University of Minnesota
School of Physics & Astronomy

CM Journal Club

Tuesday, December 8th 2015
4:30 pm:
CM Journal Club in PAN 210
Speaker: Mengqun Li
Subject: Time-reversal asymmetry without local moments via directional scalar spin chirality

Quantum phases of matter that violate time-reversal symmetry invariably develop local spin or orbital moments in the ground state, such as ferromagnets, spin density waves, electrons in loop current phases, etc. A common property is that time reversal symmetry is restored as soon as the moments melt. However, there may exist a phase of matter that violates time-reversal symmetry but has no moments, which is called the “directional scalar spin chiral order” (DSSCO) from Ref. [1]. It can be obtained by melting the spin moments in a magnetically ordered phase but retaining residual broken time-reversal symmetry.

Outline of my talk:
(1) Introduction to time-reversal symmetry and several examples
(2) Directional scalar spin chiral order(DSSCO) in 1D, 2D and 3D
(3) Experimental detection and application to the cuprates (if time allows)

Reference:
[1]:Pavan Hosur. arXiv:1510.00975

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