We report on the angle-resolved polarized Raman spectroscopy and estimation of the Raman tensor elements using both classical and quantum treatments to analyze the polarized Raman spectra of single crystal Bi2Te3. The observed polar patterns and systematic variations in the relative intensities of four characteristic Raman-active modes indicate a higher differential polarizability along the c axis, accompanied by anisotropic photon-phonon interactions. This interplay of electron-photon-phonon interactions is crucial for understanding the lattice dynamics of Bi2Te3, which underpin its thermoelectric performance and topological properties.
Funding Agencies|DST India [DST/INT/SWD/VR/P-18/2019]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty SFO-Mat-LiU Grant) [2009 00971]; Knut and Alice Wallenberg foundation through the Wallenberg Academy Fellows program [KAW-2020.0196]; Swedish Research Council (VR) [2021-03826]; Foundation for Strategic Research (SSF) [2021-00171]; [RIF21-0026]