“…As it is clearly seen from Figure 2, 2H-and 1T-AsTe 2 monolayers are dynamically stable because all phonon modes have real eigenfrequencies; thus, it is shown that synthesis of both phases is possible as a free-standing monolayer via bottom-up approaches: chemical vapor deposition and atomic or molecular condensation methods, allowing the As and Te as precursors to grow in size. [43][44][45][46] Furthermore, due to atomic masses, the phonon modes of 2H-AsTe 2 and 1T-AsTe 2 monolayers lie at low frequencies smaller than 200 cm À1 , which indicate that both of them are softer materials than other 2D materials such as MoS 2 , graphene, h-BN. [56][57][58] It is well-known that the soft materials have the low thermal conductivity, namely, the predicted ultra-thin AsTe 2 structures can be utilized as the thermoelectric materials.…”