Spin Blockade and Exchange in Coulomb-confined Silicon Double Quantum Dots

Overview

Journal Nat Nanotechnol

Specialty Biotechnology

Date 2014 Apr 15

PMID 24727686

Citations 20

Authors

Bent Weber

Y H Matthias Tan

Suddhasatta Mahapatra

Thomas F Watson

Hoon Ryu

Rajib Rahman

Lloyd C L Hollenberg

Gerhard Klimeck

Michelle Y Simmons

Affiliations

Soon will be listed here.

Abstract

Electron spins confined to phosphorus donors in silicon are promising candidates as qubits because of their long coherence times, exceeding seconds in isotopically purified bulk silicon. With the recent demonstrations of initialization, readout and coherent manipulation of individual donor electron spins, the next challenge towards the realization of a Si:P donor-based quantum computer is the demonstration of exchange coupling in two tunnel-coupled phosphorus donors. Spin-to-charge conversion via Pauli spin blockade, an essential ingredient for reading out individual spin states, is challenging in donor-based systems due to the inherently large donor charging energies (∼45 meV), requiring large electric fields (>1 MV m(-1)) to transfer both electron spins onto the same donor. Here, in a carefully characterized double donor-dot device, we directly observe spin blockade of the first few electrons and measure the effective exchange interaction between electron spins in coupled Coulomb-confined systems.

Citing Articles

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Single-Charge Tunneling in Codoped Silicon Nanodevices.

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Valley interference and spin exchange at the atomic scale in silicon.

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