Author(s):
1. Ivanka Milošević, Faculty of Physics, University of Belgrade, Serbia
2. Zoran Popović, University of Belgrade, Faculty of Physics, Serbia
3. Milan Damnjanović, Physics Faculty, Serbia

Abstract:
Mechanically induced topological phase transitions in single-wall carbon nanotubes (SWCNTs) are theoretically and numerically studied. The discontinuous change of the Z-topological invariant (when the band gap closes and the number of edge states changes) at certain critical amplitudes of induced homogeneous mechanical deformations is obtained. In this way, singular points (in the parameter configuration space) for each of the SWCNTs are found. These data are then used to design adiabatic quantum charge pumping cycles (through the SWCNTs) by simultaneously exciting two selected phonon modes and finely tuning their frequency ratio by applying elastic deformations. The Wilson operator eigenspectra are calculated, and the Wannier charge centers' flow through the (insulating) bulk is evidenced.

Key words:
Thouless Charge Pump,Berry Phase,Modern Theory of Polarization,Carbon Naotubes,Topological Quantized Charge Transport

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
12.06.2024.

Conference:
Contemporary Materials 2024 - Savremeni Materijali