Topological insulators are electrically insulating in their bulk, but they can conduct electricity extremely well on their surfaces (or edges) via special electronic states that are protected from fluctuations in their environment. Within these states, electrons can only travel in one direction (or channel) and do not backscatter.

2021-4-12 · The topological insulator crystal was intrinsically achiral, Sun et al. next adjusted the laser beam position on the BSTS flake and BSTS metamaterial to obtain the maximum photocurrent. The

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. 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 Here, we demonstrate a nonmagnetic topological insulator laser system exhibiting topologically protected transport in the cavity. The topological properties give rise to single mode lasing, The result suggests that topological insulators are potentially attractive as broadband pulsed modulators for the generation of short and ultrashort pulses in bulk solid‐state lasers, in addition to other promising applications in physics and computing. 2020-02-12 · Previous demonstrations of topological lasers have required an external laser source for optical pumping and have operated in the conventional optical frequency regime 5, 6, 7, 8.

[iCalendar]. effective spin interactions in antiferromagnets by short laser pulses and paves of antiferromagnet from one side and Weyl semimetal or topological insulator superconductivity, heavy electron systems and topological insulators. group is also active users of synchrotron light sources and free electron lasers. Swedish University dissertations (essays) about TOPOLOGICAL. laser based light source; topological insulator; topological crystalline insulator; thin films; A new generation of superluminous X-ray free-electron lasers (XFEL) like Fe based superconductors and topological insulators along with Dilute Nitride Nanowire Lasers Based on a GaAs/GaNAs Core/Shell spin texture in a 3D topological insulator2020Ingår i: Scientific Reports, ISSN 2045-2322, Work on nanowire lasers, ferroelectric memory devices, and "the Quantum Hall effect and topological insulators" are among the research Structural phase transition in monolayer gold(I) telluride: From a room-temperature topological insulator to an auxetic semiconductor2021Ingår i: Physical Highly tunable magnetic coupling in ultrathin topological insulator films due to impurity resonances2020In: Physical Review B, ISSN 2469-9950, E-ISSN Nyckelord :Topological insulator; Band structure; Block tridiagonal matrix; at low temperatures by laser beams, simulate systems which can be adequately A new generation of superluminous X-ray free-electron lasers (XFEL) like Fe based superconductors and topological insulators along with Both the X-ray beam (blue) and the laser beam (red) travel a similar pathway (in-vacuum) based topological insulators, Physical Review B 86. (2012), 045439. case studies, such as optical modes in gold tapers probed by electron beams and investigations of optical excitations in the topological insulator Bi2Se3.

We demonstrate a nonmagnetic topological insulator laser exhibiting topologically-protected transport. The topological properties of the system give rise to single mode lasing, robustness against fabrication defects, and higher slope efficiencies compared to its trivial counterpart.

Here we 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 resonators exhibits topological edge states. Incorporating We introduce a class of topological lasers based on the photonic Floquet topological insulator concept. 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 new generation of superluminous X-ray free-electron lasers (XFEL) will deliver like Fe based superconductors and topological insulators along with the new

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 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 2019-10-29 · Title: Floquet topological insulator laser. Authors: Sergey K. Ivanov, Yiqi Zhang, Yaroslav V. Kartashov, Dmitry V. Skryabin (Submitted on 29 Oct 2019) Abstract: 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 the lasing helical Topological insulators are a phase of matter with an insulating bulk and conducting edges. A topological insulator is characterized by a bulk bandgap where topological gapless unidirectional edge states reside. These edge states are robust to any perturbation that does not close the bandgap.

[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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The proposed system is realized as a truncated array of lasing helical waveguides, where the 2019-10-29 · Title: Floquet topological insulator laser. Authors: Sergey K. Ivanov, Yiqi Zhang, Yaroslav V. Kartashov, Dmitry V. Skryabin (Submitted on 29 Oct 2019) Abstract: 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 the lasing helical Topological insulators are a phase of matter with an insulating bulk and conducting edges. A topological insulator is characterized by a bulk bandgap where topological gapless unidirectional edge states reside. These edge states are robust to any perturbation that does not close the bandgap.

topological lasers have required an external laser source for optical pumping, and operated Topological insulator laser: Experiments. Science 359, eaar4005 . Spin injection and helicity control of surface spin photocurrent in a three dimensional topological insulator En tredimensionell (3D) topologisk isolator (TI) är en non-Hermitian Chern insulator.
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2020-10-07 · (a) Topological insulator: a two-dimensional (2D) material that is insulating in the bulk but exhibits perfect conduction on the edge. (b) Simplified sketch of the integer quantum Hall effect, which was the first topological insulator.

A topological insulator is characterized by a bulk bandgap where topological gapless unidirectional edge states reside. These edge states are robust to any perturbation that does not close the bandgap.

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To the best of our knowledge, this is the highest output power for the pulsed fluoride fiber laser around 2.8 μm modulated by the two-dimensional Dirac material. This letter reveals that the topological insulator can be a kind of promising nonlinear modulator for a mid-infrared laser.

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all-optical data-processing schemes, and generation of powerful laser beams, metamaterials, photonic topological insulators, PT-symmetric waveguides,

The topological properties give rise to single mode lasing, The result suggests that topological insulators are potentially attractive as broadband pulsed modulators for the generation of short and ultrashort pulses in bulk solid‐state lasers, in addition to other promising applications in physics and computing. 2020-02-12 · Previous demonstrations of topological lasers have required an external laser source for optical pumping and have operated in the conventional optical frequency regime 5, 6, 7, 8. Here we 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 resonators exhibits topological edge states. Incorporating We introduce a class of topological lasers based on the photonic Floquet topological insulator concept. 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.

Here, we proposed the topological insulator laser: a photonic topological insulator that lases. The design of such a laser system is highly non-standard - a laser is an open, non-Hermitian (due to gain/loss) and nonlinear (due to saturation) system. 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 We demonstrate a nonmagnetic topological insulator laser exhibiting topologically-protected transport. The topological properties of the system give rise to single mode lasing, robustness against fabrication defects, and higher slope efficiencies compared to its trivial counterpart. Schematic of one module of the topological insulator laser in synthetic dimensions. (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.