659 citations · 2.8k across the 42 of their papers we have counts for
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Sweet-spot operation of a germanium hole spin qubit with highly anisotropic noise sensitivity
N. W. Hendrickx, L. Massai, M. Mergenthaler +5
Spin qubits defined by valence band hole states comprise an attractive candidate for quantum information processing due to their inherent coupling to electric fields enabling fast…
Modular nanomagnet design for spin qubits confined in a linear chain
Michele Aldeghi, Rolf Allenspach, Gian Salis
On-chip micromagnets enable electrically controlled quantum gates on electron spin qubits. Extending the concept to a large number of qubits is challenging in terms of providing la…
Control of Spin Relaxation Anisotropy by Spin-Orbit-Coupled Diffusive Spin Motion
Daisuke Iizasa, Asuka Aoki, Takahito Saito +3
Spatiotemporal spin dynamics under spin-orbit interaction is investigated in a (001) GaAs two-dimensional electron gas using magneto-optical Kerr rotation microscopy. Spin polarize…
Universal nuclear focusing of confined electron spins
Sergej Markmann, Christian Reichl, Werner Wegscheider +1
For spin-based quantum computation in semiconductors, dephasing of electron spins by a fluctuating background of nuclear spins is a main obstacle. Here we show that this nuclear ba…
Characterization of spin-orbit fields in InGaAs quantum wells
T. Henn, L. Czornomaz, G. Salis
Coherent electron spin dynamics in 10-nm-wide InGaAs/InAlAs quantum wells is studied from 10 K to room temperature using time-resolved Kerr rotation. The spin lifetime exceeds 1 ns…
Spin drift and diffusion in one- and two-subband helical systems
Gerson J. Ferreira, Felix G. G. Hernandez, Patrick Altmann +1
The theory of spin drift and diffusion in two-dimensional electron gases is developed in terms of a random walk model incorporating Rashba, linear and cubic Dresselhaus, and inters…
Current-controlled Spin Precession of Quasi-Stationary Electrons in a Cubic Spin-Orbit Field
P. Altmann, F. G. G. Hernandez, G. J. Ferreira +4
Space- and time-resolved measurements of spin drift and diffusion are performed on a GaAs-hosted two-dimensional electron gas. For spins where forward drift is compensated by backw…
Transition of a 2D spin mode to a helical state by lateral confinement
P. Altmann, M. Kohda, C. Reichl +2
Spin-orbit interaction (SOI) leads to spin precession about a momentum-dependent spin-orbit field. In a diffusive two-dimensional (2D) electron gas, the spin orientation at a given…
Suppressed decay of a laterally confined persistent spin helix
P. Altmann, M. P. Walser, C. Reichl +2
We experimentally investigate the dynamics of a persistent spin helix in etched GaAs wire structures of 2 to 80 um width. Using magneto-optical Kerr rotation with high spatial reso…
Dynamics of a localized spin excitation close to the spin-helix regime
G. Salis, M. P. Walser, P. Altmann +2
The time evolution of a local spin excitation in a (001)-confined two-dimensional electron gas subjected to Rashba and Dresselhaus spin-orbit interactions of similar strength is in…
Direct mapping of the formation of a persistent spin helix: Supplementary information
M. P. Walser, C. Reichl, W. Wegscheider +1
The spin-orbit interaction (SOI) in zincblende semiconductor quantum wells can be set to a symmetry point, in which spin decay is strongly suppressed for a helical spin mode. Signa…
Breakdown of the Korringa Law of Nuclear Spin Relaxation in Metallic GaAs
D. Kölbl, D. M. Zumbühl, A. Fuhrer +2
We present nuclear spin relaxation measurements in GaAs epilayers using a new pump-probe technique in all-electrical, lateral spin-valve devices. The measured T1 times agree very w…
The Nuclear Spin Environment in Lateral GaAs Spin Valves
D. Kölbl, D. M. Zumbühl, A. Fuhrer +2
The spin degree of freedom in solids offers opportunities beyond charge-based electronics and is actively investigated for both spintronics and quantum computation. However, the in…
Spin-injection spectra of CoFe/GaAs contacts: dependence on Fe concentration, interface and annealing conditions
G. Salis, S. F. Alvarado, A. Fuhrer
Spin injection from Co70Fe30 and Fe contacts into bulk GaAs(001) epilayers is studied experimentally. Using nonlocal measurements, the spin polarization of the differential conduct…
Optical polarization of localized hole spins in p-doped quantum wells
M. Studer, M. Hirmer, D. Schuh +3
The initialization of spin polarization in localized hole states is investigated using time-resolved Kerr rotation. We find that the sign of the polarization depends on the magneti…
Role of linear and cubic terms for the drift-induced Dresselhaus spin-orbit splitting in a two-dimensional electron gas
M. Studer, M. P. Walser, S. Baer +6
The Dresselhaus spin-orbit interaction (SOI) of a series of two-dimensional electron gases (2DEGs) hosted in GaAs/AlGaAs and InGaAs/GaAs (001) quantum wells (QWs) is measured by mo…
Temperature dependence of the nonlocal voltage in an Fe/GaAs electrical spin injection device
G. Salis, A. Fuhrer, R. R. Schlittler +2
The nonlocal spin resistance is measured as a function of temperature in a Fe/GaAs spin-injection device. For nonannealed samples that show minority-spin injection, the spin resist…
Signatures of dynamically polarized nuclear spins in all-electrical lateral spin transport devices
G. Salis, A. Fuhrer, S. F. Alvarado
The effect of nuclear spins in Fe/GaAs all-electrical spin-injection devices is investigated. At temperatures below 50 K, strong modifications of the non-local spin signal are foun…
Gate-controlled spin-orbit interaction in a parabolic GaAs/AlGaAs quantum well
M. Studer, G. Salis, K. Ensslin +2
We study the tunability of the spin-orbit interaction in a two-dimensional electron gas with a front and a back gate electrode by monitoring the spin precession frequency of drifti…
Spin-orbit interaction and spin relaxation in a two-dimensional electron gas
M. Studer, S. Schön, K. Ensslin +1
Using time-resolved Faraday rotation, the drift-induced spin-orbit Field of a two-dimensional electron gas in an InGaAs quantum well is measured. Including measurements of the elec…
Two-dimensional imaging of the spin-orbit effective magnetic field
L. Meier, G. Salis, E. Gini +2
We report on spatially resolved measurements of the spin-orbit effective magnetic field in a GaAs/InGaAs quantum-well. Biased gate electrodes lead to an electric-field distribution…
Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
Lorenz Meier, Gian Salis, Ivan Shorubalko +3
Spin-orbit coupling is a manifestation of special relativity. In the reference frame of a moving electron, electric fields transform into magnetic fields, which interact with the e…
Optimized stray-field-induced enhancement of the electron spin precession by buried Fe gates
L. Meier, G. Salis, N. Moll +5
The magnetic stray field from Fe gates is used to modify the spin precession frequency of InGaAs/GaAs quantum-well electrons in an external magnetic field. By using an etching proc…
Gate tunability of stray-field-induced electron spin precession in a GaAs/InGaAs quantum well below an interdigitated magnetized Fe grating
L. Meier, G. Salis, C. Ellenberger +2
Time-resolved Faraday rotation is used to measure the coherent electron spin precession in a GaAs/InGaAs quantum well below an interdigitated magnetized Fe grating. We show that th…