Tuning the conductance of Dirac fermions on the surface of a topological insulator

Details Tuning the conductance of Dirac fermions on the surface of a topological insulator Tuning the conductance of Dirac fermions on the surface of a topological insulator

2009-08-14

arxiv.org/abs/0908.2019v1

Physics

Condensed Matter

Strongly Correlated Electrons

v1 4 pages 5 figs

Scientific paper

We study the transport properties of the Dirac fermions with Fermi velocity $v_F$ on the surface of a topological insulator across a ferromagnetic strip providing an exchange field ${\mathcal J}$ over a region of width $d$. We show that the conductance of such a junction changes from oscillatory to a monotonically decreasing function of $d$ beyond a critical ${\mathcal J}$. This leads to the possible realization of a magnetic switch using these junctions. We also study the conductance of these Dirac fermions across a potential barrier of width $d$ and potential $V_0$ in the presence of such a ferromagnetic strip and show that beyond a critical ${\mathcal J}$, the criteria of conductance maxima changes from $\chi= e V_0 d/\hbar v_F = n \pi$ to $\chi= (n+1/2)\pi$ for integer $n$. We point out that these novel phenomena have no analogs in graphene and suggest experiments which can probe them.

Affiliated with

Also associated with

No associations

Rating

Tuning the conductance of Dirac fermions on the surface of a topological insulator does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Tuning the conductance of Dirac fermions on the surface of a topological insulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tuning the conductance of Dirac fermions on the surface of a topological insulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-272253