This process can occur when a sufficiently strong electric field is applied to the material, causing the free charge carriers to gain enough energy to collide with and ionize other atoms or molecules, thereby generating additional charge carriers. These newly generated charge carriers can then go on to ionize other atoms or molecules, creating a chain reaction that results in an exponential growth in the number of free charge carriers and a corresponding decrease in the material's resistance.
As the electric field strength increases, the probability of quantum avalanche also increases, eventually reaching a critical point where the material undergoes a sudden transition from a nonconductor to a conductor.
This transition is accompanied by a sharp drop in the material's resistance and a corresponding increase in its conductivity. The critical electric field strength required for quantum avalanche to occur depends on the material's properties, such as its bandgap, effective mass, and dielectric constant.
Quantum avalanche plays a crucial role in various electronic devices and phenomena, such as Zener diodes, avalanche photodiodes, and metal-insulator-metal (MIM) tunnel junctions.
In Zener diodes, quantum avalanche is utilized to achieve a stable voltage reference, while in avalanche photodiodes, it enables the detection of low-intensity light by amplifying the signal through the multiplication of charge carriers. MIM tunnel junctions, on the other hand, rely on quantum avalanche to achieve a high resistance state in non-volatile memory devices.
