Gate-Defined Wires in HgTe Quantum Wells: From Majorana Fermions to Spintronics

Gate-Defined Wires in HgTe Quantum Wells: From Majorana Fermions to Spintronics

Blog Article

We introduce a promising new platform for Majorana zero modes and various spintronics applications based on gate-defined wires in HgTe quantum wells.Because of the Dirac-like band structure for Tank Kit HgTe, the physics of such systems differs markedly from that of conventional quantum wires.Most strikingly, we show that the subband parameters for gate-defined HgTe wires exhibit exquisite tunability: Modest gate voltage variation allows one to modulate the Rashba spin-orbit energies from zero up to about 30 K, and the effective g factors from zero up to giant values exceeding 600.

The large achievable Hardware spin-orbit coupling and g factors together allow one to access Majorana modes in this setting at exceptionally low magnetic fields while maintaining robustness against disorder.As an additional benefit, gate-defined wires (in HgTe or other settings) should greatly facilitate the fabrication of networks for refined transport experiments used to detect Majoranas, as well as the realization of non-Abelian statistics and quantum information devices.