University of Waterloo
200 University Avenue West
Waterloo, Ontario, Canada N2L 3G1
Phone: (519) 888-4567 ext 32215
Fax: (519) 746-8115
Department of Physics, University at Buffalo, USA
Proximity effects can transform a given material through its adjacent regions to become superconducting, magnetic, or topologically nontrivial, enabling unexplored device opportunities. In bulk materials, the sample size often dwarfs the characteristic lengths of proximity effects allowing their neglect. However, in two-dimensional (2D) materials such as graphene, transition-metal dichalcogenides (TMDs) and 2D electron gas (2DEG), the situation is drastically different, even short-range magnetic proximity effects can exceed their thickness and strongly modify spin transport and optical properties [1,2]. Experimental confirmation by the groups of A. Geim , B. van Wees , and R. Kawakami  of our prediction for bias-controlled spin polarization reversal in Co/h-BN/graphene  suggests that tunable magnetic proximity effects may overcome the usual need for an applied magnetic field and a magnetization reversal to implement the graphene-based spin logic . In TMDs, where robust excitons, bound electron-hole pairs (binding energy > 100 meV), dominate their optical response, magnetic proximity effects cannot be described by the widely used single-particle description, but instead reveal the possibility of a conversion between optically inactive and active excitons by rotating the magnetization of the magnetic substrate . A combination of magnetic and superconducting proximity effects could enable elusive Majorana bounds states (MBS)  for fault-tolerant quantum computing. Unlike Fermions or Bosons, exchanging (braiding) MBS yields a non-commutative phase, a sign of non-Abelian statistics and non-local degrees of freedom protected from local perturbations. Such MBS could be manipulated and braided in proximity-induced superconductivity in a 2DEG with magnetic textures from the fringing fields of magnetic tunnel junctions (MTJs) [8,9], implemented in magnetic hard drives and magnetic random access memory.
 P. Lazić, K. D. Belashchenko, and I. Žutić, Phys. Rev. B 93, 241401(R) (2016).
 B. Scharf, G. Xu, A. Matos-Abiague, and I. Žutić, Phys. Rev. Lett. 119, 127403 (2017)
 P. Asshoff et al., 2D Mater. 4, 031004 (2017).
 M. Gurram, S. Omar, and B. J. van Wees, Nat. Commun. 8, 248 (2017).
 J. Xu, S. Singh, J. Katoch, G. Wu, T. Zhu, I. Žutić, and R. Kawakami, preprint.
 H. Wen et al., Phys. Rev. Appl. 5, 044003 (2016).
 S. Nadj-Perge et al., Science 346, 602 (2014).
 G. L. Fatin, A. Matos-Abiague, B. Scharf, and I. Žutić, Phys. Rev. Lett. 117, 077002 (2016).
 A. Matos-Abiague et al., Solid. State. Commun. 262, 1 (2017).