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A VERY SHORT VIDEO ABOUT TUNNELING THROUGH A SINGLE MOLECULE FROM (NURUL, NADIA & FAIHANAH)

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A VERY SHORT VIDEO ABOUT TUNNELING THROUGH A SINGLE MOLECULE FROM (NURUL, NADIA & FAIHANAH)

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INTRODUCTION OF TUNNELING THROUGH SINGLE MOLECULE 

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INTRODUCTION OF TUNNELING THROUGH SINGLE MOLECULE 

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Tunnelling through periodic molecules (2

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Tunnelling through periodic molecules (2

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1.model complex bandstructure
-A molecule composed of two types of atoms,A and B,each with 1 valence electron,arranged in the sequence ABABABAB.....
-The unit cell is AB and the distance between cells is a
2.Fermi level alignment and conductance estimates
-The current through a molecule bonded between metal electrodes is carried by electrons near the fermi level of the metals
3.Phenylene-ethylene molecules
-Phenylene-ethylene based molecules using complex bandstructures.
4.Tunnelling transport times
-uses the concept of a spin clock
-The basic idea is to introduce on imaginary pertubing magnetic field,in the barrier region only,that causes the spin of the tunelling electron to rotate.
5.Method for obtaining a complex bandstructure
-To generate a conventional band structure,one solves a standard energy eigenvalue equation for a range of chosen k points.

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-More specifically molecules that are composed of a short sequence of repeating fundamentals unit
-The electronic energy eigenstates of a periodic molecule (or any periodic system)are most conveniently taken to the Bloch states.
-The highest occupied molecular orbital (HOMO) or the lowest unoccupied molecular orbital (LUMO) may be loosely thought of as being formed from linear combinations of Bloch waves that satisfy certain boundary conditions.

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dr, vdeo kteorg x blh masukkan sebab besar sangat

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- focused entirely on the electronic structure of the molecule.

-Details about the electrodes and the electrode-molecule connection .

- To obtain more quantitative results and to deal with more general structures requires considering the entire
metalmolecule-metal system.

- Landauer is widely used to approach this problem

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- in  Landauer view, the current is produced by electrons occupying a distribution of scattering state

- a scattering state in one dimension is just, collectively, an incident wave, its reflected and transmitted parts, and its  reflected and transmitted parts, and its wavefunction in the barrier region