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effective spin interactions in antiferromagnets by short laser pulses and paves of antiferromagnet from one side and Weyl semimetal or topological insulator

Bismuth in its pure state, is a semimetal with a small electronic band gap. 2018-11-22 · Recently, topological microcavity lasers designed based on the bulk-edge correspondence have been demonstrated 4, 5, 6, 21, 22. While the topological microcavities exhibited single-mode lasing, the We propose a system that exploits the fundamental features of topological photonics and synthetic dimensions to force many semiconductor laser resonators to synchronize, mutually lock, and under suitable modulation emit a train of transform-limited mode-locked pulses. 2019-10-29 · Floquet topological insulator laser Sergey K. Ivanov, Yiqi Zhang, Yaroslav V. Kartashov, Dmitry V. Skryabin (Submitted on 29 Oct 2019) We introduce a class of topological lasers based on the photonic Floquet topological insulator concept.

engine. dye-laser. Gate Tunable Relativistic Mass and Berry's phase in Topological Insulator ( c ) Ett representativt Ramanspektrum (uppmätt med en 532 nm laser) som visar En ny mättbar absorberare (SA) tillverkades genom att belägga den topologiska isolatorns (TI) film på mikrofiber med användning av pulserad laseravsättning Topological insulator laser: Theory | Science #9. IRONMAN 70.3 World Championship - Nice, France by pic. Michael I of Romania - Wikipedia.

Our result indicates that like the atomic layer graphene, the topological insulator Bi2Se3 could also operate as an effective saturable absorber for the passive mode locking of lasers at the telecommunication band.

(a) The photonic array consists of modulated rings, in the form of two independent rows connected by two side resonators. The blue and white staggered pattern indicates the different pumping schemes. The topological insulator studied in the latest work by Ghimire and colleagues at SLAC and Stanford University, USA, is made from the semiconductor bismuth selenide. The heavy bismuth atoms provide a strong spin-orbital force, while time-reversal symmetry is protected by what Ghimire describes as the material’s nondegenerate surface bands.

Our topological insulator laser system is an aperiodic array of 10 unit cell–by–10 unit cell coupled ring resonators on an InGaAsP quantum wells platform. The active lattice uses the topological

Top view photograph of the intensity lasing pattern of the topological insulator laser.

[Google Scholar] Wang Q. et al. Wide spectral and wavelength-tunable dissipative soliton fiber laser with topological insulator nano-sheets self-assembly films sandwiched by PMMA Fig. 2: Illustration of the topological insulator laser: the light goes around the perimeter unobstructed by sharp corner or disorder, and eventually exits through the output port. 6. Posted: Feb 01, 2018: Future of semiconductor lasing: Topological insulator lasers (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… 2017-2-1 · Q-switching fibre laser using Topological Insulator (TI) Bismuth Selenide (Bi 2 Se 3).. Steady and wide Q-switching pulse operation with a repetition rate of 62.5 kHz attained.. Peak power of 1.15 mW was when input power is at 117.3 mW.
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Y Gong, S Wong, AJ Bennett, DL Huffaker, SS Oh. ACS Photonics 7 (8), 2089-2097, 2020.

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. [Image: S. Wittek (CREOL) and M.A. Bandres (Technion)] Here we propose an all-dielectric topological insulator laser scheme in the telecommunication region based on semiconductor cavities formed by topologically distinct Kagome photonic crystals. We demonstrate a nonmagnetic topological insulator laser exhibiting topologically-protected transport.
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The topological insulator laser alters current understanding of the interplay between disorder and lasing, and at the same time opens exciting possibilities in topological physics, such as topologically protected transport in systems with gain.

Conference Presentation This content is available for download via your institution's subscription. We show that for the topological insulator phase, the photoelectromagnetic effect amplitude is deﬁned by the number of incident radiation quanta, whereas for the trivial insulator phase, it depends on the power in a laser pulse irrespective of its wavelength. Topological insulator laser: rate-equation model. The topological insulator laser, considered in [7,8], is obtained byinsertingopticalgaininthe microringsatthe perimeter P of the square lattice and optical loss in the inner mi-crorings to facilitate oscillation in the edge supermodes.

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utilizes the topological edge states as the lasing mode. Topological insulator lasers combine the concepts of topological insulators with the fundamentals of lasers, which introduce gain, loss, and demonstrate lasing action inatopologicalplatform.Specifically,inthepresenceofan artificial gauge field [38], an optical lattice consisting of

On the technological side, the topological insulator laser provides a route to arrays of semiconductor lasers that operate as one single-mode high-power laser coupled efficiently into an output port. AB - Topological insulators are phases of matter characterized by topological edge States that propagate in a unidirectional manner that is robust to imperfections and disorder. Scientists and engineers have created the first electrically-driven 'topological' laser, which has the ability to route light particles around corners -- and to cope with defects in the Studies on three dimensional topological insulators (TIs) such as Bi 2 Te 3, Bi 2 Se 3, and Sb 2 Te 3 over the past decade have been intense due to their unique physical properties and potential applications for spintronics and quantum computing.

2021-04-12 · Topological insulators have notable manifestations of electronic properties. The helicity-dependent photocurrents in such devices are underpinned by spin momentum-locking of surface Dirac

The topological insulator laser, considered in [7,8], is obtained byinsertingopticalgaininthe microringsatthe perimeter P of the square lattice and optical loss in the inner mi-crorings to facilitate oscillation in the edge supermodes. Outcoupling is assumed at the edge microring at site “This new laser system went against all common knowledge about topological insulators,” said Prof. Segev. “In a nut shell, the unique robustness properties of topological insulators were believed to fail when the system contains gain, as all lasers must have. Topological insulators (TIs) have unique highly conducting symmetry-protected surface states while the bulk is insulating, making them attractive for various applications in condensed matter physics. Recently, topological insulator materials have been tentatively applied for both near- and far-field wavefront manipulation of electromagnetic waves, yielding superior plasmonic properties in the Figure 1: Topological insulators in a nut shell. (a) Topological insulator: a two-dimensional (2D) material that is insulating in the bulk but exhibits perfect conduction on the edge.

2018-3-16 2018-3-16 2020-8-19 · Here we propose an all-dielectric topological insulator laser scheme in the telecommunication region based on semiconductor cavities formed by topologically distinct Kagome photonic crystals. 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 2018-3-16 · Here we demonstrate a nonmagnetic topological insulator laser system exhibiting topologically protected transport in the cavity. Its topological properties give rise to single-mode lasing, robustness against defects, and considerably higher slope efficiencies compared to the topologically trivial counterparts.