MatSci-eTalks
MatSci-eTalks
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Introduction to Materials Science: Lecture-3: Crystal defects
In this introductory lecture I discuss the various types of point defects, line defects and plane defects that occur in crystalline solids.
Speaker: Dr. Amretashis Sengupta
Website: sites.google.com/site/ascnel2015/
Переглядів: 1 984

Відео

How to use a typical HPC cluster : IBM Power PC
Переглядів 2,4 тис.4 роки тому
In this tutorial I discuss how to use a typical HPC Cluster with the example of a IBM Power PC cluster. This particular video tutorial is made for the University of North Bengal Computer Center by Dr. A. Sengupta. However users can benefit from the basic knowhow about the working of a HPC system. Speaker: Dr. Amretashis Sengupta My personal website: sites.google.com/site/ascnel2015/
Introduction to Materials Science Lecture-2: Atomic Packing Fraction
Переглядів 1,8 тис.4 роки тому
In this tutorial we will discuss about atomic packing and calculate the atomic packing factor / packing fraction in some common crystal structures. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
Creating vdW heterostructures and heterojunctions with VESTA and BURAI GUI for Quantum ESPRESSO
Переглядів 10 тис.4 роки тому
In this tutorial I have shown how you can create a MoS2-WS2 vdWh and also a planar heterostructure for calculations. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
Introduction to Materials Science: Lecture-1 : Crystal Structure
Переглядів 6 тис.4 роки тому
In these series of lectures I would introduce the basic concepts of materials science and engineering and solid state physics to the viewers. The course is structured to cater to students from both the UG and the PG level, by explaining basics and also moving on to advanced topic as the course progresses. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
About the symmetry points and Brillouin Zones for Quantum ESPRESSO calculations: an overview
Переглядів 8 тис.4 роки тому
In this video tutorial we brush up some basics about the high symmetry points and BZ in 2D crystals, which may be useful to those who are new to the field. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
Optical properties calculation with Quantum ESPRESSO: JDOS, dielectric function and theoretical EELS
Переглядів 22 тис.4 роки тому
In this video tutorial I have shown how to calculate optical properties of a 2D material (MoS2) with Quantum ESPRESSO. I have shown the methods for calculation of Joint density of states (JDOS), dielectric function and theoretical EELS, with the epsilon.x post-processing tools. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
Structure generation for Quantum ESPRESSO and optimization of bilayer graphene
Переглядів 8 тис.4 роки тому
In this tutorial I have shown how to create the structure for ESPRESSO input starting from a .CIF structure file, using PW Tools. Thereafter I have shown how to carry out a structure optimization with Quantum ESPRESSO with the example of a bilayer graphene. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
Calculating DOS, Charge density, ELF, potential with Quantum ESPRESSO
Переглядів 20 тис.4 роки тому
In this tutorial I will show how to calculate the DOS and charge density, potential and other iso-surface plots with Quntum ESPRESSO. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/home
Calculations with Quantum ESPRESSO using PWgui on Ubuntu 18.04LTS
Переглядів 11 тис.4 роки тому
In this tutorial I show how to do the SCF and bandstructure calculations for 2D MoS2 with Quantum ESPRESSO on the Ubuntu 18.04LTS platform. How PWgui can be used to prepare and input file and how to create the data output files for bandstructure plotting are also shown in this video tutorial. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
Understanding the Quantum ESPRESSO input file
Переглядів 39 тис.4 роки тому
In this tutorial I discuss in details the Quantum ESPRESSO input file structure and different cards and flags associated with it.I also show an example of an input file for monolayer MoS2 for SCF calculation. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
Installing Quantum ESPRESSO on Ubuntu 18.04LTS
Переглядів 17 тис.4 роки тому
In this video I will show how to setup Quantum ESPRESSO and some required visualization tools as Jmol, XCrysden and PWGui package for your desktop PC/ MAC running Ubuntu Linux. Linux version used : UbuntuMATE 18.04LTS Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
MoS2 bandstructure calculation with Quantum ESPRESSO-BURAI GUI
Переглядів 20 тис.4 роки тому
In this video we will see how to import a new material (MoS2) into the GUI, see the format of XYZ and CIF files, and go on to simulate the Bandstructure of MoS2. This tutorial also touches on the structure optimization technique in ESPRESSO, which will be further discussed later on. Speaker: Dr. Amretashis Sengupta Website: sites.google.com/site/ascnel2015/
Graphene Bandstructure and DOS Calculation with Quantum ESPRESSO and BURAI GUI
Переглядів 26 тис.4 роки тому
In this introductory video lecture on modelling of 2D materials I have shown the example of calculation of bandstructure and DOS of graphene, with Quantum ESPRESSO package. The BURAI 1.3 GUI has been used. Speaker: Dr. Amretashis Sengupta My website: sites.google.com/site/ascnel2015/

