Zero temperature superconductor–edge metal–insulator transition in two-dimensional bosonic systems

Håvard H. Haugen; Asle Sudbø

doi:10.1103/PhysRevB.106.064504

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Zero temperature superconductor–edge metal–insulator transition in two-dimensional bosonic systems

Håvard H. Haugen, Asle Sudbø

DOI 10.1103/PhysRevB.106.064504 · Physical Review B

T1

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Abstract

Motivated by the recent experimental observation of an intermediate bosonic metallic state in the two-dimensional superconductor-insulator transition at T=0, we study an extended Bose-Hubbard model in the limit of a large number of particles per site. Using a representation of this in terms of two coupled XY models, we find, in addition to an insulating phase and a (2+1)D superfluid phase, two other phases. One phase is a 2D superfluid phase where a crossover from (2+1)D to 2D has taken place as a result of incipient charge ordering, signaled by θ disordering, and which is closely related to a supersolid phase. The other new phase is an edge metal state characterized by zero superfluid stiffness, zero charge ordering, and zero bulk compressibility. However, the edge compressibility of the system is nonzero. While we do not find any intermediate state with 2D metallic conductivity, we are able to connect these results to STM experiments on MoS2 showing brims of finite density of states around the entire edge of 2D MoS2 samples.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MoS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
TaN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
InO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown