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On Spin 1/2 Excitations and Quantum Criticality in Two Dimensional O(3) Antiferromagnets
Zaira Nazario, David I. Santiago
We show that despite the absence of a Hopf term and zero Berry phase terms, the N`eel ordered phase of 2+1 D quantum antiferromagnets have spin 1/2 excitations, i.e. spinons. The s…
On Quantum Bosonic Solids and Bosonic Superfluids
Zaira Nazario, David I. Santiago
We review the nature of superfluid ground states and the universality of their properties with emphasis to Bose Einstein Condensate systems in atomic physics. We then study the sup…
Roton Induced Modulations in Underdoped Cuprates as a Signature of Incipient Electronic Order
Zaira Nazario, David I. Santiago
In the last years there have been measurements of energy independent modulations in underdoped cuprates via scanning tunelling microscopy. These modulations of around 4 lattice con…
On The Existence of Roton Excitations in Bose Einstein Condensates: Signature of Proximity to a Mott Insulating Phase
Zaira Nazario, David I. Santiago
Within the last decade, artificially engineered Bose Einstein Condensation has been achieved in atomic systems. Bose Einstein Condensates are superfluids just like bosonic Helium i…