RT Journal Article
SR Electronic
T1 Signatures of Electron Fractionalization in Ultraquantum Bismuth
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1729
OP 1731
DO 10.1126/science.1146509
VO 317
IS 5845
A1 Behnia, Kamran
A1 Balicas, Luis
A1 Kopelevich, Yakov
YR 2007
UL http://science.sciencemag.org/content/317/5845/1729.abstract
AB Because of the long Fermi wavelength of itinerant electrons, the quantum limit of elemental bismuth (unlike most metals) can be attained with a moderate magnetic field. The quantized orbits of electrons shrink with increasing magnetic field. Beyond the quantum limit, the circumference of these orbits becomes shorter than the Fermi wavelength. We studied transport coefficients of a single crystal of bismuth up to 33 tesla, which is deep in this ultraquantum limit. The Nernst coefficient presents three unexpected maxima that are concomitant with quasi-plateaus in the Hall coefficient. The results suggest that this bulk element may host an exotic quantum fluid reminiscent of the one associated with the fractional quantum Hall effect and raise the issue of electron fractionalization in a three-dimensional metal.