In-situ strain tuning of the Dirac surface states in Bi2Se3 films

Abstract

Elastic strain has the potential for a controlled manipulation of the band gap and spin-polarized Dirac states of topological materials, which can lead to pseudo-magnetic-field effects, helical flat bands and topological phase transitions. However, practical realization of these exotic phenomena is challenging and yet to be achieved. Here, we show that the Dirac surface states of the topological insulator Bi2Se3 can be reversibly tuned by an externally applied elastic strain. Performing in-situ x-ray diffraction and in-situ angle-resolved photoemission spectroscopy measurements during tensile testing of epitaxial Bi2Se3 films bonded onto a flexible substrate, we demonstrate elastic strains of up to 2.1% and quantify the resulting reversible changes in the topological surface state. Our study establishes the functional relationship between the lattice and electronic structures of Bi2Se3 and, more generally, demonstrates a new route toward momentum-resolved mapping of strain-induced band structure changes.

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Cited by in corpus (18)

• Non-Abelian band topology in noninteracting metals
• Visualization of the strain-induced topological phase transition in a quasi-one-dimensional superconductor TaSe3
• Direct Observation of a Uniaxial Stress-driven Lifshitz Transition in Sr${}_2$RuO${}_4$
• Observation and control of the weak topological insulator state in ZrTe5
• Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors
• Accessing the spectral function of in operando devices by angle-resolved photoemission spectroscopy
• Ultrafast carrier-lattice interactions and interlayer modulations of Bi2Se3 by X-ray free electron laser diffraction
• Hierarchy of Lifshitz transitions in the surface electronic structure of Sr${}_2$RuO${}_4$ under uniaxial compression
• Heat-capacity measurements under uniaxial pressure using a piezo-driven device
• Uniaxial strain tuning of charge modulation and singularity in a kagome superconductor
• Ultrafast switching of topological invariants by light-driven strain
• Spatial localization and diffusion of Dirac particles and waves induced by random temporal medium variations
• The Future of the Correlated Electron Problem
• Inducing Quantum Phase Transitions in Non-Topological Insulators Via Atomic Control of Sub-Structural Elements
• Sb2Se3 and SbBiSe3 Surface Capping and Biaxial Strain Co-Engineering for Tuning the Surface Electronic Properties of Bi2Se3 Nanosheet- A Density Functional Theory based Investigation
• Inter-quintuple layer coupling and topological phase transitions in the chalcogenide topological insulators
• Exploring Structural and Electronic Properties of Topological Insulator/Graphene Nano-heterostructures
• Strain Engineering of Correlated Charge-Ordered Phases in 1T-TaS2