КОМЕНТАРІ

  • @ThECooLResearcheR
    @ThECooLResearcheR 7 місяців тому

    CAN WE DO 2D LATERAL HETEROSTRUCTURE BAND DIAGRAM HERE IN BURAI?

  • @twinklechowdhury3571
    @twinklechowdhury3571 7 місяців тому

    Sir, why are you no longer uploading your lecture series on material science? Please assist us; it has been years since you made one.🙏🙏🙏

  • @ExploringZone-mg3wq
    @ExploringZone-mg3wq 8 місяців тому

    Really a helpfull video. Sir, is EELS the actual loss function?

  • @payalsahoo9318
    @payalsahoo9318 8 місяців тому

    sir some bonds are missing in structure while opening the vesta structure in Burai

  • @payalsahoo9318
    @payalsahoo9318 8 місяців тому

    while running the band gap of the compound it is showing error. what to do sir

  • @romanpunk2396
    @romanpunk2396 8 місяців тому

    does it work for PAW?

  • @novenvision5748
    @novenvision5748 8 місяців тому

    Hoe long it takes to calculate the Charge density ????

  • @kunsahaho607
    @kunsahaho607 3 роки тому

    How and from where to get the pseudo potentials suitable for optical property calculations? which type of potentials are to be used?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      What I have shown is just for illustrative purposes, you have to do some literature search for using the best pp possible for the material concerned.

  • @Dino-kq1hz
    @Dino-kq1hz 3 роки тому

    How did you incorporate the "GGA-PBE" Exchange correlation in your input file? I can see "input_dft='pbe'" ---> Does this mean "GGA-PBE" exchange correlation is incorporated?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      You have to set input dft to pbe and also choose the correct pp for use with the input dft specified.

  • @priyambadaaiswarya1831
    @priyambadaaiswarya1831 3 роки тому

    Sir , can you tell me how to calculate Refractive index

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      If you plot the real part of dielectric function, its value at w=0 can be approximately taken as dielectric constant.

  • @priyambadaaiswarya1831
    @priyambadaaiswarya1831 3 роки тому

    Hello Sir can we use K-points {tpiba_b} for the calculation?

  • @alicanguler4761
    @alicanguler4761 3 роки тому

    Thank you so much , well-appreciated

  • @zahidurrahaman428
    @zahidurrahaman428 3 роки тому

    Thank you for this series of incredible videos. Keep up the good work professor.

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Not a professor, but thanks for your wishes and appreciation. ☺️

  • @zainabm809
    @zainabm809 3 роки тому

    Thanks a ton! Its not this simple when others explain these subjects . Keep the good work please

  • @kapilmandal2857
    @kapilmandal2857 3 роки тому

    Sir, can you please discuss on how to get the pressure dependent bandstructures for high pressure calculations?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      I suggest you create structures with different applied pressure (you have to calculate specific to your cell) and simulate them. You can try the Materials Square builder for the same.

  • @puteriintanzulaikha9477
    @puteriintanzulaikha9477 3 роки тому

    Hi sir, may I know how can I get the HOMO and LUMO? What parameter is corresponding to HOMO LUMO ? thank you

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Can you elaborate little more? Do you want to plot the states, as in an iso surface? Or just want to print the values in the output? If latter then set the nbnd flag accordingly and the HOMO and LUMO values would be printed in the out file.

    • @puteriintanzulaikha9477
      @puteriintanzulaikha9477 3 роки тому

      @@matsci-etalks5994 the latter. how to determine the value for nbnd? is there any range?

  • @puteriintanzulaikha9477
    @puteriintanzulaikha9477 3 роки тому

    Hi sir, may I know how can I get the HOMO and LUMO? What parameter is corresponding to HOMO LUMO ? thank you

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Usually depending on the material (metal/ insulator etc) you need to choose appropriately. Google it a bit, consult the manuals and choose according to your system.

