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Yoo, Jung-Woo
Functional Hybrid Materials and Devices Lab(FHMDL)
Research Interests
  • Transport properties, spintronics, organic/molucular magnet, electronic, and spintronics,
  • 2DEG, energy harvesting device, atomic/molecular layer deposition

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Nonvolatile tuning of the spin-orbit coupling in graphene by a ferroelectric dipole

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Title
Nonvolatile tuning of the spin-orbit coupling in graphene by a ferroelectric dipole
Author
Park, JungminChoi, JonghyeonOh, InseonLee, Ah-YeonAhn, Chang WonKoo, SeulgiYoo, Jung-WooJo, Younghun
Issue Date
2020-11
Publisher
American Institute of Physics
Citation
APPLIED PHYSICS LETTERS, v.117, no.1, pp.203101
Abstract
Spin–orbit coupling (SOC) offers an alternative technique for generating pure spin currents in non-magnetic materials and controlling spin precessions for spin-field effect transistors. In addition, introducing SOC into graphene causes pristine graphene to evolve into a new condensed matter phase, such as the topological insulator state (quantum spin Hall state). Thus, the control of SOC in graphene is essential for its functional spin-orbitronic applications. Here, we report the nonvolatile tuning of SOC in graphene through the proximity effect from a ferroelectric substrate, Pb(Zr52,Ti48)O3 (PZT). Ferroelectric poling by applying a gate voltage induces a change in the SOC strength in addition to shifting the charge neutral point in graphene. The variations in SOC were extracted from weak localization within the quantum interference theory of graphene. Our analyses show that the dipole moments from the PZT polarization significantly enhance the z → −z asymmetric and symmetric SOCs of graphene. Unlike the impurity doping and/or gating, our methodology leads to the nonvolatile electrical control of SOC, thereby paving the way for versatile spin-orbitronic applications of graphene.
URI
https://scholarworks.unist.ac.kr/handle/201301/49021
URL
https://aip.scitation.org/doi/abs/10.1063/5.0030149
DOI
10.1063/5.0030149
ISSN
0003-6951
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