"Phonon Computer" uses heat treatment information (Figure)

Legend: Thermal transistors control heat flow. When the switch is turned on, heat passes between the S terminal and the D terminal, and little or no heat is passed when the switch is turned off. G is the control terminal.

According to the physorg website reported on November 2, 2007, most computers now use electronics to carry information, while theoretical optical computers use photons. Recently, Singaporean physicists have proposed a third type of computer: "phonon computer", which uses the heat carried by phonons to play an electronic-like role.

Professor Li Baowen from the National University of Singapore said, “There is a lot of calories, which is often regarded as useless and harmful to information processing. The value of our paper is that we prove that in addition to the existing electrons and photons, phonons can also bear the burden. The ability to carry information. This provides another way to process information. In addition, heat can be controlled."

Professor Li of the National University of Singapore and his colleague Wang Lei demonstrated how to create thermal logic gates for future phononic computers. Their research results were published in the latest issue of Physical Review Letters.

A logic gate is a basic element of a computer that performs the function of processing one or more logic inputs to create a single logical output. In electronic logic gates, the inputs and outputs are represented by different voltages. However, in a thermal logic gate, the inputs and outputs are represented by different temperatures. The key element of the logic gate is the thermal transistor (the research team led by Professor Li invented the thermal transistor in 2006). The thermal transistor can perform a similar function of the field effect transistor controlling the current. The thermal transistor consists of two fragile terminals and a control terminal.

Professor Li said, “Like all other theoretical models, we use a thermal library to create heat, and atoms or molecules move freely. In order to create heat, you don't need much extra power. Temperature differences will generate heat.”

According to the researchers' model, heat is made by lattice vibration. When the vibration ranges of the two terminals coincide, their overlap will generate heat flow. For example, when the two vibration ranges overlap, heat can easily flow between the two terminals, representing 'on'. When the vibration range does not overlap, only a very small amount of heat (or no heat) passes, representing 'off'. The 'negative differential thermal resistance' (NDTR) is generated when the vibrational range of the terminal interface particles is harmonically adjusted and detuned, producing a stable 'on' and 'off' state, making thermal logic operation possible.

Professor Li said, “As we stated in the article “Physical Review Letters”, all these logic gate functions can only be obtained when the system has a so-called no or very large response. Our consciousness is that the large temperature difference (change) will be A small heat flow is generated.” The research team led by Professor Li discovered the phenomenon of “negative differential thermal resistance” in 2006.

The researchers demonstrated how to use different thermal transistors to build different thermal logic gates, such as a signal repeater. The signal repeater "digitizes" the heat input so that when the temperature is higher or lower than the threshold, the output is in an "on" or "off" state with no intermediate state. By connecting a few thermal transistors together, the researchers obtained a near-ideal transponder. In addition to the signal repeaters, they also invented a non-gate that reverses the input signal and created an AND gate from the same thermal transistor model. Although the current model can simply demonstrate the feasibility of a thermal logic gate, Wang and Li predict that using nanotechnology to create an experimental facility will not be too far away. They pointed out that another thermal device, the solid-state thermal rectifier, was experimentally demonstrated in 2006 only a few years after the theoretical model was proposed.

Li said, "One of the advantages of phononic computers is that we don't need to consume a lot of power. We can use electronic devices to generate or use the rich heat provided by nature to do useful work. Another advantage is that one day people can control and wisely Using heat, I can save a lot of energy, which is also a big problem facing the world."

The original English link can be found at: http://

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