phase transitions


Participants

Fan Xiao


Project Description

Fan Xiao experimentally studied a family of molecule-based magnetic system that would help us better understand simple models described in quantum mechanics. The idea is to replace the unique bond in the two dimensional lattice, (Quinolinium)2CuBr4(1-x)Cl4x∙2H2O with another one with different strength and search for emergent exotic phenomena. It was found that with the presence of randomness, the system loses the ability to stay ordered at low temperature and enters into a regime where new properties may develop. The conclusion of the project is that this is a promising approach for the identification of emergent ground states in condensed matter physics.


Publications

(2017) Tom Lancaster and Fan Xiao (with others): Quantum-critical spin dynamics in a Tomonaga-Luttinger liquid studied with muon-spin relaxation. Physical Review B.

(2016) Tom Lancaster and Fan Xiao (with others): Transverse field muon-spin rotation measurement of the topological anomaly in a thin film of MnSi. Physical Review B.

(2015) Tom Lancaster and Fan Xiao (with others): Transverse field muon-spin rotation signature of the skyrmion-lattice phase in Cu2OSeO3. Physical Review B.

(2015) Tom Lancaster and Fan Xiao (with others): Spin diffusion in the low-dimensional molecular quantum Heisenberg antiferromagnet Cu(pyz)(NO3)2 detected with implanted muons. Physical Review B.


Figure 1: A phase diagram of both a classical phase transition and a quantum phase transition. The quantum phase transition is driven by quantum fluctuations and occurs at zero temperature only.