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Also known as Fowler-Nordheim tunneling, field emission is a form of quantum tunneling in which electrons pass through a barrier in the presence of a high electric field. This phenomenon is highly dependent on both the properties of the material and the shape of the particular cathode, so that higher aspect ratios produce higher field emission currents. The current density produced by a given electric field is governed by the Fowler-Nordheim equation .

Applications of field emission include its use as an electron source in electron microscopy, MEMS systems, and field emission displays.

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Topics: Field Emission, Field (mathematics), Fields Medal, Field Hockey...

Field (mathematics)In abstract algebra, a field is an algebraic structure in which the operations of addition, subtraction, multiplication, and division (except division by zero) may be performed and the associative, commutative, and distributive rules hold, which are famil	Fields MedalThe Fields Medal is a prize awarded to up to four mathematicians (not over forty years of age) at each International Congress of International Mathematical Union, since 1936 and regularly since 1948 at the initiative of the Canadian mathematican John Char	Field hockeyField hockey is a popular sport for men and women in many countries around the world. It is simply known as hockey in most countries, especially those in which ice hockey is not very prominent. Field hockey has several regular, prestigious international t
Field-programmable gate arrayA field-programmable gate array or FPGA is a gate array that can be reprogrammed after it is manufactured, rather than having its programming fixed during the manufacturing — a programmable logic device. FPGAs are generally slower than their ASIC counterp	Field effect transistorThe Field-Effect Transistor (FET) is a family of transistors that rely on an electric field to control the conductivity of a "channel" in a semiconductor material. FETs, like all transistors, can be thought of as voltage-controlled resistors. Most FETs ar	Field extensionIn abstract algebra, an extension of a field K is a field L which contains K as a subfield. For example, C (the field of complex numbers) is an extension of R (the field of real numbers), and R is itself an extension of Q (the field of rational numbers).
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