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CATEGORIES:SciSoc – Cambridge University Scientific Society
SUMMARY:When the Quantum World Breaks Through and Resistan
 ce Becomes Quantized - Sir Michael Pepper FREng FR
 S - Emeritus Professor of Physics\, Cavendish Labo
 ratory
DTSTART;TZID=Europe/London:20231127T180000
DTEND;TZID=Europe/London:20231127T193000
UID:TALK205345AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/205345
DESCRIPTION:The great power of semiconductor technology is wel
 l known for having given us modern Information Tec
 hnology and all that flows from it. In addition\, 
 modern semiconductor structures can be developed t
 o investigate fundamental aspects of physics which
  are not accessible using naturally occurring soli
 ds. In this talk examples will be given\, in parti
 cular the creation of devices where electrons are 
 restricted to one- dimension when it is found that
  a quantized staircase appears in which the conduc
 tance takes values of 2ne 2 /h\, where n is an int
 eger referring to the number of levels and the fac
 tor of 2 arises from the spin degeneracy. One of t
 he characteristics of many aspects of electron tra
 nsport in solids is that we can explain results by
  ignoring the strong repulsion between electrons. 
 In one-dimension the mutual interaction can play a
  dominant role. This is particularly the case in c
 onsidering the transition regime between 1D and 2D
 \, two dimensions\, which until recently was not e
 xplored in detail. However theory predicts that as
  the confinement weakens the carriers can move to 
 the sides and adopt a zig-zag configuration to dec
 rease the electron-electron repulsion. An unexpect
 ed feature of this particular electron configurati
 on is that sometimes the electrons no longer behav
 e as if they had the normal charge\, e\, but rathe
 r a fraction of that value such as e/5 or 2e/5. Si
 mple theoretical concepts will be presented to exp
 lain these features.
LOCATION:Wolfson Lecture Theatre\,  Department of Chemistry
 \, Lensfield Road
CONTACT:Drishtant Chakraborty
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