Click here for a printable version of this page.
Condensed Matter Seminars
Condensed Matter
Thursday, April 11, 2013
3:30 PM
Physics Building, Room 204
Note special time.
Note special room.

Gleb Finkelstein
[Host: Israel Klich]
Duke University
"Quantum Critical Behavior in a Resonant Level Coupled to a Dissipative Environment"

ABSTRACT:
We investigate tunneling through a resonant level embedded in a dissipative environment, which suppresses tunneling rates at low temperatures. Specifically, the resonant level is formed in a carbon nanotube quantum dot, and the dissipative environment is realized by fabricating resistive leads. For the symmetric coupling of the resonant level to the two leads, we find that the resonant peak reaches the unitary conductance e^2/h despite the presence of dissipative modes. Simultaneously, the width of the resonance tends to zero as a nontrivial power of temperature. We draw a connection between our system and a resonant tunneling in a Luttinger liquid and interpret the observed unitary resonance of vanishing width in terms of a quantum critical point (QCP). We further investigate an exotic state of electronic matter obtained by finetuning the system exactly to the QCP. Particularly striking is a quasilinear nonFermi liquid scattering rate found at the QCP, interpreted in terms of a Majorana resonant level model. 



To add a speaker, send an email to
physspeakers@Virginia.EDU.
Please include the seminar type (e.g. Condensed Matter Seminars), date, name of the speaker, title of talk, and an abstract (if available).