  • @prabhakarolichannel9747
    @prabhakarolichannel9747 3 роки тому

    next types of PP and their use in flags and in cards........waiting to see

  • @priyambadaaiswarya1831
    @priyambadaaiswarya1831 3 роки тому

    Sir for ibrav=0 , how to set CELL_PARAMETERS{alat}

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Read the manual for more details. Also you can try using PWGui for ease of setting these and etc.

  • @deepaksingh3460
    @deepaksingh3460 3 роки тому

    How do you update the atomic positions after running the vc-relax calculations. Do you also need to update the atomic positions for a nscf calculation following scf? What output files of a vc-relax calculation are used for a scf calculation?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Manually you have to search final co ordiantes after relax calculation from output and use those for further scf or nscf calculations that you want to do.

  • @priyambadaaiswarya1831
    @priyambadaaiswarya1831 3 роки тому

    Sir how to choose k- points

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Rule of thumb is for bulk its nxnxn for 2d nxnx1 for 1d (c axis oriented say) 1x1xn

  • @hennamalakar2380
    @hennamalakar2380 3 роки тому

    Sir, I'm having problem to run the scf calculation. It says command: pw.exe -in espresso.in. can you help me to solve this?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      This could be an installation related issue, some packages/ libraries may be missing, kindly see the manuals. I am not sure what exactly the error message is.

  • @happyworld1849
    @happyworld1849 3 роки тому

    Nice initiative. Do you have pdos calculation guidelines?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Sorry not in the present tutorial no. But you an see the Espresso manual, it's not complicated.

  • @mohammadubaid6240
    @mohammadubaid6240 3 роки тому

    Sir ELF calculation is missing. Could please share the information of pp.elf.in?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      I give you a hint Just a simple change of a flag setting in the pp.x input. Google it.

  • @prabhakarolichannel9747
    @prabhakarolichannel9747 3 роки тому

    got idea about cards and flags.but in celldm(1)=.................do. why do?what is this?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Not do its d0 (zero) indivates power , like 3.0d0=3.0 !

  • @mishmash4524
    @mishmash4524 3 роки тому

    Thank you so much for your content. All your videos are beneficial. I have a query, though. I'm trying to reproduce results obtained from a paper. Among other parameters used to build their cell, they have written: 'four-layer slab was used with the atoms in the bottom two layers were fixed to their bulk positions ' Can you please help me accomplish this using BURAI?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      You can try use some simpler builder like Materials Square.

  • @sumansarkar6984
    @sumansarkar6984 3 роки тому

    Sir, the video very helpful. Can you tell me how to chose at which value of isovalue should plot Charge density, ELF.

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      It's your choice how you want to show it, but mention the value in graphs.

  • @priyankaroy6804
    @priyankaroy6804 3 роки тому

    Hello sir, thank you for making such videos. Can u please tell how to get bond length n angle using burai software. Please respond 🙏.

  • @Adam-nd8vd
    @Adam-nd8vd 3 роки тому

    A bit off topic, but we shouldn't use the same k-path for band structure and DOS. DOS requires a larger grid than the scf calculation.

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Yes that's correct, DOS involves more points, but I am giving just a demonstration and have mentioned that verbally in one of the videos. If you see the optical spectra also I am showing example with a small no. of bands. All this is because I was stuck on a off the shelf Desktop PC, so and again and again I mention viewers these are for illustrative purposes, actual calculations are much more computationally demanding. But I don't have the adequate resources for making this tutorial.

  • @alvy_._ahmed
    @alvy_._ahmed 3 роки тому

    hello sir, hope youre doing well. May i Know your computer specification? Are you running this on a virtual machine?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      No it's not virtual machine, just a Desktop, but I say again and again these are for illustrative purposes only and real precision calculations would require a very powerful workstation or preferably a cluste for larger systemsr.

  • @priyankaroy6804
    @priyankaroy6804 3 роки тому

    Thank you so much sir🙏🙏🙏🙏🙏

  • @muhammadsherazkhan2903
    @muhammadsherazkhan2903 3 роки тому

    Hello sir. I have some problem. when i finish my band calculation. so i dont have dat.gnu file. i have only band.dat file. but dont get dat.gnu.

