Vanishing current hysteresis under competing nuclear spin pumping processes in a quadruplet spin-blockaded double quantum dot

Journal Article · Mon Apr 27 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4919101· OSTI ID:22398964

Hatano, T. ^[1]; Tarucha, S. ^[1]; Gupta, J. A.; Austing, D. G. ^[2]

---

1. Quantum Spin Information Project, Japan Science and Technology Agency, ICORP, 3-1, Morinosato Wakamiya, Atsugi-shi, Kanagawa 243-0198 (Japan)
2. National Research Council of Canada, M50, Montreal Road, Ottawa, Ontario K1A 0R6 (Canada)

We investigate nuclear spin pumping with five-electron quadruplet spin states in a spin-blockaded weakly coupled vertical double quantum dot device. Two types of hysteretic steps in the leakage current are observed on sweeping the magnetic field and are associated with bidirectional polarization of nuclear spin. Properties of the steps are understood in terms of bias-voltage-dependent conditions for the mixing of quadruplet and doublet spin states by the hyperfine interaction. The hysteretic steps vanish when up- and down-nuclear spin pumping processes are in close competition.

• OSTI ID: 22398964
• Journal Information: Applied Physics Letters, Vol. 106, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ELECTRIC POTENTIAL
ELECTRONS
HYPERFINE STRUCTURE
HYSTERESIS
LEAKAGE CURRENT
MAGNETIC FIELDS
POLARIZATION
PUMPING
QUANTUM DOTS
SPIN