188,453 research outputs found
Observation of one electron charge in an enhancement-mode InAs single electron transistor at 4.2K
We propose and demonstrate experimentally a novel design of single-electron
quantum dots. The structure consists of a narrow band gap quantum well that can
undergo a transition from the hole accumulation regime to the electron
inversion regime in a single-top-gate transistor configuration. We have
observed large size quantization and Coulomb charging energies over 10meV. This
quantum dot design can be especially important for scalable quantum computing.Comment: 5 figure
Quantum steering of electron wave function in an InAs Y-branch switch
We report experiments on gated Y-branch switches made from InAs ballistic
electron wave guides. We demonstrate that gating modifies the electron wave
functions as well as their interference pattern, causing the anti-correlated,
oscillatory transconductances. Such previously unexpected phenomenon provides
evidence of steering the electron wave function in a multi-channel transistor
structure.Comment: 15 pages, including 3 figure
Supersymmetry and Goldstino-like Mode in Bose-Fermi Mixtures
Supersymmetry is assumed to be a basic symmetry of the world in many high
energy theories, but none of the super partners of any known elementary
particle has been observed yet. We argue that supersymmetry can also be
realized and studied in ultracold atomic systems with a mixture of bosons and
fermions, with properly tuned interactions and single particle dispersion. We
further show that in such non-releativistic systems supersymmetry is either
spontaneously broken, or explicitly broken by a chemical potential difference
between the bosons and fermions. In both cases the system supports a sharp
fermionic collective mode or the so-called Goldstino, due to supersymmetry. We
also discuss possible ways to detect the Goldstino mode experimentally.Comment: 4 pages. V4: published versio
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