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Quantum dynamics of a mobile spin impurity

Fukuhara, Takeshi and Kantian, Adrian and Endres, Manuel and Cheneau, Marc and Schauß, Peter and Hild, Sebastian and Bellem, David and Schollwöck, Ulrich and Giamarchi, Thierry and Gross, Christian and Bloch, Immanuel and Kuhr, Stefan (2013) Quantum dynamics of a mobile spin impurity. Nature Physics, 9 (4). pp. 235-241. ISSN 1745-2473.

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One of the elementary processes in quantum magnetism is the propagation of spin excitations. Here we study the quantum dynamics of a deterministically created spin-impurity atom, as it propagates in a one-dimensional lattice system. We probe the spatial probability distribution of the impurity at different times using single-site-resolved imaging of bosonic atoms in an optical lattice. In the Mott-insulating regime, the quantum-coherent propagation of a magnetic excitation in the Heisenberg model can be observed using a post-selection technique. Extending the study to the superfluid regime of the bath, we quantitatively determine how the bath affects the motion of the impurity, showing evidence of polaronic behaviour. The experimental data agree with theoretical predictions, allowing us to determine the effect of temperature on the impurity motion. Our results provide a new approach to studying quantum magnetism, mobile impurities in quantum fluids and polarons in lattice systems.

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Endres, Manuel0000-0002-4461-224X
Additional Information:© 2013 Macmillan Publishers Limited. Received 26 September 2012; accepted 21 January 2013; published online 24 February 2013. We thank C. Weitenberg for his contribution to the addressing scheme. This work was supported by MPG, DFG, EU (NAMEQUAM, AQUTE, Marie Curie Fellowship to M.C.) and JSPS (Postdoctoral Fellowship for Research Abroad to T.F.) and in part by the Swiss NSF under MaNEP and Division II. Author contributions All authors contributed extensively to the work presented in this paper.
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
European Union (EU)UNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Swiss National Science Foundation (SNSF)UNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20160527-105926301
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Official Citation:Quantum dynamics of a mobile spin impurity Takeshi Fukuhara, Adrian Kantian, Manuel Endres, Marc Cheneau, Peter Schauß, Sebastian Hild, David Bellem, Ulrich Schollwöck, Thierry Giamarchi, Christian Gross, Immanuel Bloch & Stefan Kuhr Nature Physics 9, 235–241 (2013) doi:10.1038/nphys2561
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67447
Deposited By: Ruth Sustaita
Deposited On:27 May 2016 18:17
Last Modified:30 Oct 2019 19:30

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