Ballistic geometric resistance resonances in a single surface of a topological insulator

Abstract

Transport in topological matter has shown a variety of novel phenomena over the last decade. Although numerous transport studies have been conducted on three-dimensional topological insulators (3D-TIs), study of ballistic motion and thus exploration of potential landscapes on a hundred nanometer scale is for the prevalent TI materials almost impossible due to their low carrier mobility. Therefore it is unknown whether helical Dirac electrons in TIs, bound to interfaces between topologically distinct materials, can be manipulated on the nanometer scale by local gates or locally etched regions. Here we impose a submicron periodic potential onto a single surface of Dirac electrons in high mobility strained mercury telluride (HgTe), which is a strong TI. Pronounced geometric resistance resonances constitute the first observation of a ballistic effect in 3D-TIs.

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• Coherent spin transport through helical edge states of topological insulator
• High frequency impact ionization and nonlinearity of photocurrent induced by intense terahertz radiation in HgTe-based quantum well structures
• Estimating Lyapunov exponents in billiards
• Terahertz photoresistivity of a high-mobility 3D topological insulator based on a strained HgTe film
• Terahertz Magnetospectroscopy of Cyclotron Resonances from Topological Surface States in Thick Films of Cd${}_x$Hg${}_{1-x}$Te
• Transport study of the wormhole effect in three-dimensional topological insulators
• Skyrmion Pinball and Directed Motion on Obstacle Arrays
• Cyclotron resonance induced photogalvanic effect in surface states of 200 nm thick strained HgTe films
• Tunable helical crystals
• Anomalous Decay of Quantum Resistance Oscillations of Two Dimensional Helical Electrons in Magnetic Field
• Weak antilocalization in partially relaxed 200-nm HgTe films
• Effective Hamiltonian of topologically protected qubit in a helical crystal
• A non-magnetic mechanism of backscattering in helical edge states