Irreversible Multi-Band Effects and Lifshitz Transitions at the LaAlO3/SrTiO3 Interface Under Field Effect


Pallecchi I., Lorenzini N., Safeen M. A., CAN M. M., Di Gennaro E., Granozio F. M., ...Daha Fazla

ADVANCED ELECTRONIC MATERIALS, cilt.7, sa.3, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 7 Sayı: 3
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1002/aelm.202001120
  • Dergi Adı: ADVANCED ELECTRONIC MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, Computer & Applied Sciences, INSPEC
  • Anahtar Kelimeler: field effect, multiband transport, oxide interfaces, ELECTRONS, PHYSICS
  • İstanbul Üniversitesi Adresli: Evet

Özet

In this work, the irreversible effects of an applied electric field on the magnetotransport properties of LaAlO3/SrTiO3 conducting interfaces are investigated, with focus on their multiband character. Samples of different types, namely with either crystalline or amorphous LaAlO3 overlayer, are studied. The two-band analysis highlights the similarity of the electronic properties of crystalline and amorphous interfaces, regardless much different carrier densities and mobilities. Furthermore, filling and depletion of the two bands follow very similar patterns, at least in qualitative terms, in the two types of samples. In agreement with previous works on crystalline interfaces, it is observed that an irreversible charge depletion takes place after application of a first positive back gate voltage step. Such charge depletion affects much more, in relative terms, the higher and three-dimensional d(yz), d(zx) bands than the lower and bidimensional d(xy), driving the system through the Lifshitz transition from two-band to single band behavior. The quantitative analysis of experimental data evidences the roles of disorder, apparent in the depletion regime, and temperature. Noteworthy, filling and depletion of the two bands follow very similar patterns in crystalline and amorphous samples, at least in qualitative terms, regardless much different carrier densities and mobilities.