QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: msg on March 9, 2011, 06:28

Title: query regarding gate and bias voltage
Post by: msg on March 9, 2011, 06:28

i want to apply a gate voltage of +0.1V and the bias voltage range is from 0 to +0.7(in case of GNRFET).i wanted to know that when i give +values of these voltages in the required fields in ATK the results are obtained for the negative values....thus how to obtain the results for the +values of Vbias and Vgate...since that is what is neede(symmetrise option is available but i need it for the value of voltage that i apply for i.e for example if i give  Vbias=0.1,the value of current and the plot is obtained for -0.1 in the I-V curve)

Title: Re: query regarding gate and bias voltage
Post by: Anders Blom on March 10, 2011, 13:50

Depending on if you set a higher voltage on the left or right electrode, the current will run in different directions. As the manual (http://quantumwise.com/documents/manuals/latest/ReferenceManual/index.html/ref.transmissionspectrum.html) states, a positive current flows when the applied voltage for the left electrode is higher than that of the right one. A positive current corresponds to the flow of charge from left to right, meaning that the flow of electrons is right-to-left (since electrons have a negative charge).