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SUMMARY:Mapping a non-linear Luttinger Liquid using 1D-2D magnetotunelling
  spectroscopy - Pedro Vianez\, Cavendish Laboratory\, University of Cambri
 dge 

DTSTART:20180516T130000Z
DTEND:20180516T140000Z
UID:TALK106180@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:One-dimensional (1D) systems behave in a significantly differe
 nt way from their higher-dimensional counterparts as electron-electron int
 eractions can now no longer be neglected. The Tomonaga-Luttinger Liquid (T
 LL) model is a theory that describes such systems. This model makes a numb
 er of predictions\, such as spin-charge separation and suppression of tunn
 elling conductance at zero bias\, both of which have been experimentally o
 bserved. It makes however some simplifications\, such as assuming 1D syste
 ms of infinite length and only considering low-energy excitations.\n
Rec
 ent theoretical work has focused on extending the TLL theory to include hi
 gher energy excitations and finite length systems. This led to the predict
 ion that\, at higher order excitations\, ‘replica’ parabolas with high
 er momenta should be observed\, in addition to the simple single-particle 
 parabolic dispersion. My work focuses on the experimental detection and qu
 antification of these higher order excitations using the method of 1D-2D t
 unnelling spectroscopy in order to map the dispersion of the system.\n
I
 n this talk I will report on current progress including design and fabrica
 tion of one-layered and two-layered semiconductor devices with an array of
  1D wires. I will also present preliminary data showing successful operati
 on of the gates\, as well as discussing our technique for making air bridg
 es.\n

[1] Jompol et al.\, 2009 Science\, 325\, 597–601.
[2] Tsypl
 yatyev et al.\, 2015\, Phys. Rev. Lett.\, 114\, 196401
[3] Tsyplyatyev e
 t al.\, 2016\, Phys. Rev. B\, 93\, 075147\n
LOCATION:Mott Seminar Room (Mott Building Room 531)\, Cavendish Laboratory
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