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Santanu Pal (Indian Institute of Science Education and Research, Kolkata)
Date & Time
Wed, 09 January 2019, 10:45 to 11:30
Amal Raychaudhuri Meeting Room, ICTS Campus, Bangalore

My talk has three parts:  (i)  In the first part of my talk,  by deriving microscopic spin-orbital  Hamiltonian for geometrically frustrated  Mn3O4 spinel, I will explain how orbital physics helps spin physics to order at low temperature. I will also discuss the effect of spin-lattice coupling in the system. 

(ii) In the second part of my talk, with the help of Lieb-Schultz-Mattis(LSM) theorem and Oshikawa-Yamanaka-Affleck (OYA) criteria on $S=1/2$ kagome and triangular antiferromagnet,  will discuss the zero and non-zero external magnetic field ground states properties. I also discuss OYA-criteria and the location of possible magnetization plateaux for $S=1/2$ pyrochlore.

(iii) The final part of my talk will devote to study the ground state properties of 1/3 magnetization plateau for $S=1/2$ XXZ kagome antiferromagnet.  Here we employ renormalization group (RG) analysis for taken care of two-particle scattering physics.