Re: [Wien] mBJ + SOC :: spin-orbit splitting reduction

2015-02-06 Thread Luis Ogando
Dear Martin Gmitra,

   Some time ago, we had some comments about this issue in the mailing
list. Please, take a look at
http://www.mail-archive.com/wien%40zeus.theochem.tuwien.ac.at/msg10697.html
  . Nevertheless, your specific questions should be answered by more
experienced users/developers.
   All the best,
   Luis


2015-02-05 18:46 GMT-02:00 Martin Gmitra martin.gmi...@gmail.com:

 Dear Wien2k developers,

 We are observing underestimating trend of spin-orbit coupling
 splittings of Gamma_{15} bands in zinc-blende semiconductors.

 For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
 Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
 eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
 which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
 gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
 GW+SOC calculations [PRL 96, 086405].

 In PRB 82, 205212 you present two implementations of mBJ, within
 Wien2k and VASP. Could you please provide information whether both the
 implementations provide the same spin-orbit splittings of Gamma_{15}
 states?

 In case they are the same, which part of the Becke-Johnson approach
 can be responsible for such a reduction?

 Best regards,
 Martin Gmitra
 Uni Regensburg
 ___
 Wien mailing list
 Wien@zeus.theochem.tuwien.ac.at
 http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
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 http://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/index.html

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Re: [Wien] mBJ + SOC :: spin-orbit splitting reduction

2015-02-06 Thread Peter Blaha

Hi,

Sorry, I have no idea what the SO splitting of those previous 
calculations has been.


In order to get an estimate, compare the partial charges of those 
splitted states. If there is a slight change in hybridization with 
slightly modified s,p,d character of the two atoms, it may explain the 
modified SO splitting.


I'm also not sure at all if the character of the bands using mBJ is 
better than in PBE, in fact I doubt it a little bit.


Eventually you could play with correlation, i.e. couple mBJ exchange 
with PBE correlation instead of LDA.


Am 05.02.2015 um 21:46 schrieb Martin Gmitra:

Dear Wien2k developers,

We are observing underestimating trend of spin-orbit coupling
splittings of Gamma_{15} bands in zinc-blende semiconductors.

For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
GW+SOC calculations [PRL 96, 086405].

In PRB 82, 205212 you present two implementations of mBJ, within
Wien2k and VASP. Could you please provide information whether both the
implementations provide the same spin-orbit splittings of Gamma_{15}
states?

In case they are the same, which part of the Becke-Johnson approach
can be responsible for such a reduction?

Best regards,
Martin Gmitra
Uni Regensburg
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--
Peter Blaha
Inst.Materials Chemistry
TU Vienna
Getreidemarkt 9
A-1060 Vienna
Austria
+43-1-5880115671
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Re: [Wien] mBJ + SOC :: spin-orbit splitting reduction

2015-02-06 Thread Martin Gmitra
Dear Peter,

Thanks for your answer. Could you please give me a starting hint how
to couple mBJ with PBE correlation instead LDA (I do not see any
flag, needed code modification)?

Best regards,
Martin Gmitra
Uni Regensburg

On 2/6/15, Peter Blaha pbl...@theochem.tuwien.ac.at wrote:
 Hi,

 Sorry, I have no idea what the SO splitting of those previous
 calculations has been.

 In order to get an estimate, compare the partial charges of those
 splitted states. If there is a slight change in hybridization with
 slightly modified s,p,d character of the two atoms, it may explain the
 modified SO splitting.

 I'm also not sure at all if the character of the bands using mBJ is
 better than in PBE, in fact I doubt it a little bit.

 Eventually you could play with correlation, i.e. couple mBJ exchange
 with PBE correlation instead of LDA.

 Am 05.02.2015 um 21:46 schrieb Martin Gmitra:
 Dear Wien2k developers,

 We are observing underestimating trend of spin-orbit coupling
 splittings of Gamma_{15} bands in zinc-blende semiconductors.

 For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
 Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
 eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
 which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
 gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
 GW+SOC calculations [PRL 96, 086405].

 In PRB 82, 205212 you present two implementations of mBJ, within
 Wien2k and VASP. Could you please provide information whether both the
 implementations provide the same spin-orbit splittings of Gamma_{15}
 states?

 In case they are the same, which part of the Becke-Johnson approach
 can be responsible for such a reduction?

