Leakage-current lineshapes from inelastic cotunneling in the Pauli spin blockade regime

Abstract

We find the leakage current through a double quantum dot in the Pauli spin blockade regime accounting for inelastic (spin-flip) cotunneling processes. Taking the energy-dependence of this spin-flip mechanism into account allows for an accurate description of the current as a function of applied magnetic fields, gate voltages, and an inter-dot tunnel coupling. In the presence of an additional local dephasing process or nonuniform magnetic field, we obtain a simple closed-form analytical expression for the leakage current giving the full dependence on an applied magnetic field and energy detuning. This work is important for understanding the nature of leakage, especially in systems where other spin-flip mechanisms (due, e.g., to hyperfine coupling to nuclear spins or spin-orbit coupling) are weak, including silicon and carbon-nanotube or graphene quantum dots.

11 pages, 10 figures; v2: Typos corrected, colorbar added to fig. 7, final version published in Phys. Rev. B

References in corpus (10)

• Driven coherent oscillations of a single electron spin in a quantum dot
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Suppression of spin relaxation in an InAs nanowire double quantum dot
• Pauli-Spin-Blockade Transport through a Silicon Double Quantum Dot
• Pauli Spin Blockade in a Highly Tunable Silicon Double Quantum Dot
• Large nuclear Overhauser fields detected in vertically-coupled double quantum dots
• Spin relaxation at the singlet-triplet crossing in a quantum dot
• Pauli spin blockade in carbon nanotube double quantum dots
• Stationary and transient leakage current in the Pauli spin blockade
• Spin relaxation in quantum dots due to electron exchange with leads

Cited by in corpus (20)

• Silicon Quantum Electronics
• Quantum transport in carbon nanotubes
• Electron spin resonance and spin-valley physics in a silicon double quantum dot
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• Strong spin-orbit interaction and $g$-factor renormalization of hole spins in Ge/Si nanowire quantum dots
• Magnetic field dependence of Pauli spin blockade: a window into the sources of spin relaxation in silicon quantum dots
• Magnetic Field Evolution of Spin Blockade in Ge/Si Nanowire Double Quantum Dots
• Anisotropic Pauli spin blockade in hole quantum dots
• Anisotropic g-Factor and Spin-Orbit Field in a Ge Hut Wire Double Quantum Dot
• Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot
• Inter-valley scattering induced by Coulomb interaction and disorder in carbon-nanotube quantum dots
• Pauli spin blockade in CMOS double quantum dot devices
• Nanoscale magnetic resonance spectroscopy using a carbon nanotube double quantum dot
• Current hot spot in the spin-valley blockade in carbon nanotubes
• Temperature-dependent dynamical nuclear polarization bistabilities in double quantum dots in the spin-blockade regime
• Pauli spin blockade with site-dependent g-tensors and spin-polarized leads
• Measurement of enhanced spin-orbit coupling strength for donor-bound electron spins in silicon
• Direct measurement of spin-flip rates in single-electron tunneling
• Revealing the internal spin dynamics in a double quantum dot by periodic voltage modulation
• Interplay of Pauli blockade with electron-photon coupling in quantum dots