A new subclass of harmonic functions defined by fractional operator

In the present study, we introduce an investigation of a new subclass of harmonic functions which are defined by fractional operator. Firstly, using by fractional operator, we define a new subclass of harmonic functions. Later, we obtain main theorems of our study which contain sufficient and necessary coefficient bounds for functions related to the classes newly defined. Also, several particular characterization properties of these subclasses are given. Some of these properties involve extreme points, convex combination, distortion bounds. Finally, for some special cases of parameters several corollaries of the main theorems are presented.