Effects of parallel electric and magnetic fields on Rydberg excitons in buckled two-dimensional materials

Abstract

We study direct and indirect magnetoexcitons in Rydberg states in monolayers and double-layer heterostructures of Xenes (silicene, germanene, and stanene) in external parallel electric and magnetic fields, applied perpendicular to the monolayer and heterostructure. We calculate binding energies of magnetoexcitons for the Rydberg states 1$s$, 2$s$, 3$s$, and 4$s$, by numerical integration of the Schrödinger equation using the Rytova-Keldysh potential for direct magnetoexciton and both the Rytova-Keldysh and Coulomb potentials for indirect excitons. Latter allows understanding a role of screening in Xenes. In the external perpendicular electric field, the buckled structure of the Xene monolayers leads to appearance of potential difference between sublattices allowing to tune electron and hole masses and, therefore, the binding energies and diamagnetic coefficients (DMCs) of magnetoexcitons. We report the energy contribution from electric and magnetic fields to the binding energies and DMCs. The tunability of the energy contribution of direct and indirect magnetoexcitons by electric and magnetic fields is demonstrated. It is also shown that DMCs of direct excitons can be tuned by the electric field, and the DMCs of indirect magnetoexcitons can be tuned by the electric field and manipulated by the number of h-BN layers. Therefore, these allowing the possibility of electronic devices design that can be controlled by external electric and magnetic fields and the number of h-BN layers. The calculations of the binding energies and DMCs of magnetoexcitons in Xenes monolayers and heterostructures are novel and can be compared with the experimental results when they will be available.

20 pages, 9 figures

References in corpus (23)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• 2D materials and van der Waals heterostructures
• Germanene: a novel two-dimensional Germanium allotrope akin to Graphene and Silicene
• Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
• Breaking of valley degeneracy by magnetic field in monolayer MoSe2
• High-temperature superfluidity with indirect excitons in van der Waals heterostructures
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Dark excitons in transition metal dichalcogenides
• Spin-Valley Optical Selection Rule and Strong Circular Dichroism in Silicene
• Optical Signatures of the Tunable Band Gap and Valley-Spin Coupling in Silicene
• Excitonic valley effects in monolayer WS${}_2$ under high magnetic fields
• Optical spectroscopy of excited exciton states in MoS2 monolayers in van der Waals heterostructures
• Magneto-photoluminescence of exciton Rydberg states in monolayer WSe${}_2$
• Luminescent emission of excited Rydberg excitons from monolayer WSe2
• Towards superfluidity of dipolar excitons in a TMDC double layer
• Quantum Hall Effects in Silicene
• Ground and Excited Exciton Polarons in Monolayer MoSe2
• Silicene Nanomesh
• Landau levels and magnetic oscillations in gapped Dirac materials with intrinsic Rashba interaction
• Gate-tunable exciton-polaron Rydberg series with strong roton effect

Cited by in corpus (6)

• Magnetoexcitons in transition-metal dichalcogenides monolayers, bilayers, and van der Waals heterostructures
• Anisotropic linear and non-linear excitonic optical properties of buckled monolayer semiconductors
• Magnetoexcitons in phosphorene monolayers, bilayers, and van der Waals heterostructures
• Tunable nonlinear excitonic optical response in biased bilayer graphene
• Excitonic optical absorption in strained monolayer CrSBr
• Electric field tunable magnetoexcitons in Xenes-hBN-TMDC, Xenes-hBN-BP, and Xenes-hBN-TMTC heterostructures