| 1. |
- Filipović, Milena, et al.
(författare)
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Spin transport and tunable Gilbert damping in a single-molecule magnet junction
- 2013
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Ingår i: Physical Review B. - 2469-9950 .- 2469-9969. ; 87
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Tidskriftsartikel (refereegranskat)abstract
- We study time-dependent electronic and spin transport through an electronic level connected to two leads and coupled with a single-molecule magnet via exchange interaction. The molecular spin is treated as a classical variable and precesses around an external magnetic field. We derive expressions for charge and spin currents by means of the Keldysh nonequilibrium Green's functions technique in linear order with respect to the time-dependent magnetic field created by this precession. The coupling between the electronic spins and the magnetization dynamics of the molecule creates inelastic tunneling processes which contribute to the spin currents. The inelastic spin currents, in turn, generate a spin-transfer torque acting on the molecular spin. This back-action includes a contribution to the Gilbert damping and a modification of the precession frequency. The Gilbert damping coefficient can be controlled by the bias and gate voltages or via the external magnetic field and has a nonmonotonic dependence on the tunneling rates.
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| 2. |
- Haupt, Federica, 1978, et al.
(författare)
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Correlations between charge and energy current in ac-driven coherent conductors
- 2014
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Ingår i: Journal of Physics: Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 568, s. 052008-
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Konferensbidrag (refereegranskat)abstract
- We study transport in coherent conductors driven by a time-periodic bias voltage. We present results of the charge and energy noise and complement them by a study of the mixed noise, namely the zero-frequency correlator between charge and energy current. The mixed noise presents interference contributions and transport contributions, showing features different from those of charge and energy noise. The mixed noise can be accessed by measuring the correlator between the fluctuations of the power provided to the system and the charge current.
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| 3. |
- Schulenborg, Jens, 1988, et al.
(författare)
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Fermion-parity duality and energy relaxation in interacting open systems
- 2016
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Ingår i: Physical Review B. - 2469-9969 .- 2469-9950. ; 93:8, s. 081411-
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Tidskriftsartikel (refereegranskat)abstract
- We study the transient heat current out of a confined electron system into a weakly coupled electrode in response to a voltage switch. We show that the decay of the Coulomb interaction energy for this repulsive system exhibits signatures of electron-electron attraction, and is governed by an interaction-independent rate. This can only be understood from a general duality that relates the non-unitary evolution of a quantum system to that of a dual model with inverted energies. Deriving from the fermion-parity superselection postulate, this duality applies to a large class of open systems.
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