PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
 | Low Spin State Mott Insulators and Emergence of novel Quantum Spin Liquids Speaker(s): Ganapathy Baskaran
Abstract: In a conventional Mott insulator, magnitude of local spin moments remain fixed. They are `fixed spin Mott insulators'. We suggest that, in a multi orbital Hubbard model, when local Hund coupling is won over by inter-orbital superexchange couplings between neighboring sites, local spin moment can dec... read more
Date: 14/02/2014 - 11:00 am
Collection: Emergence in Complex Systems
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 | Silicene - a Wonder Electron Carpet Speaker(s): Ganapathy Baskaran
Abstract: Graphene is a 2
dimensional net of strongly bonded carbon atoms. This magic carpet has taken us to new heights in the last decade. Silicene and Germanene are analogue nets, made of silicon and germanium atoms respectively, but with a relatively weaker chemical bond. I will argue that these carpets ... read more
Date: 29/10/2013 - 3:30 pm
Series: Condensed Matter
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 | Emergent Fermionic Strings in Bosonic He4 Crystal Speaker(s): Ganapathy Baskaran
Abstract: Large zero point motion of light atoms in solid Helium 4 leads to several anomalous properties, including a supersolid type behavior. We suggest an `anisotropic quantum melted' atom density wave model for solid He4 with hcp symmetry. Here, atoms preferentially quantum melt along the c-axis and maint... read more
Date: 06/05/2013 - 2:00 pm
Collection: Emergence & Entanglement II 2013
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 | Unconventional Magnetism and Superconductivity in 3 Dimensional Doped Mott Insulators Speaker(s): Ganapathy Baskaran
Abstract: Utilizing a variety and also
constraints offered by quantum and solid
state chemistry, we discuss
possibilities of unconventional quantum
magnetism and superconductivity
in doped 3 dimensional Mott insulators.
Some of the possibilities are
quantum spin liquid states having pseudo
fer... read more
Date: 30/04/2013 - 3:30 pm
Series: Condensed Matter
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 | Superradiant Superconductivity Speaker(s): Ganapathy Baskaran
Abstract: In Dicke Superradiance, a collection of 2-level atoms
interacting with a single boson mode acquires, through quantum coherence, an
enhanced emission property and a rich dynamics. We suggest possibility of Dicke
superradiance in a BCS superconductor. The necessary 2-level atoms are
identified wit... read more
Date: 16/11/2012 - 2:30 pm
Series: Condensed Matter
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 | Warm Superconductors Speaker(s): Ganapathy Baskaran
Abstract:
Date: 10/10/2012 - 2:00 pm
Series: Colloquium
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 | Emergent Gauge Fields and their Condensation in Quantum Spin Liquids Speaker(s): Ganapathy Baskaran
Abstract: Large quantum fluctuations in certain quantum spin systems destroy long range magnetic order such as antiferromagnetism. Resulting paramagnetic states are called a quantum spin liquids. These states support emergent gauge fields [1]. Under certain conditions, emergent gauge fields condense in the gr... read more
Date: 11/05/2012 - 2:30 pm
Series: Condensed Matter
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 | More is Different in the Quantum World, in its Own Way Speaker(s): Ganapathy Baskaran
Abstract: In his article `More is Different', P W Anderson (1972) sensitized the physics community about importance of emergence, by using concepts such as broken symmetry, emergent hierarchical structures, constructionists converse of reductionism etc. The manifestation of complexity and hierarchy in the qua... read more
Date: 28/10/2011 - 2:30 pm
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 | Baby Skyrmion Superconductivity in a doped Antiferromagnet K2Fe4S5 Speaker(s): Ganapathy Baskaran
Abstract: Strongly correlated electron systems are play grounds for exotic quantum states such as high Tc superconductivity, quantum spin liquids, non-fermi liquids and so on. Recently high Tc superconductivity has been observed in an iron based compound K2Fe4Se5. I will present a model and outline an effecti... read more
Date: 29/08/2011 - 12:05 pm
Series: Condensed Matter
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