Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America.|Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America.|Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America.|Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America.|Department of Physics, University of Arkansas, Fayetteville, Arkansas, United States of America.