Tuning the two-electron hybridization and spin states in parallel-coupled InAs quantum dots

Abstract

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 $|g^{\ast }|$ factors ($\sim$10) enable detailed studies of the $B$-field-induced transition from a singlet-to-triplet ground state as a function of $t$. In particular, we investigate how the magnitude of the spin-orbit-induced singlet-triplet anticrossing depends on $t$. For cases of strong coupling, we find values of 230 $\mu$eV for the anticrossing using excited-state spectroscopy. Experimental results are reproduced by calculations based on rate equations and a DQD model including a single orbital in each dot.

arXiv comment5 pages, 4 figures

References in corpus (22)

• Quantum Computation with Quantum Dots
• Spins in few-electron quantum dots
• Electron transport through double quantum dots
• Spin-orbit qubit in a semiconductor nanowire
• Spin relaxation in semiconductor quantum dots
• Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
• Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots
• Orbital Kondo effect in carbon nanotubes
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot
• Suppression of spin relaxation in an InAs nanowire double quantum dot
• Pauli Spin Blockade in the Presence of Strong Spin-Orbit Coupling
• Disentangling the effects of spin-orbit and hyperfine interactions on spin blockade
• Singlet-triplet splitting in double quantum dots due to spin orbit and hyperfine interactions
• Spin state mixing in InAs double quantum dots
• Single-electron transport in InAs nanowire quantum dots formed by crystal phase engineering
• Aharonov-Bohm Oscillations Changed by Indirect Interdot Tunneling via Electrodes in Parallel-Coupled Vertical Double Quantum Dots
• Exchange cotunneling through quantum dots with spin-orbit coupling
• Electron-hole interactions in coupled InAs-GaSb quantum dots based on nanowire crystal phase templates
• Spin-orbital and spin Kondo effects in parallel coupled quantum dots
• Superconducting Transport in single and parallel double InAs Quantum Dot Josephson Junctions with Nb-based Superconducting Electrodes
• Excitation spectroscopy of few-electron states in artificial diatomic molecules

Cited by in corpus (10)

• Spectroscopy of the superconducting proximity effect in nanowires using integrated quantum dots
• Strong coupling between a microwave photon and a singlet-triplet qubit
• Orbital Tuning of Tunnel Coupling in InAs/InP Nanowire Quantum Dots
• Electrical control of spins and giant g-factors in ring-like coupled quantum dots
• Josephson current via spin and orbital states of a tunable double quantum dot
• A Systematic Investigation of the Coupling between One-Dimensional Edge States of a Topological Crystalline Insulator
• Symmetry-controlled singlet-triplet transition in a double-barrier quantum ring
• Magnon-mediated topological superconductivity in a quantum wire
• Spectroscopy and level detuning of few-electron spin states in parallel InAs quantum dots
• Selective tuning of spin-orbital Kondo contributions in parallel-coupled quantum dots