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Decoherence of a single spin coupled to an interacting spin bath

Author(s): Wu, Ning; Froehling, Nina; Xing, Xi; Hackmann, Johannes; Nanduri, Arun; et al

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Abstract: Decoherence of a central spin coupled to an interacting spin bath via inhomogeneous Heisenberg coupling is studied by two different approaches, namely an exact equations of motion (EOMs) method and a Chebyshev expansion technique (CET). By assuming a wheel topology of the bath spins with uniform nearest-neighbor XX-type intrabath coupling, we examine the central spin dynamics with the bath prepared in two different types of bath initial conditions. For fully polarized baths in strong magnetic fields, the polarization dynamics of the central spin exhibits a collapse-revival behavior in the intermediate-time regime. Under an antiferromagnetic bath initial condition, the two methods give excellently consistent central spin decoherence dynamics for finite-size baths of N <= 14 bath spins. The decoherence factor is found to drop off abruptly on a short time scale and approach a finite plateau value which depends on the intrabath coupling strength nonmonotonically. In the ultrastrong intrabath coupling regime, the plateau values show an oscillatory behavior depending on whether N/2 is even or odd. The observed results are interpreted qualitatively within the framework of the EOM and perturbation analysis. The effects of anisotropic spin-bath coupling and inhomogeneous intrabath bath couplings are briefly discussed. Possible experimental realization of the model in a modified quantum corral setup is suggested.
Publication Date: 19-Jan-2016
Citation: Wu, Ning, Froehling, Nina, Xing, Xi, Hackmann, Johannes, Nanduri, Arun, Anders, Frithjof B., Rabitz, Herschel. (2016). Decoherence of a single spin coupled to an interacting spin bath. PHYSICAL REVIEW B, 93 (10.1103/PhysRevB.93.035430
DOI: doi:10.1103/PhysRevB.93.035430
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 013408-1 - 013408-12
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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