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The bellow is colloquium schedule in Physics department. Every Wednesday 4:00 PM, colloquium is held in seminar room (Science Building III -201) Also, Free tea time will be held 30 minutes before colloquium stars. Please visit and enjoy the colloquium and tea time.


Colloquium 장소 및 시간: 세미나실(공학3동 201호) 오후 4시
연락처 : 물리학과 김기석교수 (279-2082), tkfkd@postech.ac.kr

          물리학과 사무실 김수경 (279-5971) skyung@postech.ac.kr

Novel States of Matter and Excitations in Low-dimensional and Frustrated Quantum Magnets

speaker : Prof. Kwang-Yong Choi[Chung-Ang Univ.]

location :

date : 2014-10-15

In everyday life, we experience four states of matter: gas, liquid, solid, and plasma. In extreme conditions, many more other states can be observed, for example, BEC of ultra-cold atoms, superconductivity, and neutron-degenerate matters in a neutron state. In addition, low-dimensional frustrated quantum magnets can provide a promising route to achieve novel states of matter, which have no precedent in a particle system. The paradigmatic instances are spin liquid and spin nematic. Spin liquid is a disordered and entangled state of matter on a quantum level, which breaks neither time-reversal nor spin-rotational symmetry. A spin nematic is a magnetic analog of liquid crystal. It has no magnetic order but still breaks a spin-rotational symmetry in a spin space. In this talk, after reviewing the long-sought efforts of observing such states in a spin system, we will present our on-going experimental results. Specifically, we will provide evidence for spin-orbit coupling tuned spin liquid in the two-dimensional triangular antiferromagnets Ba3Ru1-xIrxTi2O9, and then explore the possibility of multipolar ordering in the FM-AFM frustrated spin chain LiCuSbO4.