About the Authors

T. X. R. Souza

t.x.r.souza@gmail.com

Affiliation Departamento de Fisica, Universidade Federal de Sergipe, 49100-000 Sao Cristovao, SE, Brazil

C. A. Macedo

Affiliation Departamento de Fisica, Universidade Federal de Sergipe, 49100-000 Sao Cristovao, SE, Brazil

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TXRS CAM. Performed the experiments: TXRS CAM. Analyzed the data: TXRS CAM. Contributed reagents/materials/analysis tools: TXRS CAM. Wrote the paper: TXRS CAM.