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Measurements of weak localization of graphene in inhomogeneous magnetic fields

Niclas Lindvall (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; A. Shivayogimath ; Avgust Yurgens (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Jetp Letters (0021-3640). Vol. 102 (2015), 6, p. 367-371.
[Artikel, refereegranskad vetenskaplig]

Weak localization in graphene is studied in inhomogeneous magnetic fields. To generate the inhomogeneous field, a thin film of type-II superconducting niobium is put in close proximity to graphene. A deviation from the ordinary quadratic weak localization behavior is observed at low fields. We attribute this to the inhomogeneous field caused by vortices in the superconductor. The deviation, which depends on the carrier concentration in graphene, can be tuned by the gate voltage. In addition, collective vortex motion, known as vortex avalanches, is observed through magnetoresistance measurements of graphene.

Nyckelord: flux tubes, magnetoresistance, avalanches, electrons, films, Physics, im ak, 1989, jetp letters, v50, p389, im ak, 1994, physical review b, v49, p5749



Denna post skapades 2016-01-04. Senast ändrad 2016-06-29.
CPL Pubid: 229616

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik

Ämnesområden

Fysik

Chalmers infrastruktur