 Best regards,
 Martin Gmitra
 Uni Regensburg
 ___
 Wien mailing list
 Wien@zeus.theochem.tuwien.ac.at
 http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
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 http://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/index.html


 --
 Peter Blaha
 Inst.Materials Chemistry
 TU Vienna
 Getreidemarkt 9
 A-1060 Vienna
 Austria
 +43-1-5880115671
 ___
 Wien mailing list
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-- 
Martin Gmitra
Institute for Theoretical Physics
University Regensburg
93040 Regensburg
Germany
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Re: [Wien] mBJ + SOC :: spin-orbit splitting reduction

2015-02-06 Thread tran

Are you using a wien2k version which is recent enough to allow keywords
(instead of numbers) in case.in0?

On Fri, 6 Feb 2015, Martin Gmitra wrote:


Dear Peter,

Thanks for your answer. Could you please give me a starting hint how
to couple mBJ with PBE correlation instead LDA (I do not see any
flag, needed code modification)?

Best regards,
Martin Gmitra
Uni Regensburg

On 2/6/15, Peter Blaha pbl...@theochem.tuwien.ac.at wrote:

Hi,

Sorry, I have no idea what the SO splitting of those previous
calculations has been.

In order to get an estimate, compare the partial charges of those
splitted states. If there is a slight change in hybridization with
slightly modified s,p,d character of the two atoms, it may explain the
modified SO splitting.

I'm also not sure at all if the character of the bands using mBJ is
better than in PBE, in fact I doubt it a little bit.

Eventually you could play with correlation, i.e. couple mBJ exchange
with PBE correlation instead of LDA.

Am 05.02.2015 um 21:46 schrieb Martin Gmitra:

Dear Wien2k developers,

We are observing underestimating trend of spin-orbit coupling
splittings of Gamma_{15} bands in zinc-blende semiconductors.

For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
GW+SOC calculations [PRL 96, 086405].

In PRB 82, 205212 you present two implementations of mBJ, within
Wien2k and VASP. Could you please provide information whether both the
implementations provide the same spin-orbit splittings of Gamma_{15}
states?

In case they are the same, which part of the Becke-Johnson approach
can be responsible for such a reduction?

Best regards,
Martin Gmitra
Uni Regensburg
___
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--
Peter Blaha
Inst.Materials Chemistry
TU Vienna
Getreidemarkt 9
A-1060 Vienna
Austria
+43-1-5880115671
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--
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Institute for Theoretical Physics
University Regensburg
93040 Regensburg
Germany
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Re: [Wien] mBJ + SOC :: spin-orbit splitting reduction

2015-02-06 Thread Martin Gmitra
Yes, I'm using recent v14.2.


On 2/6/15, t...@theochem.tuwien.ac.at t...@theochem.tuwien.ac.at wrote:
 Are you using a wien2k version which is recent enough to allow keywords
 (instead of numbers) in case.in0?

 On Fri, 6 Feb 2015, Martin Gmitra wrote:

 Dear Peter,

 Thanks for your answer. Could you please give me a starting hint how
 to couple mBJ with PBE correlation instead LDA (I do not see any
 flag, needed code modification)?

 Best regards,
 Martin Gmitra
 Uni Regensburg

 On 2/6/15, Peter Blaha pbl...@theochem.tuwien.ac.at wrote:
 Hi,

 Sorry, I have no idea what the SO splitting of those previous
 calculations has been.

 In order to get an estimate, compare the partial charges of those
 splitted states. If there is a slight change in hybridization with
 slightly modified s,p,d character of the two atoms, it may explain the
 modified SO splitting.

 I'm also not sure at all if the character of the bands using mBJ is
 better than in PBE, in fact I doubt it a little bit.

 Eventually you could play with correlation, i.e. couple mBJ exchange
 with PBE correlation instead of LDA.

 Am 05.02.2015 um 21:46 schrieb Martin Gmitra:
 Dear Wien2k developers,

 We are observing underestimating trend of spin-orbit coupling
 splittings of Gamma_{15} bands in zinc-blende semiconductors.

 For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
 Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
 eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
 which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
 gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
 GW+SOC calculations [PRL 96, 086405].

 In PRB 82, 205212 you present two implementations of mBJ, within
 Wien2k and VASP. Could you please provide information whether both the
 implementations provide the same spin-orbit splittings of Gamma_{15}
 states?

 In case they are the same, which part of the Becke-Johnson approach
 can be responsible for such a reduction?

