منابع مشابه
Imaging in Quantum Point Contacts
Alessandro Cresti , Giuseppe Grosso (2) and Giuseppe Pastori Parravicini (3) (1) NEST-INFM, Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy, and Dipartimento di Fisica E. Fermi, Largo B. Pontecorvo 3, I-56127 Pisa, Italy [email protected] (2) NEST-INFM and Dipartimento di Fisica E. Fermi, Largo B. Pontecorvo 3, I-56127 Pisa, Italy (3) NEST-INFM and Dipartimento di Fisica ...
متن کاملLaterally defined freely suspended quantum dots in GaAs/AlGaAs heterostructures.
Free-standing beams containing a two-dimensional electron system are shaped from a GaAs/AlGaAs heterostructure. Quantum point contacts and (double) quantum dots are laterally defined using metal top gates. We investigate the electronic properties of these nanostructures by transport spectroscopy. Tunable localized electron states in freely suspended nanostructures are a promising tool to invest...
متن کاملGraphene based superconducting quantum point contacts
We investigate the Josephson effect in the graphene nanoribbons of length L smaller than the superconducting coherence length and an arbitrary width W . We find that in contrast to an ordinary superconducting quantum point contact (SQPC) the critical supercurrent Ic is not quantized for the nanoribbons with smooth and armchair edges. For a low concentration of the carriers Ic decreases monotoni...
متن کاملAdiabatic dynamics of superconducting quantum point contacts.
Starting from the quasiclassical equations for non-equilibrium Green's functions we derive a simple kinetic equation that governs ac Josephson effect in a superconducting quantum point contact at small bias voltages. In contrast to existing approaches the kinetic equation is valid for voltages with arbitrary time dependence. We use this equation to calculate frequency-dependent linear conductan...
متن کاملConduction channels of superconducting quantum point contacts
Atomic quantum point contacts accommodate a small number of conduction channels. Their number N and transmission coe$cients M1 n N can be determined by analyzing the subgap structure due to multiple Andreev re#ections in the current}voltage (I}<) characteristics in the superconducting state. With the help of mechanically controllable break-junctions we have produced Al contacts consisting of a ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Solid State Communications
سال: 2010
ISSN: 0038-1098
DOI: 10.1016/j.ssc.2010.02.005