Abstract
We monitor the Landau-Zener dynamics of a single-ion magnet inserted into a spin-transistor geometry. For increasing field-sweep rates, the spin reversal probability shows increasing deviations from that of a closed system. In the low-conductance limit, such deviations are shown to result from a dephasing process. In particular, the observed behaviors are successfully simulated by means of an adiabatic master equation, with time averaged dephasing (Lindblad) operators. The time average is tentatively interpreted in terms of the finite time resolution of the continuous measurement.
Highlights
Introduction.—The dynamics of a quantum system driven through an avoided level crossing represents a relevant problem in many physical contexts
We monitor the Landau-Zener dynamics of a single-ion magnet inserted into a spin-transistor geometry
We experimentally and theoretically investigate the Landau-Zener dynamics of a single-ion magnet that is continuously measured by current within a molecular spin transistor geometry
Summary
Introduction.—The dynamics of a quantum system driven through an avoided level crossing represents a relevant problem in many physical contexts. We experimentally and theoretically investigate the Landau-Zener dynamics of a single-ion magnet that is continuously measured by current within a molecular spin transistor geometry. The observed dependence of the spinreversal probability on the field-sweep rate presents clear deviations from the Landau-Zener formula, and from the behavior of an isolated quantum system.
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