Signature of surface state coupling in thin films of the topological Kondo insulator SmB$_6$ from anisotropic magnetoresistance

@article{Petrushevsky2016SignatureOS,
  title={Signature of surface state coupling in thin films of the topological Kondo insulator SmB\$\_6\$ from anisotropic magnetoresistance},
  author={M. Petrushevsky and P. K. Rout and Georges L{\'e}vi and Amit Kohn and Y. Dagan},
  journal={arXiv: Strongly Correlated Electrons},
  year={2016},
  pages={7}
}
The temperature and thickness dependencies of the in-plane anisotropic magnetoresistance (AMR) of SmB$_6$ thin films are reported. We find that the AMR changes sign from negative ($\rho_{||} \rho_{\perp}$) at low temperatures. The temperature, T$_s$, at which this sign change occurs, decreases with increasing film thickness $t$ and T$_s$ vanishes for $t$ $>$ 30 nm. We interpret our results in the framework of a competition between two components: a negative bulk contribution and a positive… 

Surface-induced positive planar Hall effect in topological Kondo insulator SmB6 microribbons

Whether the surface states in ${\mathrm{SmB}}_{6}$ are topological is still a critical issue in the field of topological Kondo insulators. In the magneto-transport study of single crystalline

Nontrivial Nature and Penetration Depth of Topological Surface States in SmB_{6} Thin Films.

The nontrivial feature and penetration depth of the topological surface states (TSS) in SmB_{6} were studied via spin pumping and show a unique film thickness dependence that suggests a TSS depth of ∼32  nm.

Bulk and Surface Properties of SmB6

Samarium hexaboride crystallizes in a simple cubic structure (space group #221, Pm-3m), but its properties are far from being straightforward. Initially classified as a Kondo insulator born out of

Planar Hall effect with sixfold oscillations in a Dirac antiperovskite

The authors report a planar Hall effect in Sr${}_{3}$SnO wherein the transverse voltage oscillates six times as a magnetic field is rotated once in the plane of the sample.

Emergent mystery in the Kondo insulator samarium hexaboride

Samarium hexaboride (SmB 6 ) is an example of a Kondo insulator, in which strong electron correlations cause a band gap to open. SmB 6 hosts both a bulk insulating state and a conductive surface

References

SHOWING 1-10 OF 36 REFERENCES

Weak antilocalization and linear magnetoresistance in the surface state of SmB 6

The strongly correlated Kondo insulator ${\mathrm{SmB}}_{6}$ is known for its peculiar low-temperature residual conduction, which has recently been demonstrated to arise from a robust metallic

Robust topological surface state in Kondo insulator SmB6 thin films

Fabrication of smooth thin films of topological insulators with true insulating bulk are extremely important for utilizing their novel properties in quantum and spintronic devices. Here, we report

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

By separately tuning bulk and surface conduction channels, it is shown 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.

Emergence of a coherent in-gap state in the SmB6 Kondo insulator revealed by scanning tunneling spectroscopy.

It is proposed that the in-gap resonance state is due to a collective excitation in magnetic origin with the presence of spin-orbital coupling and mixed valence fluctuations in SmB6.

Surface Hall Effect and Nonlocal Transport in SmB6: Evidence for Surface Conduction

These results serve as proof that at low temperatures SmB6 has a metallic surface that surrounds an insulating bulk, paving the way for transport studies of the surface state in this proposed TKI material.

Low-temperature surface conduction in the Kondo insulator SmB6

We study the transport properties of the Kondo insulator SmB6 with a specialized configuration designed to distinguish bulk-dominated conduction from surface-dominated conduction. We find that as the

Two-dimensional Fermi surfaces in Kondo insulator SmB6

The electronic structure of SmB6 in high magnetic fields is traced and it is found that it does indeed have two-dimensional surface states, and this material is confirmed to be a topological insulator.

Topological surface state in the Kondo insulator samarium hexaboride.

Thickness-dependent transport measurements on doped SmB6 are reported, and it is shown that magnetic and non-magnetic doping results in contrasting behaviour that supports the conclusion that SmB 6 shows virtually no residual bulk conductivity.

Electrically tunable in-plane anisotropic magnetoresistance in topological insulator BiSbTeSe2 nanodevices.

The large, tunable and bipolar in-plane AMR in BSTS devices provides the possibility of fabricating more sensitive logic and magnetic random access memory AMR devices.

Kondo breakdown in topological Kondo insulators.

Results are presented which show that the decoupling of the localized moments at the surface disturbs the compensation between light and heavy electrons and dopes the Dirac cone.