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Observation of Majorana fermions in ferromagnetic atomic chains on a superconductor
TLDR
High-resolution spectroscopic imaging techniques show that the onset of superconductivity, which gaps the electronic density of states in the bulk of the Fe chains, is accompanied by the appearance of zero-energy end-states, providing strong evidence for the formation of a topological phase and edge-bound Majorana fermions in atomic chains.
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Topological Anderson insulator.
TLDR
The role of disorder is investigated in the context of the recently discovered topological insulator, which possesses a pair of helical edge states with opposing spins moving in opposite directions and exhibits the phenomenon of quantum spin Hall effect.
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Distinguishing a Majorana zero mode using spin-resolved measurements
TLDR
This study establishes spin-polarization measurements as a diagnostic tool to distinguish topological MZMs from trivial in-gap states of a superconductor.
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Gate-tuned normal and superconducting transport at the surface of a topological insulator
TLDR
This work studies transport through superconducting junctions fabricated on thin Bi2Se3 single crystals, equipped with a gate electrode, to demonstrate how gated nano-electronic devices give control over normal andsuperconducting transport of Dirac fermions at an individual surface of a three-dimensional topological insulators.
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Topological superconductivity induced by ferromagnetic metal chains
Recent experiments have provided evidence that one-dimensional (1D) topological superconductivity can be realized experimentally by placing transition-metal atoms that form a ferromagnetic chain on a…
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Higher-Order Topology, Monopole Nodal Lines, and the Origin of Large Fermi Arcs in Transition Metal Dichalcogenides XTe_{2} (X=Mo,W).
TLDR
This Letter calculates the bulk and surface electronic structure of β- and γ-MoTe_{2) and confirms that MNLSMs driven by double band inversion are the weak-spin-orbit coupling limit of HOTIs, implying that MN LSMs are higher-order topological semimetals with flat-band-like hinge states, which are found to originate from the corner modes of 2D "fragile" TIs.
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Marginality of bulk-edge correspondence for single-valley Hamiltonians
We study the correspondence between the nontrivial topological properties associated with the individual valleys of gapped bilayer graphene (BLG), as a prototypical multivalley system, and the…
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Observation of the Quantum Anomalous Hall Insulator to Anderson Insulator Quantum Phase Transition and its Scaling Behavior.
TLDR
This work reports on the experimental observation of a quantum phase transition from a quantum-anomalous-Hall insulator to an Anderson insulator in a magnetic topological insulator by tuning the chemical potential.
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High-resolution studies of the Majorana atomic chain platform
High-resolution scanning tunnelling microscopy measurements show that chains of magnetic atoms on the surface of a superconductor provide a promising platform for realizing and manipulating Majorana…
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Observation of a Majorana zero mode in a topologically protected edge channel
TLDR
Signatures of Majorana zero modes on helical hinge states in a higher-order topological insulator are observed and the MZM’s spin signature is resolved, which distinguishes it from trivial in-gap states that may accidentally occur at zero energy in a superconductor.
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