Fig. 1. (a) The schematic diagram of this system, and the rods are colored according to their angle with respect to the radial direction; (b) the interaction between rods.

Fig. 2. The snapshots of three regions with fixed particle number for different noise levels, and, respectively, with (a) , self-propelled particle absorbed ordered region, (b) transient region, and (c) disordered phase. The color represents the radial direction as Fig.1.

Fig. 3. Phase diagrams for self-propelled rods in elastic-ring with varying the noise strength and the number of self-propelled rods , and the order parameter corresponding to (a) the radial polarity and (b) the asphericity . We have maximal asphericity in the transition region.

Fig. 4. (a) Phase diagram of the reduced density difference P for self-propelled rods with varying the noise strength and the number of self-propelled rods ; (b) density of central particles, , versus the particle number for different noise strength .

Fig. 5. Mean-squared displacement(MSD)for the center of mass of particle and elastic ring: (a) Noise levels , , and for ; (b) noise levels for , , and with particle number in the disordered regime.