Absence of Friedel oscillations in the entanglement entropy profile of one-dimensional intrinsically gapless topological phases

Understand

Topological quantum matter is typically associated with gapped phases and edge modes protected by the bulk gap.

• In contrast, recent work (Phys.
• Rev.
• B 104, 075132) proposed intrinsically gapless topological phases that, in one dimension, carry protected edge modes only when the bulk is a gapless Luttinger liquid.