Tuning bulk and surface conduction in the proposed topological Kondo insulator SmB(6)

Physical Review Letters
P SyersJohnpierre Paglione

Abstract

Bulk and surface state contributions to the electrical resistance of single-crystal samples of the topological Kondo-insulator compound SmB_{6} 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  e^{2}/h, exhibits a field-effect mobility of 133  cm^{2}/Vs and a large carrier density of ∼2×10^{14}  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.

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Citations

May 29, 2016·Proceedings of the National Academy of Sciences of the United States of America·Wan Kyu ParkLaura H Greene
Apr 30, 2016·Physical Review Letters·Nicholas P ButchJason R Jeffries
Nov 26, 2019·Physical Review Letters·S GheidiJ E Sonier
Aug 8, 2018·Physical Review Letters·N Harrison
Jun 12, 2019·Proceedings of the National Academy of Sciences of the United States of America·Yun Suk EoZachary Fisk
Jun 24, 2020·Proceedings of the National Academy of Sciences of the United States of America·Ke-Jun XuZhi-Xun Shen
May 8, 2016·Physical Review Letters·Alex SternJing Xia
Jul 9, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Nan XuMing Shi
Jul 5, 2016·Reports on Progress in Physics·Liling Sun, Qi Wu
Apr 22, 2021·Proceedings of the National Academy of Sciences of the United States of America·Biao YangJohannes V Barth

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