More revision tutes

Is it possible to have a couple more tutes to go through the practice questions we have? I.e. maybe the usual tute time on wednesday this week and next week, and maybe a third if there is a consensus?

Optional tutorial thursday 1pm

Interaction room

Appliation of quantum hall effect in electronic devices

http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4373747

Half integer quantum hall effect in graphene

Half integer quantum hall effect in is one of the most outstanding discovery in condensed matter in the second half of the twenty first century. The difference emerges from the unique electronic properties of graphene, which reveals
electron–hole degeneracy and vanishing carrier mass near the point of charge neutrality. This unique behaviour of electrons opens up for new application in carbon based electric and magnetic field-effect technology, for example, aplication in ballistic or metallic/semiconducting graphene ribbon devices and electric field effective spin transport devices using a spin-polarized edge state.
http://www.nature.com/nature/journal/v438/n7065/abs/nature04235.html

Some sites on thermoelectric devices

http://www.novelconceptsinc.com/calculators.htm

http://www.tec-microsystems.com/EN/Intro_Thermoelectric_Coolers.html

BECs and BCS

http://jfi.uchicago.edu/~qchen/Papers/PhysRep412p1-88.pdf

This is a (lengthy) paper which looks at some similarities/differences between BECs and BCS theory for superconductors. Its a bit long to go through all of it, but the introduction is quite interesting in raising some ideas, about how BECs and BCS superconductors show properties which are two sides of the same coin.

Presentation marks

3 digits are last 3 numbers of student ID
marks are out of ten

404       5
335       5
050      5.5
658      4
459      6
344      5
172     8.5
370     7.5
677      6

Types of superconductors

superconductors is divided to two types depending on it's temperature:

1- Low temperature superconductors(LTC): it is called also conventional superconductors such as Mercury and this type characterized by low critical temperature(Tc).

2- High temperature superconductors(HTS):this type characterized by high critical temperature(Tc).for example,(La2 Ba1 Cu O4)

kondo effect and kondo lattice

Kondo effect is one of the most significant feature of heave fermion material. It is basiclly , as I said in my presentation, the increasing of resistivity which caused by the interaction between the spin of conduction electron and the spin of impurity.At zero temperature, the spin of conduction electron will make asinglit with the spin of impurity .So, the resistivity p is propotional to log (Tf/T) and in real system the resistivity will be finite.
Kondo lattice appears when we have more impurities in the system and hence the intraction between impurites is taken into account as well as the intraction between conduction electron with impurity to calculate the resistivity.Actually, now kondo effect depend on the spin of impurities (ferromagnet or antiferromagnet)and the strength btween them.

Course evaluation and optional tute

I forgot to get you to fill out the course evaluation. Sorry.
Could we do that at 1pm today in the interaction room as part of the optional tutorial?
Those who come I will make it worthwhile....