ELFT HÍRADÓ

[Andras Palyi <andraspalyi AT caesar.elte.hu>]

Az ELTE Nanofizika Szeminarium jovo hetfoi eloadasa:


Szechenyi Gabor  (ELTE): 
“Double quantum dots in carbon nanotubes"

Idopont: 2014. oktober 27., hetfo, 10:15
Helyszin: ELTE Eszaki Tomb, 5.128-as terem (1117 Budapest, Pazmany Peter 
setany 1/A)

Kivonat:
"Carbon nanotube quantum dots are promising candidates for solid-state 
quantum information processing. The qubit is realized by a single electron in 
the quantum dot, which can occupy an arbitrary superposition of two energy 
eigenstates with antiparallel alignment of spin and valley. Using the 
so-called Pauli blockade mechanism, this spin-valley qubit can be initialized 
and read out via dc current measurement through a double quantum dot. 
Motivated by experiments realizing this idea, we calculate the dependence of 
the dc current through the double quantum dot on the external magnetic field, 
the configuration of short-range impurities, and the geometry of the 
nanotube. Our model establishes the parameter range where the proposed qubit 
readout procedure works. Furthermore, our results provide understanding of 
previously unexplained experimental features, including a narrow 
antiresonance in the current as the magnetic field direction is varied. We 
argue that the antiresonance provides a unique opportunity to detect static 
or time-dependent variations of the nanotube geometry and the magnetic field 
with high sensitivity, via measuring the dc current."


Tovabbi program: http://wigner.elte.hu/science/?q=seminar

Minden erdeklodot szivesen latunk.

Udvozlettel,
Palyi Andras