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Tunable All Electric Spin Polarizer

Bhandari, Nikhil K.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1393237571

Abstract Details

2014, PhD, University of Cincinnati, Engineering and Applied Science: Electrical Engineering.
To realize the full potential of spin-based devices, ways must be found to inject, manipulate, and detect the spin of the electron by purely electrical means. Previously, our group has shown that a quantum point contact (QPC) with lateral spin orbit coupling (LSOC) can be used to create a strongly spin-polarized current by purely electrical means. The LSOC results from the lateral in-plane electric field created by the confining potential in QPCs with in-plane side gates (SGs). Strongly spin-polarized currents can be generated by tuning the asymmetric bias voltages on the side gates. A conductance anomaly in the form of a plateau at conductance G=0.5G0 (where G0 =2e2/h) was observed in the ballistic conductance of a QPC based in the absence of magnetic field – which was established to be a signature of complete spin polarization. A Non-Equilibrium Green’s Function (NEGF) analysis was used to model a small QPC and three ingredients were found to be essential to generate a strong spin polarization: (1) LSOC, (2) an asymmetric lateral confinement, and (3) a strong electron-electron (e-e) interaction. We have also shown that all-electric control of spin polarization can be achieved for different materials, electron mobility, heterostructure design, QPC dimensions and strength of LSOC.
Marc Cahay, Ph.D. (Committee Chair)
Steven T. Herbert, Ph.D. (Committee Member)
Punit Boolchand, Ph.D. (Committee Member)
Altan Ferendeci, Ph.D. (Committee Member)
Peter Kosel, Ph.D. (Committee Member)
121 p.
Electrical Engineering
Quantum point contact; spin orbital coupling; coulomb blockade; spin blockade; spin polarization; side gate

Recommended Citations

Citations

  • Bhandari, N. K. (2014). Tunable All Electric Spin Polarizer [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1393237571

    APA Style (7th edition)

  • Bhandari, Nikhil. Tunable All Electric Spin Polarizer. 2014. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1393237571.

    MLA Style (8th edition)

  • Bhandari, Nikhil. "Tunable All Electric Spin Polarizer." Doctoral dissertation, University of Cincinnati, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1393237571

    Chicago Manual of Style (17th edition)

ucin1393237571
436
© 2014, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.