Messages

1

Scripts, Tutorials and Applications / Re: Boundary Conditions for above and below the gate for my DEVICE?

« on: July 1, 2012, 13:59 »

Thanks Norland, for detailed and effective reply !! 

2

Scripts, Tutorials and Applications / Re: Determining Work Function of Metallic/Dielectric Regions for Gate?

« on: June 18, 2012, 06:00 »

But without knowing the work function of this so called electrostatic region, how can one anticipate the changes of I-V as we move from two terminal to three terminal device with zero gate bias ?

3

General Questions and Answers / Re: Physical significance of Device Density of States (DDOS) ?

« on: June 13, 2012, 17:32 »

Thanks Zh and Blom for your invaluable replies !!

4

Scripts, Tutorials and Applications / Re: How to calculate DOS/band diagram of scattering region for different gate bias.

« on: June 13, 2012, 17:25 »

Thanks Dr. Blom for the reply and helpful link !!

5

General Questions and Answers / Re: Physical significance of Device Density of States (DDOS) ?

« on: June 13, 2012, 08:46 »

Are you certain at the point that device DOS is just for scattering or center region and not for the device I tried to find this in the reference that you gave me (http://quantumwise.com/documents/manuals/latest/ReferenceManual/XHTML/ref.devicedensityofstates.html). However, I could not find it anywhere mentioned. If it is the case, that would be answer to my other question that I posted on the forum (http://quantumwise.com/forum/index.php?topic=1645.msg8137;topicseen#msg8137).
Also, why the application of either the gate or electrodes voltage changes the amplitude of DDOS peaks. I thought it just shifts the DOS peaks in energy?

6

Scripts, Tutorials and Applications / Re: How to calculate DOS/band diagram of scattering region for different gate bias.

« on: June 12, 2012, 15:31 »

Or please suggest me alternative ways to explain the I-V characteristics at different gate biases. I would highly appreciate your replies and suggestions !! 

7

General Questions and Answers / Re: Variation of E-k diagram for the smallest unit cell to large unit cell bulk?

« on: June 12, 2012, 15:24 »

Thanks Zh !! for your detailed and helpful reply 

8

General Questions and Answers / Re: Physical significance of Device Density of States (DDOS) ?

« on: June 12, 2012, 15:22 »

I would really appreciate your answers and suggestions. 

9

General Questions and Answers / Physical significance of Device Density of States (DDOS) ?

« on: June 11, 2012, 06:17 »

Hi everyone,
Can anyone tell me the interpretation of the DDOS, is the result of the DOS alignment between electrodes and central region at different biases or just the DOS of the entire device. Why does it vary with respect to the gate or electrodes biases?
Can it DDOS be used for the explanation of the I-V characteristics other than Transmission spectrum?

10

Scripts, Tutorials and Applications / How to calculate DOS/band diagram of scattering region for different gate bias.

« on: June 11, 2012, 06:11 »

Hello everyone,
Please help me find out the DOS and band diagram variation corresponding to the scattering region of any MOSFET like device at different gate biases?

11

General Questions and Answers / Variation of E-k diagram for the smallest unit cell to large unit cell bulk?

« on: June 11, 2012, 06:05 »

Hi everyone,
Can someone help me explain the variation of band gap value (Eg), its location with respect to Fermi level, the curvature of valence band minimum and conduction band maximum  and number of valence (conduction) bands below (above) the Fermi level as the bulk grows from smallest unit cell to the unit cell containing more number of smallest unit cells ?

12

General Questions and Answers / Re: Total Energy Interpretation? Total Energy per Unit Cell or per Atom or per bulk.

« on: May 23, 2012, 05:14 »

Thanks !! That's what I was about to ask next 

13

General Questions and Answers / Total Energy Interpretation? Total Energy per Unit Cell or per Atom or per bulk.

« on: May 22, 2012, 18:54 »

Hi everyone,

Can someone please explain me the interpretation of 'Total Energy' ? Is it the total energy per Unit Cell or per atom or per whole bulk repeated infinitely as unit cell does ?

14

General Questions and Answers / Re: Details upon Transmission Spectrum Calulation from ATK-DFT package

« on: May 20, 2012, 08:27 »

Thanks Norland, for providing me these many resources. However I was looking at the Manual: http://www.quantumwise.com/documents/manuals/latest/ReferenceManual/index.html/ref.transmissionspectrum.html but I could only find out about the calculation of current and conductance but nothing is mentioned (No formula is given) about the calculation of Transmission Spectrum itself.

15

General Questions and Answers / Details upon Transmission Spectrum Calulation from ATK-DFT package

« on: May 19, 2012, 18:44 »

Hi everyone,
I want to know the physics behind the calculation of Transmission Spectrum from DFT. Please give me the details or suggest me some reference paper for the same.