# topologiska fasövergångar - Linköping University - Linköpings

Near-Field-Mediated Photon-Electron Interactions - Nahid

• Due to the spin texture, back scattering is still forbidden. Bandres, M. A. et al. Topological insulator laser: experiments. Science 359, eaar4005 (2018).

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A topological insulator is a material that behaves as an insulator in its interior but whose surface contains conducting states, meaning that electrons can only move along the surface of the material. Topological insulators have non-trivial symmetry-protected topological order; however, having a conducting surface is not unique to topological insulators, since ordinary band insulators can also support conductive surface states. What is special about topological insulators is that topological insulator phase compared to the trivial insulator. Keywords: topological insulator, terahertz radiation, photoelectromagnetic effect (Some ﬁgures may appear in colour only in the online journal) 1. Introduction Three-dimensional topological insulators (TI) belong to a fascinating class of quantum matter and display fundamen- Topological photonics provides a novel route for designing and realizing optical devices with unprecedented functionalities. Topological edge states, which are supported at the boundary of two photonic systems with different band topologies, enable robust light transport immune to structural imperfections and/or sharp bends in waveguides. out scattering or leaking out.

## topologiska fasövergångar - Linköping University - Linköpings

Topological insulator laser part II: experiments. Science 359, aar4005 (2018). Article Google Scholar 33.

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In a recent experiment [8], a topological insulator laser has been realized, which is based on a square lattice of coupled semiconductor mi-croring resonators with a synthetic magnetic ﬁeld realized by antiresonant ring links [10,11]. The experiment nicely showed that in the topological insulator laser the syn- A similar idea underpins topological insulators, but the transformation in this case doesn’t involve a material’s spatial properties. Instead, it concerns the wavefunctions of the electrons flowing in the material.

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Experiments have given evidence for topological phases in 1D and 2D NH systems, but researchers have yet to place these results in a broader context that might reveal other NH topological systems. Zongping Gong from the University of Tokyo and colleagues present a new general framework for classifying topological phases of non-Hermitian systems [ 1 ]. 2015-09-03 · While the general concept behind topological superconductivity predates topological insulators [121–124], recent considerations of topological band theory and related invariant structures can be used to topologically classify superconductors that are direct analogs of topological insulators (for reviews, see [3, 7, 125, 126]). A topological insulator is a material that behaves as an insulator in its interior but whose surface contains conducting states, meaning that electrons can only move along the surface of the material. Topological insulators have non-trivial symmetry-protected topological order; however, having a conducting surface is not unique to topological insulators, since ordinary band insulators can also support conductive surface states. What is special about topological insulators is that
topological insulator phase compared to the trivial insulator.

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Here, we demonstrate persistent, micron-scale optical control of both magnetization and chemical potential in Cr-(Bi,Sb)2Te3 grown on SrTiO3.

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### Experimental Methods for Spin- and Angle-Resolved - JoVE

Topological insulator laser: theory. Science 359, eaar4003 (2018). Article Google Scholar 16. Bandres, M. A. et al. Topological insulator laser: experiments. Israeli and US researchers have developed a new, highly efficient coherent and robust semiconductor laser system: the topological insulator laser.

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Time- 22 Dec 2020 Several years later, photonic topological insulators manifested as topologically protected edge Topological insulator laser: experiments.

Recent experiments, which in great agreement with theoretical predic-tions, con rm that. In this review, we rst brie y review topological insulators’ theory and get some intuition what topology state means, and then construct basic 2015-09-03 On the technological side, the topological insulator laser provides a route to make many semiconductor lasers to operate as a single-mode high-power laser, while coupled efficiently into an output (Nanowerk News) Israeli and US researchers have developed a new, highly efficient coherent and robust semiconductor laser system: the topological insulator laser. The findings are presented in two new joint research papers, one describing theory ( "Topological insulator laser: Theory" ) and the other experiments ( "Topological insulator laser: Experiments" ), published online today by the prestigious journal Science . Applying topological physics to lasing creates more highly efficient and robust lasers.