TY - JOUR
T1 - Hybridization gap formation in the Kondo insulator YbB12 observed using time-resolved photoemission spectroscopy
AU - Okawa, M.
AU - Ishida, Y.
AU - Takahashi, M.
AU - Shimada, T.
AU - Iga, F.
AU - Takabatake, T.
AU - Saitoh, T.
AU - Shin, S.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/10/12
Y1 - 2015/10/12
N2 - A detailed low-energy electronic structure of a Kondo insulator YbB12 was revealed by a synergetic combination of ultra-high-resolution laser photoemission spectroscopy (PES) and time-resolved PES. The former confirmed a 25-meV pseudogap corresponding to the Kondo temperature of this material, and more importantly, it revealed that a 15-meV gap and a Kondo-peak feature developed below a crossover temperature of T∗∼110K. In harmony with this, the latter discovered a very long recombination time exceeding 100 ps below ∼T∗. This is a clear manifestation of photoexcited carriers due to the bottleneck in the recovery dynamics, which is interpreted as a developing hybridization gap of a hard gap.
AB - A detailed low-energy electronic structure of a Kondo insulator YbB12 was revealed by a synergetic combination of ultra-high-resolution laser photoemission spectroscopy (PES) and time-resolved PES. The former confirmed a 25-meV pseudogap corresponding to the Kondo temperature of this material, and more importantly, it revealed that a 15-meV gap and a Kondo-peak feature developed below a crossover temperature of T∗∼110K. In harmony with this, the latter discovered a very long recombination time exceeding 100 ps below ∼T∗. This is a clear manifestation of photoexcited carriers due to the bottleneck in the recovery dynamics, which is interpreted as a developing hybridization gap of a hard gap.
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U2 - 10.1103/PhysRevB.92.161108
DO - 10.1103/PhysRevB.92.161108
M3 - Article
AN - SCOPUS:84944720376
SN - 0163-1829
VL - 92
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 16
M1 - 161108
ER -