title: Dimerization-induced Fermi-surface reconstruction in IrTe2.
abstract: We report a de Haas-van Alphen (dHvA) oscillation study on IrTe2 single crystals showing complex dimer formations. By comparing the angle dependence of dHvA oscillations with band structure calculations, we show distinct Fermi surface reconstruction induced by a 1/5-type and a 1/8-type dimerizations. This verifies that an intriguing quasi-two-dimensional conducting plane across the layers is induced by dimerization in both cases. A phase transition to the 1/8 phase with higher dimer density reveals that local instabilities associated with intra- and interdimer couplings are the main driving force for complex dimer formations in IrTe2.
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Man Jin
authors.initials: MJ
authors.lastname: Eom
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Kyoo
authors.initials: K
authors.lastname: Kim
authors.affiliation: Department of Physics, Kyungpook National University, Daegu 702-701, Korea.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Jo
authors.affiliation: Laboratory for Pohang Emergent Materials, Pohang University of Science and Technology, Pohang 790-784, Korea and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: J J
authors.initials: JJ
authors.lastname: Yang
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
authors.forename: E S
authors.initials: ES
authors.lastname: Choi
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: B I
authors.initials: BI
authors.lastname: Min
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: J-H
authors.initials: JH
authors.lastname: Park
authors.affiliation: Laboratory for Pohang Emergent Materials, Pohang University of Science and Technology, Pohang 790-784, Korea and Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Piscataway, New Jersey 08854, USA.
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Jun Sung
authors.initials: JS
authors.lastname: Kim