Dark optical cavity alters superconductivity

Quantum fluctuations couple to stretching bonds The post Dark optical cavity alters superconductivity appeared first on Physics World .

6 April 2026 at 08:34 pm

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An international team of researchers has demonstrated that superconductivity can be modified by coupling a superconductor to a dark electromagnetic cavity. This groundbreaking discovery opens the door to controlling a material's properties by altering its electromagnetic environment, a concept that has garnered significant attention in recent years.

Electronic structure plays a crucial role in defining many material properties, and this means that some properties can be changed by applying electromagnetic fields. Familiar examples include the destruction of superconductivity by a magnetic field and the use of electric fields to control currents in semiconductors. However, there is growing interest in how electronic properties could be controlled by placing a material in a dark electromagnetic cavity that resonates with an electronic transition in that material. Unlike traditional methods, this approach does not involve applying an external field to the material. Instead, interactions occur via quantum vacuum fluctuations within the cavity.

The researchers, led by Itai Keren, Tatiana Webb, and Dmitri Basov at Columbia University in the US, refer to this as the "Holy Grail" of cavity materials research. Their goal is to alter the properties of complex materials by engineering the electromagnetic environment. To achieve this, they created an optical cavity from a small slab of hexagonal boron nitride, which was then interfaced with a slab of κ-ET, an organic low-temperature superconductor.

The optical cavity was designed to resonate with an infrared transition in κ-ET involving the vibrational stretching of carbon–carbon bonds. Hexagonal boron nitride was chosen as the material for the cavity due to its unique properties as a hyperbolic van der Waals material. Van der Waals materials consist of stacks of atomically-thin layers, where atoms are strongly bound within each layer but only weakly bound to each other by the van der Waals force. The gaps between these layers can act as waveguides, confining light that bounces back and forth within the slab.

As a result, the slab behaves like an optical cavity with an isofrequency surface that is a hyperboloid in momentum space. Such a cavity supports a large number of modes, allowing for precise control over the electromagnetic environment. By coupling the superconductor to this dark optical cavity, the researchers were able to observe significant changes in the material's superconducting properties.

This breakthrough not only advances our understanding of superconductivity but also paves the way for new applications in quantum technologies and materials science. By harnessing the power of quantum vacuum fluctuations within a dark electromagnetic cavity, scientists can now manipulate the electronic properties of materials in unprecedented ways. This opens up a new frontier in the field of cavity materials research, offering exciting possibilities for the future of condensed matter physics and quantum engineering.

Source: Physics World

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