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Supersymmetry in the space-time R × S3
Global N = 1 supersymmetry is implemented on the surface of a four-dimensional sphere, in order to obtain a rotationally invariant and infrared-regulated version of such theories. We find that onlyExpand
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Spin-S Kitaev model: Classical ground states, order from disorder, and exact correlation functions
In the first part of this paper, we study the spin-S Kitaev model using spin-wave theory. We discover a remarkable geometry of the minimum-energy surface in the N-spin space. The classical groundExpand
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Quantum Phase Transitions in Transverse Field Spin Models: From Statistical Physics to Quantum Information
The transverse field Ising and XY models (the simplest quantum spin models) provide the organising principle for the rich variety of interconnected subjects which are covered in this book. From aExpand
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Exact results for quench dynamics and defect production in a two-dimensional model.
We show that for a d-dimensional model in which a quench with a rate tau(-1) takes the system across a (d-m)-dimensional critical surface, the defect density scales as n approximatelyExpand
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Quantization of the Derivative Nonlinear Schrodinger Equation
  • D. Sen
  • Physics, Mathematics
  • 9 December 1996
We study the quantum mechanics of the derivative nonlinear Schrodinger equation which has appeared in many areas of physics and is known to be classically integrable. We find that the N-body quantumExpand
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Generating a second-order topological insulator with multiple corner states by periodic driving
We study the effects of periodic driving on a variant of the Bernevig-Hughes-Zhang (BHZ) model defined on a square lattice. In the absence of driving, the model has both topological andExpand
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Spin injection into a metal from a topological insulator
We study a junction of a topological insulator with a thin two-dimensional nonmagnetic or partially polarized ferromagnetic metallic film deposited on a three-dimensional insulator. We show, byExpand
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Quenching dynamics of a quantum XY spin-1/2 chain in a transverse field
We study the quantum dynamics of a one-dimensional spin-$1/2$ anisotropic XY model in a transverse field when the transverse field or the anisotropic interaction is quenched at a slow but uniformExpand
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Non-equilibrium Dynamics of Quantum Systems: Order Parameter Evolution, Defect Generation, and Qubit Transfer
The properties of systems near quantum critical points (QCPs) have been studied extensively in recent years [1, 2]. A QCP is a point across which the symmetry of the ground state of a quantum systemExpand
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