Bulletin of the American Physical Society
APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012; Boston, Massachusetts
Session Q29: Focus Session: Topologically Protected Qubits II
11:15 AM–2:15 PM,
Wednesday, February 29, 2012
Sponsoring Unit: GQI
Chair: Roman Lutchyn, Microsoft
Abstract ID: BAPS.2012.MAR.Q29.10
Abstract: Q29.00010 : Detecting a Majorana-Fermion Zero Mode Using a Quantum Dot*
1:27 PM–1:39 PM
Preview Abstract Abstract
Dong E. Liu
Harold U. Baranger
We propose an setup for detecting a Majorana zero mode consisting of a spinless quantum dot coupled to the end of a p-wave superconducting nanowire . The conductance through the dot is monitored by adding two external leads. We find that the Majorana bound state at the end of the wire strongly influences the conductance through the quantum dot: driving the wire through the topological phase transition causes a sharp jump in the conductance by a factor of 1/2. In the topological phase, the zero temperature peak value of the dot conductance (i.e. on resonance and symmetric coupling) is e$^2$/2h. In contrast, if the wire is in its trivial phase, the peak is e$^2$/h, or if a regular fermionic zero mode occurs, the conductance is 0. We also consider coupling the dot to both ends of the wire (two MBS), with a magnetic flux f through the loop. The conductance as a function of phase shows peaks at f/f0 = (2n+1)*pi which can be used to tune Flensberg's qubit system [PRL (2011)] to the energy degeneracy point. \\[4pt]  D. E. Liu and H. U. Baranger, PRB in press (2011); arXiv/1107.4338.
*Supported by the U.S. Dept. of Energy (Materials Sciences and Engineering, DE-SC0005237).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.Q29.10
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700