nextnano.NEGF - Software for
Quantum Transport

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====== Update 2017/08/01 ======

**New feature**: a combined temperature-voltage sweep can be done using the keyword "Temperature-Voltage" in the field <SweepType> of <SweepParameters> (see the example of code below). In this case, the simulation can be parallelized. <Threads> defines the number of parallel threads. Its optimal value should be the number of CPU cores available (if the available memory is sufficient) . Within each parallel temperature sweep, a serial voltage sweep is performed.

<code>
<SweepParameters>   
    <SweepType>Temperature-Voltage</SweepType>
    <MinV> 50</MinV> 
    <MaxV> 60</MaxV> 	
    <DeltaV> 2</DeltaV> 	

    <MinT> 25</MinT> 
    <MaxT> 300</MaxT> 	
    <DeltaT> 25</DeltaT> 

    <Threads>12</Threads> <!-- Parallelization for Temperature-Voltage sweep -->
</SweepParameters>
</code>
Note that for such voltage-temperature sweep, <Maximum_Number_of_Threads> in <Simulation_Parameter> should be set to 1 (combined parallelization will result in lower performances)
<code>
<Simulation_Parameter>
  ...
  <Maximum_Number_of_Threads>1</Maximum_Number_of_Threads>
</Simulation_Parameter>
</code>


At the end of the simulation, current and gain maps can be displayed.
Gain_map gives the maximum gain at each (voltage,temperature) point.
Max_Gain_frequency gives the map of the corresponding photon energy for which the gain is maximum.

{{:qcl:gainmap1.png?300 |}}
{{ :qcl:gainmap2.png?300|}}

nextnano.NEGF - Software for Quantum Transport

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nextnano.NEGF - Software for
Quantum Transport