Balanced electron-hole transport in spin-orbit semimetal SrIrO 3 heterostructures
N. Manca (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
D.J. Groenendijk (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
Ilaria Pallecchi (University of Genova)
C. Autieri (Istituto superconduttori, materiali innovativi e dispositivi, Consiglio Nazionale delle Ricerche)
Lucas M.K. Tang (Radboud Universiteit Nijmegen)
Francesca Telesio (University of Genova)
Giordano Mattoni (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
Alix McCollam (Radboud Universiteit Nijmegen)
Silvia Picozzi (Istituto superconduttori, materiali innovativi e dispositivi, Consiglio Nazionale delle Ricerche)
A Caviglia (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
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Abstract
Relating the band structure of correlated semimetals to their transport properties is a complex and often open issue. The partial occupation of numerous electron and hole bands can result in properties that are seemingly in contrast with one another, complicating the extraction of the transport coefficients of different bands. The 5d oxide SrIrO3 hosts parabolic bands of heavy holes and light electrons in gapped Dirac cones due to the interplay between electron-electron interactions and spin-orbit coupling. We present a multifold approach relying on different experimental techniques and theoretical calculations to disentangle its complex electronic properties. By combining magnetotransport and thermoelectric measurements in a field-effect geometry with first-principles calculations, we quantitatively determine the transport coefficients of different conduction channels. Despite their different dispersion relationships, electrons and holes are found to have strikingly similar transport coefficients, yielding a holelike response under field-effect and thermoelectric measurements and a linear electronlike Hall effect up to 33 T.