English

Researchers have reinvented laser free magnetic control

1120
2023-11-09 15:04:20
See translation

In a significant advancement in material physics, researchers from Germany and the United States have theoretically demonstrated that only extremely thin materials need to be α- RuCl3 can be placed in an optical cavity to control its magnetic state.


This discovery may pave the way for new methods of controlling material properties without the use of strong lasers.

The Role of Optical Vacuum Waves
It is crucial that cavity vacuum fluctuations alone are sufficient to transform the magnetic order of the material from serrated antiferromagnetism to ferromagnetism. This discovery, published in npj Computational Materials, is part of a recent trend in material physics research, which involves using strong lasers to alter the properties of magnetic materials.

By carefully adjusting the characteristics of the laser, researchers can fundamentally change the conductivity and optical properties of different materials. However, this method requires continuous stimulation of high intensity laser and is related to some practical problems, mainly due to the difficulty in preventing the material from heating up.

A New Material Control Method
Therefore, researchers are looking for methods to use light to achieve similar material control, but do not use strong lasers. It is in this context that theorists from the Max Planck Institute for Material Structure and Dynamics in Hamburg, Stanford University, and the University of Pennsylvania, Germany, have proposed a fundamentally different approach to changing the magnetism of real materials in cavities - without the use of lasers.

Their cooperation indicates that just a cavity is enough to α- The serrated antiferromagnetism of RuCl3 is transformed into ferromagnetism. Crucially, the team demonstrated that even in seemingly dark cavities, α- RuCl3 can also detect changes in the electromagnetic environment and correspondingly change its magnetic state.

in summary
This effect is purely a quantum effect, because in quantum theory, a cavity is never truly empty. On the contrary, the fluctuation of the light field causes the appearance and disappearance of light particles, which in turn affects the performance of the material.

The optical cavity limits the electromagnetic field to a very small volume, thereby increasing the effective coupling between light and materials, "said lead author EmilVi ñ asBostr ö m, a postdoctoral researcher in the MPSD theoretical group." Our research results indicate that careful design of the vacuum fluctuations in the cavity's electric field can lead to significant changes in the material's magnetic properties.

Since light excitation is not required, this method in principle bypasses the issues related to continuous laser driving. This is the first work to demonstrate cavity controlled magnetism in real materials, following previous research on cavity control in ferroelectric and superconducting materials.

Researchers hope that designing specific cavities will help them achieve elusive new stages of matter and better understand the subtle interactions between light and matter.

By carefully adjusting the characteristics of the laser, researchers can fundamentally change the conductivity and optical properties of different materials.

What is the quantum effect in this situation?
This is because in quantum theory, cavities are never truly empty. The fluctuation of the light field causes the appearance and disappearance of light particles, which in turn affects the performance of the material.

Source: Laser Network


Related Recommendations
  • New insights into the interaction between femtosecond laser and living tissue

    The N-linear optical microscope has completely changed our ability to observe and understand complex biological processes. However, light can also harm organisms. However, little is known about the mechanisms behind the irreversible disturbances of strong light on cellular processes.To address this gap, the research teams of Hanieh Fattahi and Daniel Wehner from the Max Planck Institute for Photos...

    2024-06-07
    See translation
  • Scientists are using lasers to create lunar paving blocks

    Original Hal Bowman 9000 Scientific RazorThe 3 kW laser power output on a 45 mm laser spot consolidates the interlocking structure within the EAC-1A powder bed. Source: Jens Kinst, BAMBy using lasers to melt lunar soil into stronger layered materials, it is possible to build paved roads and landing pads on the moon, according to a concept validation study in a scientific report. Although these exp...

    2023-10-14
    See translation
  • High performance optoelectronic device developer "Micro Source Photon" completes B+round financing

    Recently, Weiyuan Photon (Shenzhen) Technology Co., Ltd. (hereinafter referred to as "Weiyuan Photon") announced the completion of a B+round of financing, with investors including Yicun Capital, Chenfeng Capital, and Beijing Guoqian Investment. The specific amount has not been disclosed. According to its official website, MicroSource Photonics was founded in November 2018, with the main members...

    2024-07-23
    See translation
  • Veeco's Laser Pulse Annealing (LSA) System Selected for DRAM Evaluation

    Veeco Instruments Inc. (NASDAQ: VECO) announced today that it has delivered its Laser Spike Annealing (LSA) system to a leading semiconductor memory company for evaluation by its advanced DRAM development team. This progress not only expands Veeco's business territory in the DRAM market, but also signifies a key advancement in the development of mass production technology for next-generation DRAM ...

    11 hours ago
    See translation
  • DR Laser releases its 2024 semi annual report, achieving dual growth in revenue and profit

    A few days ago, DR laser released 2024 half-yearly report, the company realized operating income of 906 million yuan in the first half of the year, a year-on-year increase of 34.40%; net profit of 236 million yuan, a year-on-year increase of 35.51%. For the reasons of performance growth, DR laser said in the half-yearly report, the company's first half of the order continued to acceptance brough...

    2024-08-23
    See translation