62 citations · 213 across the 6 of their papers we have counts for
6 papers
The spin-boson model with a structured environment: A comparison of approaches
F. K. Wilhelm, S. Kleff, J. von Delft
In the spin-boson model, the properties of the oscillator bath are fully characterized by the spectral density of oscillators . We study the case when this function is of Bre…
Exploiting environmental resonances to enhance qubit quality factors
S. Kleff, S. Kehrein, J. von Delft
We discuss dephasing times for a two-level system (including bias) coupled to a damped harmonic oscillator. This system is realized in measurements on solid-state Josephson qubits.…
Flow equation renormalization of a spin-boson model with a structured bath
Silvia Kleff, Stefan Kehrein, Jan von Delft
We discuss the dynamics of a spin coupled to a damped harmonic oscillator. This system can be mapped to a spin-boson model with a structured bath, i.e. the spectral function of the…
Nonequilibrium excitations in Ferromagnetic Nanoparticles
Silvia Kleff, Jan von Delft
In recent measurements of tunneling transport through individual ferromagnetic Co nanograins, Deshmukh, Guéron, Ralph et al. \cite{mandar,gueron} (DGR) observed a tunneling spectru…
Magnetic Anisotropy Variations and Non-Equilibrium Tunneling in a Cobalt Nanoparticle
M. M. Deshmukh, S. Gueron, E. Bonet +4
We present detailed measurements of the discrete electron-tunneling level spectrum within nanometer-scale cobalt particles as a function of magnetic field and gate voltage, in this…
A Model for Ferromagnetic Nanograins with Discrete Electronic States
Silvia Kleff, Jan von Delft, Mandar M. Deshmukh +1
We propose a simple phenomenological model for an ultrasmall ferromagnetic grain, formulated in terms of the grain's discrete energy levels. We compare the model's predictions with…