 Best regards,
 Martin Gmitra
 Uni Regensburg
 ___
 Wien mailing list
 Wien@zeus.theochem.tuwien.ac.at
 http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
 SEARCH the MAILING-LIST at:
 http://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/index.html


 --
 Peter Blaha
 Inst.Materials Chemistry
 TU Vienna
 Getreidemarkt 9
 A-1060 Vienna
 Austria
 +43-1-5880115671
 ___
 Wien mailing list
 Wien@zeus.theochem.tuwien.ac.at
 http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
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 --
 Martin Gmitra
 Institute for Theoretical Physics
 University Regensburg
 93040 Regensburg
 Germany
 ___
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 Wien@zeus.theochem.tuwien.ac.at
 http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
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-- 
Martin Gmitra
Institute for Theoretical Physics
University Regensburg
93040 Regensburg
Germany
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Re: [Wien] mBJ + SOC :: spin-orbit splitting reduction

2015-02-06 Thread Martin Gmitra
Did you mean?
TOT   EX_LDA  EC_PBE VX_MBJ  VC_PBE

What does it mean if one takes ?
TOT   EX_PBE  EC_PBE VX_MBJ  VC_PBE

Thanks,
Martin

On Fri, Feb 6, 2015 at 5:45 PM, Martin Gmitra martin.gmi...@gmail.com wrote:
 Yes, I'm using recent v14.2.


 On 2/6/15, t...@theochem.tuwien.ac.at t...@theochem.tuwien.ac.at wrote:
 Are you using a wien2k version which is recent enough to allow keywords
 (instead of numbers) in case.in0?

 On Fri, 6 Feb 2015, Martin Gmitra wrote:

 Dear Peter,

 Thanks for your answer. Could you please give me a starting hint how
 to couple mBJ with PBE correlation instead LDA (I do not see any
 flag, needed code modification)?

 Best regards,
 Martin Gmitra
 Uni Regensburg

 On 2/6/15, Peter Blaha pbl...@theochem.tuwien.ac.at wrote:
 Hi,

 Sorry, I have no idea what the SO splitting of those previous
 calculations has been.

 In order to get an estimate, compare the partial charges of those
 splitted states. If there is a slight change in hybridization with
 slightly modified s,p,d character of the two atoms, it may explain the
 modified SO splitting.

 I'm also not sure at all if the character of the bands using mBJ is
 better than in PBE, in fact I doubt it a little bit.

 Eventually you could play with correlation, i.e. couple mBJ exchange
 with PBE correlation instead of LDA.

 Am 05.02.2015 um 21:46 schrieb Martin Gmitra:
 Dear Wien2k developers,

 We are observing underestimating trend of spin-orbit coupling
 splittings of Gamma_{15} bands in zinc-blende semiconductors.

 For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
 Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
 eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
 which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
 gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
 GW+SOC calculations [PRL 96, 086405].

 In PRB 82, 205212 you present two implementations of mBJ, within
 Wien2k and VASP. Could you please provide information whether both the
 implementations provide the same spin-orbit splittings of Gamma_{15}
 states?

 In case they are the same, which part of the Becke-Johnson approach
 can be responsible for such a reduction?

 Best regards,
 Martin Gmitra
 Uni Regensburg
 ___
 Wien mailing list
 Wien@zeus.theochem.tuwien.ac.at
 http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
 SEARCH the MAILING-LIST at:
 http://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/index.html


 --
 Peter Blaha
 Inst.Materials Chemistry
 TU Vienna
 Getreidemarkt 9
 A-1060 Vienna
 Austria
 +43-1-5880115671
 ___
 Wien mailing list
 Wien@zeus.theochem.tuwien.ac.at
 http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
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 --
 Martin Gmitra
 Institute for Theoretical Physics
 University Regensburg
 93040 Regensburg
 Germany
 ___
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 --
 Martin Gmitra
 Institute for Theoretical Physics
 University Regensburg
 93040 Regensburg
 Germany
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Re: [Wien] mBJ + SOC :: spin-orbit splitting reduction

2015-02-06 Thread Peter Blaha

Look into the UG (lapw0).
One can now not only specify a shortcut for a particular functional
(VXC_MBJ), but also Ex, Ec, Vx and Vc individually.
You can specify whatever you want for Ex and Ec, but Vx and Vc are the 
important parts.

I'm abroad and cannot check the exact syntax given in the UG.

Am 06.02.2015 um 17:25 schrieb Martin Gmitra:

Dear Peter,

Thanks for your answer. Could you please give me a starting hint how
to couple mBJ with PBE correlation instead LDA (I do not see any
flag, needed code modification)?

Best regards,
Martin Gmitra
Uni Regensburg

On 2/6/15, Peter Blaha pbl...@theochem.tuwien.ac.at wrote:

Hi,

Sorry, I have no idea what the SO splitting of those previous
calculations has been.

