Abstract
1T-TaS2 is a 2D quantum material supporting charge density waves (CDWs) at room temperature. The strong correlations in this material make its electrical properties extremely sensitive to external stimuli such as an electrical bias and illumination. Recently, we demonstrated that the optical properties of this material also considerably change with electrical bias and light. With light, we showed that the CDW domains across layers stack differently and thus result in a unity-order change in the refractive index. Here, we demonstrate that an in-plane electrical bias also changes the CDW stacking in 1T-TaS2. However, the stacking change with electrical bias opposes that with illumination. Our experiments at room temperature suggest that an in-plane electrical bias sets the CDWs sliding and making way for the higher energy stacking configurations to switch to the ground-state stacking. The demonstration here sheds light on the origin of the giant electro-optical effect previously observed in 1T-TaS2 and paves the way for low-power MHz-fast electrically tunable optical devices.
Highlights
Correlated materials support many intriguing phenomena arising from quantum many-body effects.1–3 The balance between various quantum many-body interactions in these materials responds to external stimuli, resulting in novel phenomena.4–6 Understanding the competition between the microscopic processes in these materials is essential for controlling the strong correlations
In this work, we probe the origin of one such novel phenomenon discovered in 1T-TaS2, a quasi-2D material supporting charge density waves (CDWs) at room temperature
We investigated the reorganization of CDW stacking in 1T-TaS2 at room temperature with DC and AC biases
Summary
Correlated materials support many intriguing phenomena arising from quantum many-body effects. The balance between various quantum many-body interactions in these materials responds to external stimuli, resulting in novel phenomena. Understanding the competition between the microscopic processes in these materials is essential for controlling the strong correlations. Understanding the competition between the microscopic processes in these materials is essential for controlling the strong correlations Such an understanding enables designing novel functional quantum materials. In this work, we probe the origin of one such novel phenomenon discovered in 1T-TaS2, a quasi-2D material supporting charge density waves (CDWs) at room temperature.. The electrical properties of 1T-TaS2 are widely studied under various stimuli, including light.. We studied the optical properties of 1T-TaS2 and discovered a large tunability in its visible optical constants with various stimuli—light, heat, and in-plane electrical bias.. The dynamics of tunability probed at various temperatures suggested that the photon energy exciting the CDW domain boundaries drives the stacking reorganization.. We study the optical properties of 1T-TaS2 at room temperature as a function of in-plane DC and AC biases.
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