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Hmm I am not sure why that's happening, you can convert into gnu format or for more control over the kind of output files consult the manuals. I am just giving an introductory tutorial, there are many more things that one can do.

  • @yomoenterprises2407
    @yomoenterprises2407 3 роки тому

    Excellent sir.

  • @mekrajavel718
    @mekrajavel718 3 роки тому

    Really impressed 👍

  • @darshilchodvadiya7572
    @darshilchodvadiya7572 3 роки тому

    This tutorial is very informative and useful. Sir, can you make a tutorial on absorption spectra, refractive index, excitation coefficient?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Absorption may be calculated from dielectric fn with a simple relationship. You can do it with some literature search.

  • @nagarjunapatra9516
    @nagarjunapatra9516 3 роки тому

    can i do soc scf calculation in burai ? i am not able to download full relativistic pseudopotentials into the burai. please help me regading the problem

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Sometime there's a problem with the proxy server if any. Otherwise it should download. Consult the Burai manual.

  • @sushreepaikray447
    @sushreepaikray447 3 роки тому

    Sir how did you make the input files that you have saved in the calculation file?

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      You can use text editor to manually do it, or PWgui.

  • @oxanarubinkovskaya6459
    @oxanarubinkovskaya6459 3 роки тому

    Thank you much! Could you share the calculation files of MoS2?

  • @priyambadaaiswarya1831
    @priyambadaaiswarya1831 3 роки тому

    Sir I have both quantum espresso 6.4.1 & qe 6.7 . I want to remove 6.4.1. how to do it sir??

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Google how to uninstall a program in linux. It's simple.

  • @guruprasadg1097
    @guruprasadg1097 4 роки тому

    Dear Sir, Great work and very informative. Please make a continuous video by running one quantum espresso example on HPC.

  • @devkumarthapa8234
    @devkumarthapa8234 4 роки тому

    Sir could you tell me what configuration of computer should we buy for electronic. optical and magnetic calculation of nanocrsytals

    • @matsci-etalks5994
      @matsci-etalks5994 3 роки тому

      Materials Science calculations typically need clusters, if you want to do only unit cell electronic properties calculation, get a high end workstation.

  • @learnwithme3517
    @learnwithme3517 4 роки тому

    thank you sir for this wonderful explanation

  • @thilakpeiris3252
    @thilakpeiris3252 4 роки тому

    Thank you very much, well explained and detailed.

  • @kriteshgupta7380
    @kriteshgupta7380 4 роки тому

    Thank you Sir, your content is so good for the beginners like me. Please do make one video on modelling twisted bilayer graphene using the CIF files available on the web.

  • @HIRENP
    @HIRENP 4 роки тому

    Sir, Thank you for this great explanation , keep it up. Nice video

  • @bradoquethomassales9645
    @bradoquethomassales9645 4 роки тому

    Cara, muito obrigado por ter gravado esses tutoriais. Meus parabéns pelo trabalho, e bela iniciativa a sua!

  • @SantoshKumarBehara
    @SantoshKumarBehara 4 роки тому

    Thank you for this valuable information. Could you please do a video on Nudged Elastic Band (NEB) calculations?

    • @matsci-etalks5994
      @matsci-etalks5994 4 роки тому

      I will was busy with some work, and don't have much computational resources these days. But it is in preparation.

  • @ghiyasanwar3439
    @ghiyasanwar3439 4 роки тому

    👏👏👏👏👏👏👏👏👏😊😊😊😊😊😊😊😊 Keep it dear doing outstanding

  • @danikivines2388
    @danikivines2388 4 роки тому

    Good Work Sir, Are you working on the phonon calculations?

  • @SantoshKumarBehara
    @SantoshKumarBehara 4 роки тому

    Hai sir, Again, very informative video. Recently, I have read one article in computational material science journal named “High-throughput electronic band structure calculations: Challenges and tools”. It contains the information of high symmetry k-points path for all crystal types. Is it reasonable to go with the whole path or could you please suggest the acceptable path in research publications for rhombohedral cell?

    • @matsci-etalks5994
      @matsci-etalks5994 4 роки тому

      Hint: You have to check in a material (and or structure) specific way from highly cited literature in the field. Also what you are looking for matters (say uniform / non-uniform strained systems). Sometimes you would need surface plots of CBM and VBM.