Toward exploring multichannel charge Kondo effects for investigating quantum criticality

Recent proposals^[1,2] have demonstrated a non-Fermi liquid fixed point in superconducting and topological superconducting islands, analogous to the charge Kondo effect in normal metallic islands. The topological Kondo effect is predicted to be robust against channel detuning and to have a heightened crossover temperature when tuned to charge degeneracy, making this an especially attractive regime for investigating quantum criticality and for demonstrating nonlocal quantum phenomena through Majorana modes. I will talk about our efforts in experimentally realizing new multichannel charge Kondo devices on InAs 2DEG platforms.

[1] M. Pustilnik, et al., Phys. Rev. Lett. 119, 116802 (2017).
[2] K. Michaeli, et al., Phys. Rev. B 96, 205403 (2017).