Landau-Zener transition of a two-level system driven by spin chains near their critical points |
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| Authors: | L C Wang X L Huang X X Yi |
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| Institution: | (1) School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, P.R. China |
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| Abstract: | The Landau-Zener (LZ) transition of a two-level system
coupling to spin chains near their critical points is studied in
this paper. Two kinds of spin chains, the Ising spin chain and XY
spin chain, are considered. We calculate and analyze the effects of
system-chain coupling on the LZ transition. A relation between the
LZ transition and the critical points of the spin chain is
established. These results suggest that LZ transitions may serve as
the witnesses of criticality of the spin chain. This may provide a
new way to study quantum phase transitions as well as LZ transitions. |
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| Keywords: | 32 80 Bx Level crossing and optical pumping 03 65 Yz Decoherence open systems quantum statistical methods 05 70 Jk Critical point phenomena 05 50 +q Lattice theory and statistics |
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