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I consider most chips 2D, but it sounds like this is the closest to a true 2D chip that we've made. I also assumed we had already moved on from silicon.
The new device was made using the semiconductor molybdenum disulfide, which consists of a sheet of molybdenum atoms sandwiched between two layers of sulfur atoms. Scientists hope 2D materials such as molybdenum disulfide will allow Moore’s Law to continue once it becomes impossible to make further progress using silicon.