Question: What is the type of particle of the concept that was proposed by the Soviet physicist who also discovered the theory of superfluidity?
Sentence (from "Polaron"): The polaron concept was first proposed by Lev Landau in 1933 to describe an electron moving in a dielectric crystal where the atoms move from their equilibrium positions to effectively screen the charge of an electron, known as a phonon cloud.
Relevant evidence: Yes