Unexpected orbital magnetism in Bi-rich Bi2Se3 nanoplatelets

Hae Jin Kim, Marios S. Katsiotis, Saeed Alhassan, Irene Zafiropoulou, Michael Pissas, Yannis Sanakis, Georgios Mitrikas, Nikolaos Panopoulos, Nikolaos Boukos, Vasileios Tzitzios, Michael Fardis, Jin Gyu Kim, Sang Gil Lee, Young Min Kim, Seung Jo Yoo, Ji Hyun Lee, Antonios Kouloumpis, Dimitrios Gournis, Michael Karakassides, Georgios Papavassiliou

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The discovery of two-dimensional electron gas states with giant Rashba spin splitting (RSS) in electron-doped three-dimensional topological insulators (TIs) uncovered new fascinating physics and raised hopes for novel spintronic devices. Significant challenges, including synthetic constraints and control of the magnetic properties, must be addressed before any breakthroughs are possible. Here, we show how RSS in Bi-rich Bi2Se3 nanoplatelets is responsible for the appearance of remarkable orbital magnetic properties, as observed using magnetization and conduction electron spin resonance experiments and confirmed by theoretical simulations. In view of the strong spin-orbit coupling (SOC) and the proximity to the TI surface states, this discovery enlightens fundamental aspects of SOC-based functionalities of TI materials with aims for future applications.

Original languageBritish English
Article numbere271
JournalNPG Asia Materials
Volume8
Issue number5
DOIs
StatePublished - 27 May 2016

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