What is the difference between the band structures plotted as E vs k (-pi/a to +pi/a) and E vs k (where k is from M to K or K' edge of brillouin zone?

I know that when we plot band structure i.e E vs. k, the shape is parabolic. But when we plot band structure for E vs k, where k is different points (gamma, M, K or K') of Brillouin zone edge...

06 July 2019 1,023 3 View

What is the concept of wave-packet?

I know that wave-packet is the super-imposed form of the waves. It is created when some waves have interference and a particle (say electron) can be represented by a wave-packet. I am bit confused...

06 July 2019 9,600 34 View

What is the physical significance and consequence of zero density of states at Dirac point in Graphene or Topological Insulators?

Generally we say that the density of states (DOS) at Fermi level contribute to many phenomenon. However in the Dirac cone DOS is zero at Fermi level. What does it mean and what are its...

06 July 2019 7,426 4 View

Why molecular beam epitaxy (MBE) is not called atomic beam epitaxy and how it differes from sputtering in growth sense?

Why molecular beam epitaxy (MBE) is not called atomic beam epitaxy and how it differs from sputtering in growth sense? Can one grow sample in sputtering instead of MBE without changing any growth?...

03 April 2019 8,240 10 View

Why holes effective mass and mobility are higher than electron's?

electron and hole effective mass

01 February 2019 7,785 5 View

Is oxidation reversible process?

Can an oxidized thin film sample get de-oxidized if put in the vacuum?

31 December 2018 8,179 14 View

Why do we call spin momentum locking in graphene as Psuedo spin-momentum locking?

why in case of Graphene and other 2D materials spin is called as psuedospin? and how to we get other degree of freedom called valley degree of freedom? Please give simple explanation! Thank you

09 October 2018 6,851 3 View

Why topological insulator (TIs) AFM image show triangular shape terrace while unitcell is hexagonal?

Why in TIs, AFM image show triangular shaped terraces instead of hexagonal shaped? The terrace height could be 5-8 nm. does it means that there is no growth (no material) between two triangle gap...

09 October 2018 7,120 2 View

What is physical interpretation of activation energy in metals and semiconductors transport?

What is physical meaning of activation energy? I know that the activation energy can be estimated by Arrhenius equation. It has been observed that the activation energy is usually less than the...

09 October 2018 4,288 5 View

How to etch TGMR resist (-ve type)?

Can someone help me in etching TGMR? I try chemical etching but not able to etch it. Is there another way?

06 July 2018 9,649 1 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

How climate change will influences human and animal behavioral change?

The role of climate change influencing the human behavior as well as economics interest

01 June 2021 0 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Why can't make aluminum nitride film successfully by use sputter?

We use reactive sputtering process to make aluminum nitride film, and want to make c-axis aluminum nitride film on a silicon substrate, but the crystal orientation cannot be seen with...

03 March 2021 7,975 3 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View