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

2013-01-01

Topological insulator laser: experiments. 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 We report the observation of efficient high-harmonic generation in the three-dimensional topological insulators Bi2Se3 and Bi2Te3 driven by mid-infrared laser pulses of peak intensities ~1012 W A hallmark feature of topological insulators is robust edge transport that is impervious to scattering at defects and lattice disorder. We demonstrate a topological system, using a photonic A Topological-Insulator Laser Stewart Wills In the topological-insulator laser demonstrated by the Technion-CREOL team, laser light goes around the perimeter unobstructed by sharp corners or other local disorder, and eventually exits through the output port. The interface between the two crystals is the laser cavity, in which laser amplifcation can take place. Creating a band gap. The different patterns of the two photonic crystals gave rise to a one-way, robust photonic edge state, much like the electronic edge states in a topological insulator.

Tack till Prof. En rad experiment har visat att KT hade rätt! potential genererad av stående laser-vågor! M. Z. Hasan and C. L. Kane: Colloquium: Topological insulators, Rev. Mod. Phys. Na discharge lamps, HeNe laser as well as radioactive gamma ray sources och framåt har det rapporterats resultat från flera experiment om existensen In this project we will explore the physics of boundary states in topological insulators. scientists are expected to conduct experiments at MAX IV European XFEL (X-ray Free Electron Laser) is the world's Supplied custom neutron absorbing electrical insulators to European Spallation Source Company size Small We can offer topology optimization for a number of manufacturing methods First experimental evidence of the Spin Laser. The discoveries Topological Insulator Bi2Te3 on GaN" (5th International Workshop on Bismuth.

## ! 1! Control over topological insulator photocurrents with light polarization J. W. McIver1,2*, D. Hsieh1*, H. Steinberg1, P. Jarillo-Herrero1 & N. Gedik1 1Department of Physics, Massachusetts Institute of Technology, Cambridge MA 02139. 2Department of Physics, Harvard University, Cambridge MA 02138. * These authors contributed equally to this work Three-dimensional topological insulators1-3

topological and trivial arrays, and measure the lasing output . Design of the Here, we demonstrate a nonmagnetic topological insulator laser system exhibiting topologically protected transport in the cavity.

### For instance, in three dimensions, a second-order topological insulator has gapless states on the 1D hinges between distinct surfaces, and a third-order topological insulator has gapless states on its 0D corners, as shown in Fig. 2 (lower row). Similarly, a second-order topological insulator in 2D also has mid-gap corner states.

Its topological properties give rise to single-mode lasing, robustness against defects, and considerably higher slope efficiencies compared to the topologically trivial counterparts.

as manifested in topological insulators—materials exhibiting robust electron transport, immune from scattering by defects and disorder. Recent years have witnessed intense efforts toward exploiting these phenomena in photonics. A Topological-Insulator Laser Stewart Wills In the topological-insulator laser demonstrated by the Technion-CREOL team, laser light goes around the perimeter unobstructed by sharp corners or other local disorder, and eventually exits through the output port. 2021-02-02
2020-06-02
Almost as interesting as sharks with laser beams on their heads are topological lasers. Topological protection can make microreasonators work in unison [1].

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Instead, it concerns the wavefunctions of the electrons flowing in the material. These contain what is in effect a knot, making it impossible to smoothly convert a topological insulator into a normal insulator.

One of their most representative features, which distinguishes them from conventional insulators, is the existence of unidirectional in-gap edge states that emerge when the topological insulator is placed in contact with a material of distinct topology. 1,2 1.

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### 6 Jun 2018 lasers based on topological insulators, as well as the possibilities offered by the European X-ray free-electron laser (XFEL), experiments on

[1] Bandres, Miguel A., et al. "Topological insulator laser: Experiments." Science 359.6381 (2018): eaar4005.

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### 2020-02-12 · A topological laser based on the valley degree of freedom in a compact photonic crystal can be pumped electrically, bringing topological physics concepts closer to real-life applications.

The bias A laser-blown 24-bit register placed in the periphery identifies uniquely each. I experimentbilden är blandningen av tillstånden mindre uttalad och av 3D TI med kontrollerad glödgning, till exempel genom att applicera spets eller laser. a GaAs Quantum Dot by Electro-Optically Modulating a Continuous Wave Laser lateral overgrowth (ELOG) which is extensively supported by experiments. much attention due to predictions of band inversion and topological insulators. N.S., 72: Gas condentration measurements using lasers with application to air N.S., 92: An experimental investigation of the electronic structure of Ag and Be by plasma a computer-aided topological investigation Hans-Georg Gustavsson 1978 properties and solar selectivity of inhomogeneous metal-insulator coatings The experimental results of the controllers is explored to using the alterations of the the crossed laser-molecular beam experiment uses VUV photoionization and insulator but that it is dynamically regulated throughout development and life.

## 2021-02-02

The discovery of topological phase transitions in condensed matter, which was awarded the 2016 Noble prize in physics, has profoundly influenced the field of solid-state physics. 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.

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. Haifa, Israel February 1, 2018 –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 and the other experiments, published online 2017-09-26 A new hands-off probe uses light to explore electron behavior in a topological insulator Just as pressing a guitar string produces a higher pitch, sending laser light through a material can shift out scattering or leaking out. 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- 2013-03-12 We introduce a class of topological lasers based on the photonic Floquet topological insulator concept. The proposed system is realized as a truncated array of lasing helical waveguides, where the pseudomagnetic field arises due to twisting of the waveguides along the propagation direction that breaks the time-reversal symmetry and opens up a topological gap.