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Add to Calendar 12/5/2018 4:00 pm 12/5/2018 America/Chicago "Spin Orbit Coupled Quantum Magnetism” DESCRIPTION:

Abstract: Strong quantum fluctuations and spin entanglement can lead to exotic emergent many body properties of materials, such as fractionalized excitations predicted for quantum spin liquids, or the field-tuned Bose Einstein Condensation observed in quantum dimer crystals.  Traditionally, the materials space in which these types of phases are sought has been limited to materials with “pure" spin 1/2, as obtainable from Cu2+ for instance, and most theories have therefore focused on the isotropic exchange limit.  However, attention has recently shifted towards quantum materials in which an interplay of strong spin orbit coupling and crystal field effects lead to a "pseudo-spin" 1/2.  The interactions in these materials can be described by anisotropic effective exchange models, which lead to new quantum many body phenomena such as the Majorana fermion excitations of Kitaev quantum spin liquid.  To explore quantum phases arising from anisotropic exchange, we are searching for new materials hosting a spin-orbit coupled pseudo-spin 1/2.  I will discuss some recent examples, including a new example from our group of a Yb3+ based quantum dimer crystal, and series of puzzling pyrochlores.

\n\nSPEAKER:

Kate Ross, Colorado State University

141 Loomis Lab

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"Spin Orbit Coupled Quantum Magnetism”

Speaker Kate Ross, Colorado State University
Date: 12/5/2018
Time: 4 p.m.
Location:

141 Loomis Lab

Event Contact: Suzanne Hallihan
217-244-7151
shalliha@illinois.edu
Cost:

none

Sponsor:

Department of Physics

Event Type: Other
 

Abstract: Strong quantum fluctuations and spin entanglement can lead to exotic emergent many body properties of materials, such as fractionalized excitations predicted for quantum spin liquids, or the field-tuned Bose Einstein Condensation observed in quantum dimer crystals.  Traditionally, the materials space in which these types of phases are sought has been limited to materials with “pure" spin 1/2, as obtainable from Cu2+ for instance, and most theories have therefore focused on the isotropic exchange limit.  However, attention has recently shifted towards quantum materials in which an interplay of strong spin orbit coupling and crystal field effects lead to a "pseudo-spin" 1/2.  The interactions in these materials can be described by anisotropic effective exchange models, which lead to new quantum many body phenomena such as the Majorana fermion excitations of Kitaev quantum spin liquid.  To explore quantum phases arising from anisotropic exchange, we are searching for new materials hosting a spin-orbit coupled pseudo-spin 1/2.  I will discuss some recent examples, including a new example from our group of a Yb3+ based quantum dimer crystal, and series of puzzling pyrochlores.

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