Interlayer excitonic insulator in two-dimensional double-layer semiconductor junctions: An explicitly solvable model
arXiv:2207.03501 · doi:10.1103/PhysRevB.106.125311
Abstract
Excitonic insulators conduct neither electrons nor holes but bound electron-hole pairs, excitons. Unfortunately, it is not possible to inject and detect the electron and hole currents independently within a single semiconducting layer. However, interlayer excitonic insulators provide a spatial separation of electrons and holes enabling exciton current measurements. The problem is that the spatial separation weakens electron-hole pairing and may lead to interlayer exciton disassociation. Here we develop an explicitly solvable model to determine an interlayer separation that is strong enough to prevent electron and hole hopping across the layers but still allows for electron-hole pairing sufficient for transition into an interlayer excitonic insulator state. An ideal junction to realize such a state would comprise a pair of identical narrow-gap two-dimensional semiconductors separated by a wide-gap dielectric layer with low dielectric permittivity. The present study quantifies parameters of such a junction by taking into account interlayer coherence effects.
arXiv comment7 pages, 4 figures
References in corpus (27)
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- k.p theory for two-dimensional transition metal dichalcogenide semiconductors
- Bose-Einstein Condensation of Excitons in Bilayer Electron Systems
- Ultrafast Dynamics of Defect-Assisted Electron-Hole Recombination in Monolayer MoS2
- Evidence for an excitonic insulator phase in 1T-TiSe
- Band Alignment of 2D Semiconductors for Designing Heterostructures with Momentum Space Matching
- Exciton condensate in semiconductor quantum well structures.
- Strongly correlated excitonic insulator in atomic double layers
- TiS3 transistors with tailored morphology and electrical properties
- How to make a bilayer exciton condensate flow
- Gate-Tuned Spontaneous Exciton Insulator in Double-Quantum Wells
- Ultrafast Electronic Band Gap Control in an Excitonic Insulator
- Drag in paired electron-hole layers
- Correlated interlayer exciton insulator in double layers of monolayer WSe2 and moiré WS2/WSe2
- Models of coherent exciton condensation
- Interaction-Enhanced Coherence Between Two-Dimensional Dirac Layers
- Stable charge density wave phase in a 1T-TiSe monolayer
- Manipulating charge-density-wave in monolayer -TiSe by strain and charge doping: A first-principles investigation
- Bilayer WSe as a natural platform for interlayer exciton condensates in the strong coupling limit
- Engineering Superfluidity in Electron-Hole Double Layers
- Electrical Reservoirs for Bilayer Excitons
- Anisotropic features in the electronic structure of the two-dimensional transition metal trichalcogenide TiS: electron doping and plasmons
- Multi-terminal electronic transport in boron nitride encapsulated TiS nanosheets
- Tightly bound excitons in two-dimensional semiconductors with a flat valence band
- Revisiting double Dirac delta potential
- Metal-insulator transitions in bilayer electron-hole systems in transition metal dicalcogenides
- High-temperature tunable superfluidity of polaritons in Xene monolayers in an optical microcavity