Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C08: Topological Insulator Experiment
2:30 PM–5:30 PM,
Monday, March 5, 2018
LACC Room: 153C
Sponsoring Unit: DCMP
Chair: Yang-hao Chan, Institute of Physics Academia, Sinica
Abstract: C08.00015 : Engineering Topological Superlattices: Prospects and Limitations
5:18 PM–5:30 PM
We developed a new artificial topological insulator (TI) system in heterostructure films consisting of alternating Bi2Se3 (topological) and In2Se3 (trivial) layers grown via molecular beam epitaxy (MBE). Building upon our past work on similar superlattices, here we systematically explore both the prospects and limitations of this model. Due to weak interlayer bonding energies in these van der Waals systems, we find that this topological superlattice structure tends to develop non-ideal, wavy interfaces as the number of superlattices grows. However, despite such structural imperfections, we discover that some of the electronic transport properties such as the weak antilocalization (WAL) effect robustly represent the well-defined quantized values of superlattice unit cells. The particularly remarkable robustness of the WAL effect allows us to map out a phase diagram for this artificial topological material as a function of intra- and inter- coupling strengths between the topological and trivial unit layers.
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