# Tuning the Two-Electron Hybridization and Spin States in Parallel-Coupled InAs Quantum Dots.

@article{Nilsson2018TuningTT, title={Tuning the Two-Electron Hybridization and Spin States in Parallel-Coupled InAs Quantum Dots.}, author={Malin Nilsson and Florinda Vi{\~n}as Bostr{\"o}m and Sebastian Lehmann and Kimberly A. Dick and Martin Leijnse and Claes Thelander}, journal={Physical review letters}, year={2018}, volume={121 15}, pages={ 156802 } }

We study spin transport in the one- and two-electron regimes of parallel-coupled double quantum dots (DQDs). The DQDs are formed in InAs nanowires by a combination of crystal-phase engineering and electrostatic gating, with an interdot tunnel coupling (t) tunable by one order of magnitude. Large single-particle energy separations (up to 10 meV) and |g^{*}| factors (∼10) enable detailed studies of the B-field-induced transition from a singlet-to-triplet ground state as a function of t. In…

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## References

SHOWING 1-10 OF 41 REFERENCES

### Direct measurement of the spin-orbit interaction in a two-electron InAs nanowire quantum dot.

- PhysicsPhysical review letters
- 2007

It is found that the spin-orbit coupling mixes the T+ and S states and thus induces an avoided crossing with magnitude Delta(SO)=0.25+/-0.05 meV in tunable few-electron quantum dots defined in catalytically grown InAs nanowires.

### Excitation spectroscopy of few-electron states in artificial diatomic molecules

- Physics
- 2013

We study the excitation spectroscopy of few-electron, parallel coupled double quantum dots (QDs). By applying a finite source drain voltage to a double QD (DQD), the first excited states observed in…

### Manipulation of exchange coupling energy in a few-electron double quantum dot

- Physics
- 2008

We have used a hybrid vertical-lateral double quantum dot to study the excitation energy spectrum for one- and two-electron states, which are effectively formed on top of a certain core shell. We…

### Spin-orbital and spin Kondo effects in parallel coupled quantum dots

- Physics
- 2016

Strong electron correlations and interference effects are discussed in parallel-coupled single-level and orbitally doubly degenerate quantum dots. The finite-U mean-field slave boson approach is used…

### Singlet-triplet splitting in double quantum dots due to spin-orbit and hyperfine interactions

- Physics
- 2012

We analyze the low-energy spectrum of a two-electron double quantum dot under a potential bias in the presence of an external magnetic field. We focus on the regime of spin blockade, taking into…

### Electron transport through double quantum dots

- Physics
- 2002

Electron transport experiments on two lateral quantum dots coupled in series are reviewed. An introduction to the charge stability diagram is given in terms of the electrochemical potentials of both…

### Parallel-Coupled Quantum Dots in InAs Nanowires.

- PhysicsNano letters
- 2017

The combination of hard-wall barriers to source and drain, shallow interdot tunnel barriers, and very high single-particle excitation energies allow an order of magnitude tuning of the strength for the first intramolecular bond.

### Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot

- Physics
- 2005

Singlet-triplet spin blockade in a few-electron lateral double quantum dot is investigated using simultaneous transport and charge-sensing measurements. Transport from the (1,1) to the (0,2) electron…

### Electrically tuned spin-orbit interaction in an InAs self-assembled quantum dot.

- PhysicsNature nanotechnology
- 2011

It is demonstrated that electrical gating can be used to vary the energy of the spin-orbit interaction in the range 50-150 µeV while maintaining the electron occupation of a single self-assembled InAs quantum dot.

### Suppression of spin relaxation in an InAs nanowire double quantum dot.

- PhysicsPhysical review letters
- 2007

A model where the triplet-singlet relaxation in a double quantum dot defined by top gates in an InAs nanowire is explained by the polarization of nuclear spins enabled by the interplay between hyperfine and spin-orbit mediated relaxation is proposed.