A5057120268- Topological Materials and Phenomena
- Graphene research and applications
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Diamond and Carbon-based Materials Research
- Atomic and Subatomic Physics Research
- 2D Materials and Applications
- Magnetic properties of thin films
- Quantum, superfluid, helium dynamics
University of Luxembourg
2023-2024
Institute for Cross-Disciplinary Physics and Complex Systems
2023-2024
University of Milan
2022
Topological phononic insulators are the counterpart of three-dimensional quantum spin Hall in systems and, as such, their topological surfaces characterized by Dirac cone-shaped gapless edge states arising a consequence bulk-boundary correspondence. We propose theoretical framework for possible superconducting phase these materials, where attractive interaction between electrons is mediated phonons nontrivial boundary modes. Within BCS limit, we develop self-consistent two-band gap equation,...
Heterostructures of magnetic topological insulators (MTIs) and superconductors (SCs) in two-dimensional (2D) slab one-dimensional (1D) nanoribbon geometries have been predicted to host, respectively, chiral Majorana edge states (CMESs) bound (MBSs). We study the properties such MTI/SC heterostructures upon variation geometry from wide slabs quasi-1D systems as a function chemical potential, doping, induced superconducting pairing potential. To do so, we construct effective...
We develop an accurate nanoelectronic modeling approach for realistic three-dimensional topological insulator nanostructures and investigate their low-energy surface-state spectrum. Starting from the commonly considered four-band $\mathrm{k}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{p}$ bulk model Hamiltonian ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ family of insulators, we derive new parameter sets ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}, {\mathrm{Bi}}_{2}{\mathrm{Te}}_{3},$...
We theoretically discuss electronic transport via Majorana states in magnetic topological insulator-superconductor junctions with an asymmetric split of the applied bias voltage. study normal-superconductor-normal (NSN) made narrow (wirelike) or wide (filmlike) insulator slabs a central proximitized superconducting sector. The occurrence charge-nonconserving Andreev processes entails nonzero conductance related to electric current flowing ground from sector NSN junction. show that...
We develop an accurate nanoelectronic modeling approach for realistic three-dimensional topological insulator nanostructures and investigate their low-energy surface-state spectrum. Starting from the commonly considered four-band $\boldsymbol{\mathrm{k\cdot p}}$ bulk model Hamiltonian Bi$_2$Se$_3$ family of insulators, we derive new parameter sets Bi$_2$Se$_3$, Bi$_2$Te$_3$ Sb$_2$Te$_3$. consider a fitting strategy applied to \emph{ab initio} band structures around $\Gamma$ point that...
Heterostructures of magnetic topological insulators (MTIs) and superconductors (SCs) in two-dimensional (2D) slab one-dimensional (1D) nanoribbon geometries have been predicted to host, respectively, chiral Majorana edge states (CMESs) bound (MBSs). We study the properties such MTI/SC heterostructures upon variation geometry from wide slabs quasi-1D systems as a function chemical potential, doping, induced superconducting pairing potential. To do so, we construct effective...
We theoretically discuss electronic transport via Majorana states in magnetic topological insulator-superconductor junctions with an asymmetric split of the applied bias voltage. study normal-superconductor-normal (NSN) made narrow (wire-like) or wide (film-like) insulator slabs a central proximitized superconducting sector. The occurrence charge non-conserving Andreev processes entails nonzero conductance related to electric current flowing ground from sector NSN junction. show that...
Abstract The chiral topological superconductor, which supports propagating nontrivial edge modes while maintaining a gapped bulk, can be realized hybridizing quantum-anomalous-Hall thin slab with an ordinary s -wave superconductor. We show that by sweeping the voltage bias in normal-hybrid-normal double junction, pattern of electric currents normal leads spans three main regimes. From single-mode edge-current quantization at low bias, to double-mode oscillations intermediate voltages and up...