currentvoltage diagram
dear all I have done my project using Kwant and I have drawn a conductanceenergy diagram for the system. The question I have is how can I get the currentvoltage diagram? thanks Leo
dear Leo,
If you have calculated the conductance G(E) of a 2 terminal device, the current I at finite voltage V is given by
I = Integral dE G(E) [ f(Emu_L)  f(Emu_R) ] where mu_L and mu_R are the chemical potential of the two electrodes, f(E) is the Fermi function. mu_L  mu_R = eV where V is the voltage drop across the devices.
Beware that this equation assumes a NON INTERACTING system and can lead to physically wrong results. (It neglects the electrostatic which becomes almost always relevant at finite bias).
Best regards, Xavier
Le 30 juin 2020 à 13:37, loojoo026@gmail.com loojoo026@gmail.com a écrit :
dear all I have done my project using Kwant and I have drawn a conductanceenergy diagram for the system. The question I have is how can I get the currentvoltage diagram? thanks Leo
Thanks for your prompt reply Mr. Wintal. I did not calculate the Green function and obtained the GE diagram using the transmission method introduced in the Green function class. Another method introduced in this class is conductance_matrix (), ( https://kwantproject.org/doc/1/reference/generated/kwant.solvers.common.Gre... ) which relates the current vector to the voltage vector. Can I use this method and get to the IV diagram? I also want to check the temperature parameter in this system and see the device's behavior under different temperatures. thanks Leo
On Tue, Jun 30, 2020 at 4:29 PM Xavier Waintal xavier.waintal@cea.fr wrote:
dear Leo,
If you have calculated the conductance G(E) of a 2 terminal device, the current I at finite voltage V is given by
I = Integral dE G(E) [ f(Emu_L)  f(Emu_R) ] where mu_L and mu_R are the chemical potential of the two electrodes, f(E) is the Fermi function. mu_L  mu_R = eV where V is the voltage drop across the devices.
Beware that this equation assumes a NON INTERACTING system and can lead to physically wrong results. (It neglects the electrostatic which becomes almost always relevant at finite bias).
Best regards, Xavier
Le 30 juin 2020 à 13:37, loojoo026@gmail.com loojoo026@gmail.com a
écrit :
dear all I have done my project using Kwant and I have drawn a conductanceenergy
diagram for the system.
The question I have is how can I get the currentvoltage diagram? thanks Leo
Sorry, I made a mistake in my previous email I wrote the correction of the previous email below:
Thanks for your prompt reply Mr. Wintal.
I did not calculate the conductance and obtained the GE diagram using the transmission method introduced in the Green function class. Another method introduced in this class is conductance_matrix (), ( https://kwantproject.org/doc/1/reference/generated/kwant.solvers.common.Gre... ) which relates the current vector to the voltage vector. Can I use this method and get to the IV diagram? I also want to check the temperature parameter in this system and see the device's behavior under different temperatures.
thanks Leo
On Wed, Jul 1, 2020 at 12:48 PM Loo Joo loojoo026@gmail.com wrote:
Thanks for your prompt reply Mr. Wintal. I did not calculate the Green function and obtained the GE diagram using the transmission method introduced in the Green function class. Another method introduced in this class is conductance_matrix (), ( https://kwantproject.org/doc/1/reference/generated/kwant.solvers.common.Gre... ) which relates the current vector to the voltage vector. Can I use this method and get to the IV diagram? I also want to check the temperature parameter in this system and see the device's behavior under different temperatures. thanks Leo
On Tue, Jun 30, 2020 at 4:29 PM Xavier Waintal xavier.waintal@cea.fr wrote:
dear Leo,
If you have calculated the conductance G(E) of a 2 terminal device, the current I at finite voltage V is given by
I = Integral dE G(E) [ f(Emu_L)  f(Emu_R) ] where mu_L and mu_R are the chemical potential of the two electrodes, f(E) is the Fermi function. mu_L  mu_R = eV where V is the voltage drop across the devices.
Beware that this equation assumes a NON INTERACTING system and can lead to physically wrong results. (It neglects the electrostatic which becomes almost always relevant at finite bias).
Best regards, Xavier
Le 30 juin 2020 à 13:37, loojoo026@gmail.com loojoo026@gmail.com a
écrit :
dear all I have done my project using Kwant and I have drawn a
conductanceenergy diagram for the system.
The question I have is how can I get the currentvoltage diagram? thanks Leo
Dear Sir, In the equation I = Integral dE G(E) [ f(Emu_L)  f(Emu_R) ] How I can know the individual mu_L and mu_R values which can be used to calculate I.
Thanking You Ajit
participants (4)

Loo Joo

loojoo026＠gmail.com

sahu.ajit92＠gmail.com

Xavier Waintal