Features of Lifshits Electron Topological Transitions Induced by Anisotropic Deformation in Thin Wires of Doped Bismuth

Abstract

For the first time, glass-coated single-crystal Bi–0.05Sn wires with d=200 nm ÷ 3 μm with C3 oriented along the wire axis were obtained by the recrystallization method of the wires with standard (10 \(\bar{1}\) 1) orientation, which made it possible to study the thermopower anisotropy. With the use of ShdH oscillations method, we have determined characteristics of changes in the Fermi surface topology at Lifshits electron topological transitions induced by tension in single-crystal Bi–0.05Sn wires with a standard (10 \(\bar{1}\) 1) orientation and with the C3 orientation along the wire axis. It is found that the thermopower increase with deformation and thermopower anisotropy of the Bi–0.05Sn wires with trigonal orientation achieves a value of 130–150 μV/K which leads to a considerable increase of thermoelectric efficiency, which is important for practical applications, in particular, for their use as anisotropic thermoelectric energy converters.