Spintronics and pseudospintronics in graphene and topological insulators.

By D. Pesin, Allan H. MacDonald. Nature Materials, 2012

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The two-dimensional electron systems in graphene and in topological insulators are described by massless Dirac equations. Although the two systems have similar Hamiltonians, they are polar opposites in terms of spin-orbit coupling strength. We briefly review the status of efforts to achieve long spin-relaxation times in graphene with its weak spin-orbit coupling, and to achieve large current-induced spin polarizations in topological-insulator surface states that have strong spin-orbit coupling. We also comment on differences between the magnetic responses and dilute-moment coupling properties of the two systems, and on the pseudospin analogue of giant magnetoresistance in bilayer graphene.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry, Physical and Theoretical Chemistry

View Paper: https://www.semanticscholar.org/paper/447039afead15fe5eb7cef0aa5c190a1d4175513

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Citations in the corpus

Colloquium : Spintronics in graphene and other two-dimensional materials (2019, background): “…Wolf et al., 2006; Žutić et al., 2004), graphene (Castro Neto et al., 2009; Das Sarma et al., 2011; Peres, 2010), and graphene spintronics (Garcia et al., 2018; Gurram et al., 2018; Han et al., 2012; Pesin and MacDonald, 2012; Roche and Valenzuela, 2014; Seneor et al., 2012; Shiraishi, 2012).”
New perspectives for Rashba spin-orbit coupling. (2015, background): “Therefore, it may not be continuous at the interfaces between different materials [142].”
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems (2018, background): “…der Bijl and Duine, 2012; Kim et al., 2013b, 2012b; Lee et al., 2015; Manchon and Zhang, 2008; Matos-Abiague and Rodriguez-Suárez, 2009; Tan et al., 2007), or quantummechanical Kubo formula approaches (Li et al., 2015; Pesin and MacDonald, 2012a; Qaiumzadeh et al., 2015; Wang et al., 2012b, 2014).”
Two-dimensional magnetic crystals and emergent heterostructure devices (2019, background): “, infinitely long) ferromagnetic order is not allowed in 1D systems, it is possible to make magnetically ordered chains with finite length and width, so that the finitesize ferromagnets (29–31) behave as spin blocks of superparamagnets with reasonably long spin flipping time, which can provide a pra”
Basic principles of STT-MRAM cell operation in memory arrays (2013, background): “having large spin-diffusion length [104, 106] or enabling easy generation of the spin polarization [105].”
Interface-Induced Phenomena in Magnetism (2016, positive): “As discussed briefly above, spin-textured surface electron states of 3D topological insulators provide a means of generating spin transfer torque in a neighboring ferromagnet [Culcer et al., 2010; Mahfouzi et al., 2012; Pesin and MacDonald, 2012].”