Snowflake Topological Insulator for Sound Waves

90°-turns with polarization-independent single-mode waveguide on silicon-on- insulator for telecommunication wavelengths

Experimental demonstration of anomalous Floquet topological insulator for sound

Time-reversal invariant topological insulator is widely recognized as one of the fundamental discoveries in condensed matter physics, for which the most fascinating hallmark is perhaps a spin-based topological protection, the absence of scattering of conduction electrons with certain spins on matter surface. Recently, it has created a paradigm shift for topological insulators, from electronics ...

Quantum interference by localized scattering waves of gapless helical modes in narrow strips of topological insulators

Bosonic topological insulator in three dimensions and the statistical Witten effect

It is well-known that one signature of the three-dimensional electron topological insulator is the Witten effect: if the system is coupled to a compact electromagnetic gauge field, a monopole in the bulk acquires a half-odd-integer polarization charge. In the present work, we propose a corresponding phenomenon for the topological insulator of bosons in 3d protected by particle number conservati...

Novel Applications of Topological Indices. 1. Prediction of the Ultrasonic Sound Velocity in Alkanes and Alcohols

Several different topological indices (the carbon number, the Wiener index, the Balaban dis­ tance sum connectivity index, the Randic molecular identification number, and the Randic molecular connectivity indices °/, 2%, 3̂ p and 3/ c) were employed in the correlation of the velocity of ultrasonic sound in a variety of alkane and alcohol species. Using linear regression analyses and published so...