Results 41 to 50 of about 5,529 (134)

Statistical topological insulators

Physical Review B, 2014
We define a class of insulators with gapless surface states protected from localization due to the statistical properties of a disordered ensemble, namely due to the ensemble's invariance under a certain symmetry. We show that these insulators are topological, and are protected by a $\mathbb{Z}_2$ invariant.
I. C. Fulga, B. van Heck, J. M. Edge, and A. R. Akhmerov   +3 more
openaire   +4 more sources

Topological insulator laser: Theory [PDF]

Science, 2018
Topological protection for lasersIdeas based on topology, initially developed in mathematics to describe the properties of geometric space under deformations, are now finding application in materials, electronics, and optics. The main driver is topological protection, a property that provides stability to a system even in the presence of defects ...
Harari, Gal, Bandres, Miguel A., Lumer, Yaakov, Rechtsman, Mikael C., Chong, Y. D., Khajavikhan, Mercedeh, Christodoulides, Demetrios N., Segev, Mordechai   +7 more
openaire   +4 more sources

Berry phase theory of planar Hall effect in topological insulators

Scientific Reports, 2018
The appearance of negative longitudinal magnetoresistance (LMR) in topological semimetals such as Weyl and Dirac semimetals is understood as an effect of chiral anomaly, whereas such an anomaly is not well-defined in topological insulators. Nevertheless,
S. Nandy, A. Taraphder, Sumanta Tewari
doaj   +1 more source

Skyrmion nucleation on the surface of a topological insulator

Physical Review Research, 2022
Skyrmion nucleation induced by spin-transfer torques at an interface of a topological insulator and a ferromagnetic insulator is investigated. Due to strong spin-orbit coupling on a surface of topological insulators, which enhances the effect of spin ...
Daichi Kurebayashi, Oleg A. Tretiakov
doaj   +1 more source

Topological Insulators, Topological Crystalline Insulators, Topological Semimetals and Topological Kondo Insulators

, 2014
In this Book Chapter (invited) we briefly review the basic concepts defining topological insulators and focus on elaborating on the key experimental results that revealed and established their symmetry protected (SPT) topological nature. We then present key experimental results that demonstrate magnetism, Kondo insulation, mirror chirality or ...
Hasan, M. Zahid, Xu, Su-Yang, Neupane, Madhab   +2 more
openaire   +2 more sources

Topological Crystalline Materials of J=3/2 Electrons: Antiperovskites, Dirac Points, and High Winding Topological Superconductivity

Physical Review X, 2018
We present a theory of the high-spin generalization of topological insulators and their doped superconducting states. The higher-spin topological insulators involve a pair of J=3/2 bands with opposite parity and are characterized by their band inversion.
Takuto Kawakami, Tetsuya Okamura, Shingo Kobayashi, Masatoshi Sato   +3 more
doaj   +1 more source

Topological magnon insulator in insulating ferromagnet [PDF]

Physical Review B, 2013
In the ferromagnetic insulator with Dzyaloshinskii-Moriya interaction, we theoretically predict and numerically verify a topological magnon insulator, where the charge-free magnon is topologically protected to transport along the edge while it is insulating in the bulk.
Zhang, L., Ren, J., Wang, J.-S., Li, B.
openaire   +2 more sources

Spectral Asymmetry Induces a Re‐Entrant Quantum Hall Effect in a Topological Insulator

Advanced Science
The band inversion of topological materials in three spatial dimensions is intimately connected to the parity anomaly of 2D massless Dirac fermions, known from quantum field theory.
Li‐Xian Wang, Wouter Beugeling, Fabian Schmitt, Lukas Lunczer, Julian‐Benedikt Mayer, Hartmut Buhmann, Ewelina M. Hankiewicz, Laurens W. Molenkamp   +7 more
doaj   +1 more source

Highly efficient broadband THz mixing and upconversion with Dirac materials

Communications Physics
The use of the THz frequency domain in future network generations offers an unparalleled level of capacity, which can enhance innovative applications in wireless communication, analytics, and imaging.
Tatiana A. Uaman Svetikova, Igor Ilyakov, Alexey Ponomaryov, Thales V. A. G. de Oliveira, Christian Berger, Lena Fürst, Florian Bayer, Jan-Christoph Deinert, Gulloo Lal Prajapati, Atiqa Arshad, Elena G. Novik, Alexej Pashkin, Manfred Helm, Stephan Winnerl, Hartmut Buhmann, Laurens W. Molenkamp, Tobias Kiessling, Sergey Kovalev, Georgy V. Astakhov   +18 more
doaj   +1 more source

Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states

Nature Communications, 2016
Future spintronic devices may exploit topological insulators, bulk insulators with unique spin-momentum locked conductive surface states. Here, the authors demonstrate the detection of thermally-generated spin currents in a ferromagnetic-insulator ...
Zilong Jiang, Cui-Zu Chang, Massoud Ramezani Masir, Chi Tang, Yadong Xu, Jagadeesh S. Moodera, Allan H. MacDonald, Jing Shi   +7 more
doaj   +1 more source