کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1546723 | 997622 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigations of the non-linear transient response of quantum point contacts using pulsed excitation with sub-nanosecond time resolution
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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![عکس صفحه اول مقاله: Investigations of the non-linear transient response of quantum point contacts using pulsed excitation with sub-nanosecond time resolution Investigations of the non-linear transient response of quantum point contacts using pulsed excitation with sub-nanosecond time resolution](/preview/png/1546723.png)
چکیده انگلیسی
We review recent work where we have investigated the non-linear transient response of quantum point contacts (QPCs) using pulsed excitation with sub-nanosecond time resolution. The transient response of these devices is shown to be dominated by a large parallel capacitance that is independent of the QPC conductance and pulse amplitude. These characteristics lead us to suggest that the capacitance is associated with charging of the two-dimensional reservoirs that source and sink current to the QPC. Our investigations also show that the transient conductance of the QPC must develop very quickly as the voltage pulse is applied, at least on a time scale shorter than the fastest rise time (2Â ns) used in the experiments. We also find the existence of a characteristic fixed point in the non-linear conductance, at which its value is bias independent. The fixed point appears to correspond to the situation where the unbiased QPC is almost depopulated and can be accounted for by considering the unidirectional population of QPC subbands by the voltage bias. To discuss the behavior of the transient conductance away from the fixed point, we find that it should be necessary to consider the influence of the applied bias on the QPC profile and electron-phonon scattering.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 40, Issue 1, October 2007, Pages 84-91
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 40, Issue 1, October 2007, Pages 84-91
نویسندگان
B. Naser, D.K. Ferry, J. Heeren, J.L. Reno, J.P. Bird,