PHYSICS/토토 분석 SEMINAR[03.18]

“Non-demolition 토토 분석 State Detection with mesoscopic interferometers ”

* Speaker : Dr. Sam Young Cho

(Centre for Modern Physics and Department of Physics, Chongqing University, Chongqing, China )

* Place : Physics Seminar Room (Science Bldg, 3-201)

* Date & Time : Mar, 18 (Thu) 4:00 ~ 5:00 pm

Ø Abstract

Recent advances in nanotechnology have made it possible to transport electron 토토 분석s coherently

over hundreds of micrometers at low temperature. Controllable 토토 분석-orbit interactions in the nanoscale

quantum devices have provided an electrical way of manipulating ballistic electron 토토 분석s without magnetic

fields and magnets. Such a manipulation of the 토토 분석 degree of freedom of electrons without destroying

their phase coherence may also allow us a possible way to detect 토토 분석 state of electron.

In this talk, a theoretical model will be discussed by introducing a mesoscopic scale 토토 분석ic interferometer

with local 토토 분석-orbit interactions. Passing through the loop interferometer, an injected electron can induce

a charge loop current due to the 토토 분석-dependent quantum interference via the local 토토 분석-orbit interaction

in one of the interferometer arms even for 토토 분석-unpolarized injections. The loop current is shown to depend

on the 토토 분석 state of injected electron as well as its 토토 분석 polarization. Further, it is found that the transmitted

electron has the same 토토 분석 state with the injected electron. As a consequence, it is shown that a 토토 분석 state

of injected electron can be determined from the behavior of loop currents as the Rashba 토토 분석-orbit

interaction varies.

Contact Person : Prof. Yoon Hee Jeong (054-279-2078, yhj@postech.ac.kr)