Majorana’s on the Move
Majorana particles, excitations which are their own anti-particle, have gained much attention for their potential in topological quantum computing. Previously realized as 0D excitations in superconducting vortices, they have also been theorized to exist in 1D inside of topological supercoductors. Recently we have observed the signature of 1D majorana modes at domain walls in FeSe0.45Te0.55, where a π phase shift in the superconducting order parameter hosts these exotic states.
Electrons stuck in 1D
In the material TaS2, a Mott Insulating phase is closely related to a coexisting “Star of David” charge density wave. On a specific charge density wave domain wall, the local electronic potential well is strong enough to shift the lower Hubbard band all the way to the Fermi energy. The strong electronic correlations in this material combined with the low electron density along the domain wall present the perfect conditions for Wigner crystallization. When measuring the differential conductance, a proxy for the local density of states, we see zigzag patterns predicted for Wigner crystallization in 1D. Combined with noise measurements, this provides the first experimental observation of a 1D Wigner crystal within a Mott Insulator.