Miniband engineering and topological phase transitions in topological - normal insulator superlattices
arXiv:2105.14595 · doi:10.1103/PhysRevB.103.235302
Abstract
Periodic stacking of topologically trivial and non-trivial layers with opposite symmetry of the valence and conduction bands induces topological interface states that, in the strong coupling limit, hybridize both across the topological and normal insulator layers. Using band structure engineering, such superlattices can be effectively realized using the IV-VI lead tin chalcogenides. This leads to emergent minibands with a tunable topology as demonstrated both by theory and experiments. The topological minibands are proven by magneto-optical spectroscopy, revealing Landau level transitions both at the center and edges of the artificial superlattice mini Brillouin zone. Their topological character is identified by the topological phase transitions within the minibands observed as a function of temperature. The critical temperature of this transition as well as the miniband gap and miniband width can be precisely controlled by the layer thicknesses and compositions. This witnesses the generation of a new fully tunable quasi-3D topological state that provides a template for realization of magnetic Weyl semimetals and other strongly interacting topological phases.
arXiv comment21 pages, 8 figures
References in corpus (30)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
- Weyl Semimetal in a Topological Insulator Multilayer
- Quantized Anomalous Hall Effect in Magnetic Topological Insulators
- Topological Crystalline Insulators
- Topological nodal semimetals
- Intrinsic quantized anomalous Hall effect in a moiré heterostructure
- Topological Crystalline Insulators in the SnTe Material Class
- Topological crystalline insulator states in Pb(1-x)Sn(x)Se
- Quantum Anomalous Hall Effect in HgMnTe Quantum Wells
- Topological Crystalline Insulators and Topological Superconductors: From Concepts to Materials
- A topological crystalline insulator (TCI) phase via topological phase transition and crystalline mirror symmetry
- Massive Dirac fermions and spin physics in an ultrathin film of topological insulator
- Large magnetic gap at the Dirac point in a Mn-induced BiTe heterostructure
- Weyl superconductors
- Strain-induced partially flat band, helical snake states, and interface superconductivity in topological crystalline insulators
- Electronic states and optical properties of PbSe nanorods and nanowires
- Experimental observation of Dirac-like surface states and topological phase transition in PbSnTe(111) films
- Magnetized Topological Insulator Multilayers
- Volkov-Pankratov states in topological heterojunctions
- Dynamical Axion Field in a Magnetic Topological Insulator Superlattice
- Topological semimetals in the SnTe material class: Nodal lines and Weyl points
- Dirac parameters and topological phase diagram of Pb1-xSnxSe from magneto-spectroscopy
- PbTe/PbSnTe heterostructures as analogs of topological insulators
- Tunable Dirac interface states in topological superlattices
- Dirac quantum well engineering on the surface of topological insulator
- Engineering artificial topological phases via superlattices
- Designer topological insulator with enhanced gap and suppressed bulk conduction in Bi2Se3/Sb2Te3 ultra-short period superlattices
- Magnetic Weyl and Dirac Kondo semimetal phases in heterostructures
- One dimensional massless Dirac bands in semiconductor superlattices