IISER Pune
INDIAN INSTITUTE OF SCIENCE EDUCATION AND RESEARCH (IISER) PUNE
where tomorrow’s science begins today
An Autonomous Institution, Ministry of Human Resource Development, Govt. of India
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Seminars and Colloquia

Physics

Understanding disorder-induced phases in dipolar spin ice 
 
Thu, May 23, 2019,   03:00 PM at Seminar Hall 31, 2nd Floor, Main Building

Dr. Arnab Sen
IACS Kolkata

Abstract: 
Spin liquids, despite their apparently featureless ground states, are exotic magnetic states which host fractionalised excitations and emergent gauge fields. Interestingly, quenched disorder can nucleate defects with unusual properties and thus reveal the hidden collective excitations of such states. In this talk, I will explain how disorder affects the physics of a prototypical frustrated magnet, dipolar spin ice, both at high and low temperatures and in fact leads to a new phase at low temperature. This "topological spin glass” phase shows signatures of both spin liquidity and glassiness. I will also describe a new cluster algorithm that allows us to study the continuous phase transition to the topological spin glass and reliably extract the critical temperature and exponents.
 

 

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