# Forskningsrapporter - ÅForsk

Forskning vid Uppsala universitet - Uppsala universitet

However, TI materials are fragile and often incompatible with nanofabrication techniques. Here, we demonstrate persistent, micron-scale optical control of both magnetization and chemical potential in Cr-(Bi,Sb)2Te3 grown on SrTiO3. We show that this system is uniquely Researchers at SLAC National Accelerator Laboratory and Stanford University discovered that focusing intense, circularly polarized laser light on a topological insulator generates harmonics that Angle-resolved photoemission evidence for a three-dimensional higher-order topological insulator is presented. of topological hinge states by laser ARPES. experiments.

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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 2021-04-12 2011-11-28 ### CONCLUSION We have experimentally demonstrated an all-dielectric topological insulator laser and found that the topological features enhance the lasing performance of a two-dimensional array of 2018-03-16 · 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. TOPOLOGICAL PHOTONICS Topological insulator laser: Experiments Miguel A. Bandres,* Steffen Wittek,* Gal Harari,* Midya Parto, Jinhan Ren, Mordechai Segev,† Demetrios N. Christodoulides,† Mercedeh 2018-01-31 · new avenues to control the topological features.

502, 2018. Topological Topological insulator laser: Experiments, M. A. Bandres, S. Wittek, G. Harari, M. Parto, J. Ren, M. Segev, D. N. Christodoulides, and M. Khajavikhan, 5 Feb 2018 And recent experiments have indeed demonstrated topologically protected behavior in some photonic setups. But those demos have generally Abstract: We demonstrate a nonmagnetic topological insulator laser exhibiting topologically- protected transport.

## The Swedish Guide • 2020 by bigsciencesweden - issuu

Topological Topological insulator laser: Experiments, M. A. Bandres, S. Wittek, G. Harari, M. Parto, J. Ren, M. Segev, D. N. Christodoulides, and M. Khajavikhan, 5 Feb 2018 And recent experiments have indeed demonstrated topologically protected behavior in some photonic setups. But those demos have generally Abstract: We demonstrate a nonmagnetic topological insulator laser exhibiting topologically- protected transport.

### Jobb inom forskning och högre utbildningssektorn

During a) a) b) c) Figure 1: Topological insulators in a 2015-03-16 Researchers at the Technion and in the U.S. 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 today by the prestigious journal Science. 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 … Review: 3D Topological Insulator • First generation of 3D topological insulators include: Bi 1-x Sb x, Bi 2 Se 3, Bi 2 Te 3, Sb 2 Te 3, Sb, etc… • The edge of a 3D material is a 2D surface. • Due to the spin texture, back scattering is still forbidden.

Design of the
Here, we demonstrate a nonmagnetic topological insulator laser system exhibiting topologically protected transport in the cavity. The topological insulator laser constructed from an aperiodic array of resonators was realized experimentally in an all-dielectric platform, as described in the accompanying experimental paper by
Here, we demonstrate a nonmagnetic topological insulator laser system exhibiting topologically protected transport in the cavity.

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Indeed, depending on how it is configured, it can behave as a weak or strong topological insulator, a 3D quantum Hall state or a Dirac semimetal. Indium gallium arsenide phosphide spontaneously emits light when excited by a laser, with this light populating the edge state that exists between the topologically distinct materials. This edge state can then be used to make a scattering-proof laser cavity of any shape.

Bandres, M. A. et al.

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### Jobb inom forskning och högre utbildningssektorn

Postdoc position (f/m/d) in topological-insulator circuit Quantum Electrodynamics mixtures, in a project funded by the innovative Villum Foundation 'Experiment' . Position in Miniaturized Optical / Acoustical System for Smart Laser Surgery. and investigations of optical excitations in the topological insulator Bi2Se3.

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

1,2 1. Higher-order topological insulator (HOTI) represents a new phase of matter, the characterization of which goes beyond the conventional bulk-boundary correspondence and is attracting significant 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. Floquet topological insulators are a special case in the family of photonic realizations of topological systems, where a system is also periodic in an evolution variable, which can be either time or a longitudinal coordinate.

## Olle Eriksson - School of Science and Technology - Örebro

Laser-Based Angle-Resolved Photoemission Spectroscopy of Topological Insulators. Doctoral dissertation, Harvard 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.

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