Tunable tunnel barriers in a semiconductor via ionization of individual atoms
Tunable tunnel barriers in a semiconductor via ionization of individual atoms
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通过单个原子的电离可调节半导体中的隧道势垒
DOI:
10.1088/1361-648x/abf9bd
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Chowdhury, Enam
中科院分区:
文献类型:
--
作者:
Mueller, Sara M;Kim, Dongjoon;McMillan, Stephen R;Tjung, Steven J;Repicky, Jacob J;Gant, Stephen;Lang, Evan;Bergmann, Fedor;Werner, Kevin;Chowdhury, Enam
We report scanning tunneling microscopy (STM) studies of individual adatoms deposited on an InSb (110) surface. The adatoms can be reproducibly dropped off from the STM tip by voltage pulses, and impact tunneling into the surface by up to∼ 100×. The spatial extent and magnitude of the tunneling effect are widely tunable by imaging conditions such as bias voltage, set current and photoillumination. We attribute the effect to occupation of a (+/0) charge transition level, and switching of the associated adatom-induced band bending. The effect in STM topographic images is well reproduced by transport modeling of filling and emptying rates as a function of the tip position. STM atomic contrast and tunneling spectra are in good agreement with density functional theory calculations for In adatoms. The adatom ionization effect can extend to distances greater than 50 nm away, which we attribute to the low concentration and low binding energy of the residual donors in the undoped InSb crystal. These studies demonstrate how individual atoms can be used to sensitively control current flow in nanoscale devices.
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DOI:
10.1103/physrevb.42.7288
发表时间:
1990
期刊:
Physical review. B, Condensed matter
影响因子:
--
作者:
Whitman;Stroscio;Dragoset;Celotta
通讯作者:
Celotta
DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
J. Stroscio;R. Feenstra
通讯作者:
R. Feenstra
DOI:
--
发表时间:
1969
期刊:
影响因子:
--
作者:
R. Kaplan
通讯作者:
R. Kaplan
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
J. Bocquel;V. Kortan;C. Şahin;R. Campion;B. Gallagher;M. Flatté;P. Koenraad
通讯作者:
P. Koenraad
影响因子:
8.6
作者:
Pradhan, NA;Liu, N;Ho, W
通讯作者:
Ho, W