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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3633
DTSTART:20150216T230000Z
DTEND:20150217T000000Z
DTSTAMP:20260416T145043Z
LAST-MODIFIED:20150214T155229Z
LOCATION:5280 Chamberlin
SUMMARY:Custom low-dimensional material systems explored from atom to 
 bulk \, R. G. Herb Condensed Matter Seminar\, Adina Luican-Mayer\, Arg
 onne National Lab\, Center for Nanoscale Materials
DESCRIPTION:The ability to controllably layer atomically thin crystals
  into custom-made materials holds promise for realizing physical syste
 ms with distinct properties\, previously inaccessible. The experimenta
 l results described in this talk seek to uncover the unique nature of 
 the charge carriers in such few-atoms-thick materials as well as effec
 ts that interlayer coupling and disorder have on their properties. Fir
 stly\, I will discuss scanning tunneling microscopy (STM) and spectros
 copy (STS) experiments performed on graphene systems at low temperatur
 es and in magnetic field. These techniques give access\, down to atomi
 c scales\, to structural information as well as to the density of stat
 es.  We find that twisting graphene layers away from the equilibrium B
 ernal stacking leads to the formation of Moiré patterns and results i
 n a system with novel electronic properties tuned by the twist angle. 
 Moreover\, we study Landau quantization in graphene and its dependence
  on charge carrier density. Performing spatially resolved STM/STS we d
 emonstrate the true discrete quantum mechanical electronic spectrum wi
 thin the Landau level band near an impurity in graphene in the quantum
  Hall regime. Secondly\, I will discuss temperature-dependent Raman sp
 ectroscopy measurements that demonstrate how the number of layers in a
  crystal of 1T-TaS2 determines the different types of charge density o
 rder in this material. 
URL:https://www.physics.wisc.edu/events/?id=3633
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