Freezing a quantum magnet by repeated quantum interference: An experimental realization

We experimentally demonstrate the phenomenon of dynamical many-body freezing in a periodically driven Ising chain. Theoretically [A. Das, Phys. Rev. B 82, 172402 (2010) (http://dx.doi.org/10.1103/PhysRevB.82.172402)], for certain values of the drive parameters all fundamental degrees of freedom cont...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-11, Vol.90 (17), Article 174407
Main Authors: Hegde, Swathi S., Katiyar, Hemant, Mahesh, T. S., Das, Arnab
Format: Article
Language:English
Subjects:
Chain drives
Chains
Condensed matter
Degrees of freedom
Dynamical systems
Dynamics
Freezing
Magnetization
Modulation
Physics
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Summary:We experimentally demonstrate the phenomenon of dynamical many-body freezing in a periodically driven Ising chain. Theoretically [A. Das, Phys. Rev. B 82, 172402 (2010) (http://dx.doi.org/10.1103/PhysRevB.82.172402)], for certain values of the drive parameters all fundamental degrees of freedom contributing to the response dynamics freeze for all time and for arbitrary initial state. Also, since the condition of freezing involves only the drive parameters and not the quantization of the momentum (i.e., the system size), our simulation with a small (3-spin) chain captures all salient features of the freezing phenomenon predicted for the infinite chain. Using optimal control techniques, we realize high-fidelity cosine-modulated drive, and observe nonmonotonic freezing of magnetization at specific frequencies of modulation. Time evolution of the excitations in momentum space has been tracked directly through magnetization measurements.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.90.174407