title: Temperature dependent phonon shifts in single-layer WS(2).
abstract: Atomically thin two-dimensional tungsten disulfide (WS2) sheets have attracted much attention due to their potential for future nanoelectronic device applications. We report first experimental investigation on temperature dependent Raman spectra of single-layer WS2 prepared using micromechanical exfoliation. Our temperature dependent Raman spectroscopy results shows that the E(1)2g and A1g modes of single-layer WS2 soften as temperature increases from 77 to 623 K. The calculated temperature coefficients of the frequencies of 2LA(M), E(1)2g, A1g, and A1g(M) + LA(M) modes of single-layer WS2 were observed to be -0.008, -0.006, -0.006, and -0.01 cm(-1) K(-1), respectively. The results were explained in terms of a double resonance process which is active in atomically thin nanosheet. This process can also be largely applicable in other emerging single-layer materials.
authors.affiliation: Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory , Dr. Homi Babha Road, Pashan, Pune 411008, India.
authors.forename: Thripuranthaka
authors.initials: T
authors.lastname: M
authors.forename: Dattatray J
authors.initials: DJ
authors.lastname: Late