Projects per year
Abstract
Bulk and surface state contributions to the electrical resistance of single-crystal samples of the topological Kondo-insulator compound SmB6 are investigated as a function of crystal thickness and surface charge density, the latter tuned by ionic liquid gating with electrodes patterned in a Corbino disk geometry on a single (100) surface. By separately tuning bulk and surface conduction channels, we show conclusive evidence for a model with an insulating bulk and metallic surface states, with a crossover temperature that depends solely on the relative contributions of each conduction channel. The surface conductance, on the order of 100 e2/h, exhibits a field-effect mobility of 133 cm2/Vs and a large carrier density of ∼2×1014 cm−2, in good agreement with recent photoemission results. With the ability to gate modulate surface conduction by more than 25%, this approach provides promise for both fundamental and applied studies of gate-tuned devices structured on bulk crystal samples
Original language | English |
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Article number | 096601 |
Pages (from-to) | 1-5 |
Number of pages | 5 |
Journal | Physical Review Letters |
Volume | 114 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2015 |
Projects
- 1 Finished
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Understanding and Controlling the Properties of Dirac Electronic Materials
Fuhrer, M. (Primary Chief Investigator (PCI))
Australian Research Council (ARC)
14/01/13 → 30/09/18
Project: Research