Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.246603
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Funding
- Basic Science Research Program and National Nuclear R&D Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science, and Technology [2010-0021438, 2012R1A1B3000550, 2012M2B2A4029488]
- National Research Foundation of Korea [2010-0021438, 2012M2B2A4029488] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Dirac metals (gapless semiconductors) are believed to turn into Weyl metals when perturbations, which break either time reversal symmetry or inversion symmetry, are employed. However, no experimental evidence has been reported for the existence of Weyl fermions in three dimensions. Applying magnetic fields near the topological phase transition from a topological insulator to a band insulator in Bi-1 - Sb-x(x) we observe not only the weak antilocalization phenomenon in magnetoconductivity near zero magnetic fields (B< 0.4 T), but also its upturn above 0.4 T only for E/ / B B. This incompatible'' coexistence between weak antilocalization and negative'' magnetoresistivity is attributed to the Adler-Bell-Jackiw anomaly (topological'' E . B term) in the presence of weak antilocalization corrections.
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