Coulomb-blockade and Pauli-blockade magnetometry

Article

关键词: DOUBLE-QUANTUM DOTS;    SINGLE-ELECTRON TRANSISTOR;    CARBON NANOTUBES;    SKYRMION LATTICE;    FORCE MICROSCOPY;    SPIN BLOCKADE;    RESOLUTION;    SILICON;    QUBIT;    LAALO3/SRTIO3;   

DOI  :  10.1103/PhysRevB.95.035431

来源: SCIE

【 摘 要 】

Scanning-probe magnetometry is a valuable experimental tool to investigatemagnetic phenomena at themicro and nanoscale. We theoretically analyze the possibility of measuring magnetic fields via the electrical current flowing through quantum dots. We characterize the shot-noise-limited magnetic-field sensitivity of two devices: a single dot in the Coulomb blockade regime, and a double dot in the Pauli blockade regime. Constructing such magnetometers using carbon nanotube quantum dots would benefit from the large, strongly anisotropic and controllable g tensors, the low abundance of nuclear spins, and the small detection volume allowing for nanoscale spatial resolution; we estimate that a sensitivity below 1 mu T/root Hz can be achieved with this material. As quantum dots have already proven to be useful as scanning-probe electrometers, our proposal highlights their potential as hybrid sensors having in situ switching capability between electrical and magnetic sensing.

【 授权许可】

Free