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Related Experiment Video

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Kondo breakdown in topological Kondo insulators.

Victor Alexandrov¹, Piers Coleman^1,2, Onur Erten¹

¹Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA.

Physical Review Letters

|May 16, 2015

Summary

Surface Kondo breakdown in topological Kondo insulators creates light, durable surface states. These states, doped by uncompensated electrons, exhibit unique dispersion and resist magnetic effects and thinness.

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Area of Science:

Condensed matter physics
Materials science

Background:

Topological Kondo insulators (TKIs) exhibit unique electronic properties.
Samarium hexaboride (SmB6) shows light surface states, hinting at novel phenomena.

Purpose of the Study:

Investigate the impact of surface Kondo breakdown in TKIs.
Understand the nature and properties of resulting surface states.

Main Methods:

Numerical simulations
Analytical calculations

Main Results:

Surface Kondo breakdown decouples localized moments, disrupting electron compensation.
This disruption dopes the Dirac cone, creating uncompensated surface states.
Intersite hopping dominates dispersion, leading to lighter quasiparticles.
Surface states demonstrate robustness against surface magnetism and reduced sample thickness.

Conclusions:

Surface Kondo breakdown is a key mechanism for generating exotic surface states in TKIs.
The resulting light and durable surface states have potential applications in future electronic devices.