Probing the Topological Phase Transition via Density Oscillations in Silicene and Germanene

Abstract

We theoretically investigated two kinds of density oscillations: the Friedel oscillation and collective excitation in the silicene and germanene within random phase approximation, and found that the tunable spin-valley coupled band structure could lead to some exotic properties in such two phenomena. Based on the exact analytical and numerical analysis, we demonstrated that the beating of screened potential as well as the undamped plasmon mode can be taken as fingerprints of topological phase transition in doped silicene and doped germanene. Thus our proposal here establishes the connection between the topological phase transition and the density oscillations that can be accessed by a variety of experimental techniques.

5 pages main text + 5 pages supplementary material; References added; slight changes in text

References in corpus (12)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Graphene plasmonics
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• Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
• Electronic structure of silicon-based nanostructures
• The Role of Electron-electron Interactions in Graphene ARPES Spectra
• Dynamical polarization, screening, and plasmons in gapped graphene
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Cited by in corpus (29)

• Dirac node lines in pure alkali earth metals
• Plasmonics with two-dimensional semiconductors "beyond graphene": from basic research to technological applications
• Spin and valley polarization of plasmons in silicene due to external fields
• Topological phase and edge states dependence of the RKKY interaction in zigzag silicene nanoribbon
• Anisotropic longitudinal optical conductivities of tilted Dirac bands in 1T${}^{\prime }$-MoS${}_2$
• Plasmon properties and hybridization effects in Silicene
• Plasmon modes of a massive Dirac plasma, and their superlattices
• Dynamical polarizability, screening, and plasmons in one, two, and three dimensional massive Dirac systems
• Tunable Intrinsic Plasmons due to Band Inversion in Topological Materials
• Magnetic Properties of Dirac Fermions in a Buckled Honeycomb Lattice
• Detection of topological phase transitions through entropy measurements: the case of germanene
• Collective plasmonic excitations in double-layer silicene at finite temperature
• Coulomb scattering rates of excited states in germanene
• Interband $\pi$-like plasmon in silicene grown on silver
• Plasmons in a two-dimensional nonsymmorphic nodal-line semimetal
• Anisotropic Friedel oscillations in graphene-like materials: The Dirac point approximation in wave-number dependent quantities revisited
• Relaxation times and charge conductivity of silicene
• Beating pattern in quantum magnetotransport coefficients of spin-orbit coupled Dirac fermions in gated silicene
• Entropy Signatures of Topological Phase Transitions
• Interband and intraband transition, dynamical polarization and screening of the monolayer and bilayer silicene in low-energy tight-binding model
• Graphene Electrodynamics in the presence of the Extrinsic Spin Hall Effect
• Collective modes in a Dirac insulator with short range interactions
• Dynamical spin-spin susceptibility of Silicene
• Electrically tunable magnetoplasmons in a monolayer of silicene or germanene
• Two-dimensional parabolic Dirac system in the presence of non-magnetic and magnetic impurities
• Effects of electron-impurity scattering on density of states in silicene: impurity bands and band-gap narrowing
• Detection of topological states in two-dimensional Dirac systems by the dynamic spin susceptibility
• Enhanced interaction effects in the vicinity of the topological transition
• Probing topological phase transition in silicene via Klein tunneling in a normal/ferromagnetic/normal silicene junction