Find information on common issues.
Ask questions and find answers from other users.
Suggest a new site feature or improvement.
Check on status of your tickets.
Band Gap value
Closed | Responses: 0
For the default simple quantum dot, the bulk band gap is given as 1.43 eV (GaAs), and the value of Eg for the quantum dot is given as 0.18 eV. This is also the energy of the absorption...
Where did spheroidal geometry go?
Closed | Responses: 2
In the introductory material, a spheroid is one of the options for geometry. It appears that this is not longer an option in the current version, is there a reason for that?
recommended viewer for vtk files
Closed | Responses: 3
Hi, I want to analyse simulated quantum dot wave functions off-line using a windows pc. For this, I have downloaded the wave function as a vtk file. Is there a recommeded viewer / tool for this...
Confusion with bandgap
The default case shows a bandgap between the ground and the first excited states (less than 1 eV for GaAs!). This is confusing, since by bandgap students usually understand the difference...
model of a truncated pyramid QD
I am trying to simulate an InAs/GaAs QD for band structure. The model of a truncated pyramid is more reality in present researches. Do you have any intention to update the simulator for this...
distinction between hole and electron states is not clear
Closed | Responses: 5
I ran a 2 band model in a dome structure with a wetting layer and it appears that I got 8 valence band states but it was NOT clear. How can I just ask for conduction band states? ...
increments on absorption graph
Closed | Responses: 1
Is it possible to change the eV increments of the absorption coefficent data in the output so that if you’re comparing three or four different quantum dots, you can easily graph them on...
Symmetry of p-states changes with the resolution of the mesh
I am running a pyramidal standard structure (no change from defaults, just chose pyramidal shape). In the simulation result the 2 p-type orbitals are aligned with the diagonal of the pyramid. ...
How can I get the total absorption/absorbance of the whole surface of a quantum dot in a QD solar cell by varying the angles theta and phi?
I was doing a research on Quantum Dot in Solar Cell and I thought your software could be very useful for my work. I was intending to vary the size and shape of quantum dots and...
Can I calculate the energies for 2 coupled dots across a thin barrier?
anisotropic effective masses
I want to simulate Bismuth which has anisotropic effective masses… how can I input that?
How i can determine input for the e dimension for pyramidical or spheroid qdot? what should be the value of Lx,Ly & Lz?
Open | Responses: 1
Doing the examples in learning module of Introduction of Quantum Dot Lab, I don’t get the same results for ground and excited states as well as the state vs eigenenergy values as they are...
I compared a free electron in a 10nm x 10nm x 10nm closed box with an analytical formula and got a very different result
I expect to get 0.011eV for the ground state quantization energy.
The tool gives me 0.040eV.
Is it a problem in my interpretation of the results or the tool is wrong?
Number of Atoms
I was trying to relate the volume size and the number of atoms in the simulation. I picked a 2nm-by-2nm-by-2nm box, but when I checked the Output Log file, it only contains 64 atoms....
Thank you for providing this great tool.
I’m trying to simulate properties of QDs in different temperatures. I wasn’t sure where in the simulation, the ‘Ambient...
How to distinct the conducting band and valance band
I am glad to use this tool. I have calculated 7 bands accordingto the default configuration. However, i can not distinct the conducting band and valvance band. Furthermore, i want to know which...
Barrier material, energy scale
Do you pretend to make a version of Quantum Dot Lab that enabe us to consider the barrier constitution? (no freestanding) As for example, self assembled http://nanohub.org/answers/question/369