Current hot spot in the spin-valley blockade in carbon nanotubes

Abstract

We present a theoretical study of the spin-valley blockade transport effect in a double quantum dot defined in a straight carbon nanotube. We find that intervalley scattering due to short-range impurities completely lifts the spin-valley blockade and induces a large leakage current in a certain confined range of the external magnetic field vector. This current hot spot emerges due to different effective magnetic fields acting on the spin-valley qubit states of the two quantum dots. Our predictions are compared to a recent measurement [F. Pei et al., Nat. Nanotech. 7, 630 (2012)]. We discuss the implications for blockade-based schemes for qubit initialization/readout, and motion sensing of nanotube-based mechanical resonators.

9 pages, 5 figures

References in corpus (15)

• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
• Large spin-orbit coupling in carbon nanotubes
• Tunable few-electron double quantum dots and Klein tunnelling in ultra-clean carbon nanotubes
• Valley-spin blockade and spin resonance in carbon nanotubes
• Observation and Spectroscopy of a Two-Electron Wigner Molecule in an Ultra-Clean Carbon Nanotube
• Bends In Nanotubes Allow Electric Spin Control and Coupling
• Coulomb versus spin-orbit interaction in few-electron carbon-nanotube quantum dots
• Pauli spin blockade in carbon nanotube double quantum dots
• Interplay of Kondo effect and strong spin-orbit coupling in multi-hole ultraclean carbon nanotubes
• Few-electron physics in a nanotube quantum dot with spin-orbit coupling
• Inter-valley scattering induced by Coulomb interaction and disorder in carbon-nanotube quantum dots
• Pauli spin blockade and the ultrasmall magnetic field effect

Cited by in corpus (8)

• Quantum transport in carbon nanotubes
• Maximal Rabi frequency of an electrically driven spin in a disordered magnetic field
• Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube
• Shape-sensitive Pauli blockade in a bent carbon nanotube
• Coulomb-blockade and Pauli-blockade magnetometry
• Spin-valley dynamics of electrically driven ambipolar carbon-nanotube quantum dots
• Creating arbitrary quantum vibrational states in a carbon nanotube
• Electronic structure of (1e,1h) states of carbon nanotube quantum dots