Search results

Sort By:

Limit search:

Singlet-Triplet Switching Induced by Electric Field in Triple Quantum Dots

100%

Łuczak J., Bułka B.

Acta Physica Polonica A

2012

vol. 121

issue 5-6

1195-1197

We analyze influence of an external electric field on magnetic properties of a triple quantum dot system in a triangular and linear geometry. The system contains four electrons and is described by an extended Hubbard model which includes electron correlations and exchange processes. The electric field leads to splitting of energy levels (the Stark effect) and to transition between the singlet and triplet states.

Dynamics of a Charge Qubit Encoded in a Double Quantum Dot

100%

Łuczak J., Bułka B.

Acta Physica Polonica A

2018

vol. 133

issue 3

748-750

We study the short time dynamics of a charge qubit encoded in two coherently coupled quantum dots connected to external electrodes. In the regime of sequential tunneling the waiting time distribution is used to investigate in details statistics of the tunneling events and their correlations. We show that the coherent rotation of the qubit state on the Bloch sphere can be seen in tunneling events when an electron is injected and leave the system. Decoherence, relaxation of the qubit state as well as leakage processes are studied by means of transient currents.

Refine search results

2 Acta Physica Polonica A

1 2018

1 2012

2 Bułka B.

2 Łuczak J.

Search results

Singlet-Triplet Switching Induced by Electric Field in Triple Quantum Dots

Dynamics of a Charge Qubit Encoded in a Double Quantum Dot