Interplay of disorder and interactions in a flat-band supporting diamond chain

Understand

We systematically study the effect of disorder and interactions on a quasi-one dimensional diamond chain possessing flat bands.

• Disorder localizes all the single particle eigenstates, while at low disorder strengths we obtain weak flat-band based localization (FBL), at high disorder strengths, we see conventional Anderson localization (AL).
• The compactly localized (CL) eigenstates of flat bands show a persisting oscillatory recurrence in the study of single-particle wavepacket dynamics.
• For low disorder a damped oscillatory recurrence behavior is observed which is absent for high disorder.