In order to get an estimate, compare the partial charges of those
splitted states. If there is a slight change in hybridization with
slightly modified s,p,d character of the two atoms, it may explain the
modified SO splitting.

I'm also not sure at all if the character of the bands using mBJ is
better than in PBE, in fact I doubt it a little bit.

Eventually you could play with correlation, i.e. couple mBJ exchange
with PBE correlation instead of LDA.

Am 05.02.2015 um 21:46 schrieb Martin Gmitra:

Dear Wien2k developers,

We are observing underestimating trend of spin-orbit coupling
splittings of Gamma_{15} bands in zinc-blende semiconductors.

For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
GW+SOC calculations [PRL 96, 086405].

In PRB 82, 205212 you present two implementations of mBJ, within
Wien2k and VASP. Could you please provide information whether both the
implementations provide the same spin-orbit splittings of Gamma_{15}
states?

In case they are the same, which part of the Becke-Johnson approach
can be responsible for such a reduction?

Best regards,
Martin Gmitra
Uni Regensburg
___
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--
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Inst.Materials Chemistry
TU Vienna
Getreidemarkt 9
A-1060 Vienna
Austria
+43-1-5880115671
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--
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Inst.Materials Chemistry
TU Vienna
Getreidemarkt 9
A-1060 Vienna
Austria
+43-1-5880115671
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Re: [Wien] mBJ + SOC :: spin-orbit splitting reduction

2015-02-06 Thread tran

choosing EX_LDA or EX_PBE won't affect the band structure, but only
the total energy.

On Fri, 6 Feb 2015, Martin Gmitra wrote:


Did you mean?
TOT   EX_LDA  EC_PBE VX_MBJ  VC_PBE

What does it mean if one takes ?
TOT   EX_PBE  EC_PBE VX_MBJ  VC_PBE

Thanks,
Martin

On Fri, Feb 6, 2015 at 5:45 PM, Martin Gmitra martin.gmi...@gmail.com wrote:

Yes, I'm using recent v14.2.


On 2/6/15, t...@theochem.tuwien.ac.at t...@theochem.tuwien.ac.at wrote:

Are you using a wien2k version which is recent enough to allow keywords
(instead of numbers) in case.in0?

On Fri, 6 Feb 2015, Martin Gmitra wrote:


Dear Peter,

Thanks for your answer. Could you please give me a starting hint how
to couple mBJ with PBE correlation instead LDA (I do not see any
flag, needed code modification)?

Best regards,
Martin Gmitra
Uni Regensburg

On 2/6/15, Peter Blaha pbl...@theochem.tuwien.ac.at wrote:

Hi,

Sorry, I have no idea what the SO splitting of those previous
calculations has been.

In order to get an estimate, compare the partial charges of those
splitted states. If there is a slight change in hybridization with
slightly modified s,p,d character of the two atoms, it may explain the
modified SO splitting.

I'm also not sure at all if the character of the bands using mBJ is
better than in PBE, in fact I doubt it a little bit.

Eventually you could play with correlation, i.e. couple mBJ exchange
with PBE correlation instead of LDA.

Am 05.02.2015 um 21:46 schrieb Martin Gmitra:

Dear Wien2k developers,

We are observing underestimating trend of spin-orbit coupling
splittings of Gamma_{15} bands in zinc-blende semiconductors.

For instance in GaAs, the Gamma_{15v} splits to Gamma_{8v} and
Gamma_{7v} by the values of about 0.29 eV, while experiment gives 0.34
eV. PBE calculations gives 0.32 eV. Similar one sees for Gamma_{15c}
which splits due to spin-orbit to Gamma_{8c} and Gamma_{7c} where mBJ
gives 0.156 eV and PBE 0.181 eV. This one can compare to 0.174 eV from
GW+SOC calculations [PRL 96, 086405].

In PRB 82, 205212 you present two implementations of mBJ, within
Wien2k and VASP. Could you please provide information whether both the
implementations provide the same spin-orbit splittings of Gamma_{15}
states?

In case they are the same, which part of the Becke-Johnson approach
can be responsible for such a reduction?

Best regards,
Martin Gmitra
Uni Regensburg
___
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--
Peter Blaha
Inst.Materials Chemistry
TU Vienna
Getreidemarkt 9
A-1060 Vienna
Austria
+43-1-5880115671
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--
Martin Gmitra
Institute for Theoretical Physics
University Regensburg
93040 Regensburg
Germany
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--
Martin Gmitra
Institute for Theoretical Physics
University Regensburg
93040 Regensburg
Germany

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