Detection of spin polarization utilizing singlet and triplet states in a single-lead quantum dot

Abstract

We propose and demonstrate a new method to probe local spin polarization in semiconductor micro devices at low and zero magnetic fields. By connecting a single-lead quantum dot to a semiconductor micro device and monitoring electron tunneling into singlet and triplet states in the dot, we can detect the local spin polarization formed in the target device. We confirm the validity of this detection scheme utilizing spin split quantum Hall edge states. We also observe non-zero local spin polarization at the device edge in low magnetic fields, which is not detectable with conventional macroscopic probes.

4 pages, 3 figures

References in corpus (16)

• Spintronics: Fundamentals and applications
• Single-shot read-out of an individual electron spin in a quantum dot
• Possible Spin Polarization in a One-Dimensional Electron Gas
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Bias and temperature dependence of the 0.7 conductance anomaly in Quantum Point Contacts
• All-Electric Quantum Point Contact Spin Valve
• Pure spin currents and associated electrical voltage
• Excited-state spectroscopy on a nearly-closed quantum dot via charge detection
• Mesoscopic Stern-Gerlach spin filter by nonuniform spin-orbit interaction
• Ballistic Spin Resonance
• Spin Polarization at Semiconductor Point Contacts in Absence of Magnetic Field
• Spin filtering by a periodic nanospintronic devices
• Spin filtering due to quantum interference in periodic mesoscopic networks
• Fano Effect in a Few-Electron Quantum Dot
• Detection of spin polarization with a side coupled quantum dot
• Excited-state spectroscopy on a quantum dot side-coupled to a quantum wire

Cited by in corpus (7)

• Two-axis control of a singlet-triplet qubit with an integrated micromagnet
• Majorana-like localized spin density without bound states in topologically trivial spin-orbit coupled nanowires
• Magnetic field effects on a nanowire with inhomogeneous Rashba spin-orbit coupling: Spin properties at equilibrium
• Spin-dependent current through a quantum dot from spin-polarized non-equilibrium quantum Hall edge channels
• Fast probe of local electronic states in nanostructures utilizing a single-lead quantum dot
• Spin-filtering and charge- and spin-switching effects in a quantum wire with periodically attached stubs
• Charge state estimation in quantum dots using a Bayesian approach