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Chen J, Han W, Zhang Y, Zhang X, Ge Y, Guo Y, Yang F. Bias-dependent hole transport through a multi-channel silicon nanowire transistor with single-acceptor-induced quantum dots. NANOSCALE 2022; 14:11018-11027. [PMID: 35866357 DOI: 10.1039/d2nr02250h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Quantum transport in multi-channel silicon nanowire transistors presents enhanced data capacity and driving ability by overlapping current, which are essential for constructing quantum logic platforms. However, the overlapping behavior of the quantum transport through multi-channels remains elusive. Herein, we demonstrated bias-dependent hole transport spectroscopy from zero-dimensional (0D) to one-dimensional (1D) features in a lightly boron-doped multi-channel silicon nanowire transistor. The evolution of the initial 0D conductance peak splitting with source/drain bias voltages reveals the statistically distributed positions of single dopant atoms in multi-channels relative to the source or drain side. Two sets of 1D subbands are determined separately for heavy and light holes with different effective masses by measuring the positions of transconductance valleys, which have a negative shift with increasing bias voltage. Our results will benefit the practical utilization of silicon-based devices with atomic-level functionality in the field of quantum computation.
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Affiliation(s)
- Jundong Chen
- Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Weihua Han
- Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yanbo Zhang
- Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Xiaodi Zhang
- Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yandong Ge
- Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yangyan Guo
- Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Fuhua Yang
- Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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Huff TR, Dienel T, Rashidi M, Achal R, Livadaru L, Croshaw J, Wolkow RA. Electrostatic Landscape of a Hydrogen-Terminated Silicon Surface Probed by a Moveable Quantum Dot. ACS NANO 2019; 13:10566-10575. [PMID: 31386340 DOI: 10.1021/acsnano.9b04653] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
With nanoelectronics reaching the limit of atom-sized devices, it has become critical to examine how irregularities in the local environment can affect device functionality. Here, we characterize the influence of charged atomic species on the electrostatic potential of a semiconductor surface at the subnanometer scale. Using noncontact atomic force microscopy, two-dimensional maps of the contact potential difference are used to show the spatially varying electrostatic potential on the (100) surface of hydrogen-terminated highly doped silicon. Three types of charged species, one on the surface and two within the bulk, are examined. An electric field sensitive spectroscopic signature of a single probe atom reports on nearby charged species. The identity of one of the near-surface species has been uncertain in the literature, and we suggest that its character is more consistent with either a negatively charged interstitial hydrogen or a hydrogen vacancy complex.
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Affiliation(s)
- Taleana R Huff
- Department of Physics , University of Alberta , Edmonton , Alberta T6G 2J1 , Canada
- Quantum Silicon, Inc. , Edmonton , Alberta T6G 2M9 , Canada
| | - Thomas Dienel
- Department of Physics , University of Alberta , Edmonton , Alberta T6G 2J1 , Canada
| | - Mohammad Rashidi
- Department of Physics , University of Alberta , Edmonton , Alberta T6G 2J1 , Canada
| | - Roshan Achal
- Department of Physics , University of Alberta , Edmonton , Alberta T6G 2J1 , Canada
- Quantum Silicon, Inc. , Edmonton , Alberta T6G 2M9 , Canada
| | | | - Jeremiah Croshaw
- Department of Physics , University of Alberta , Edmonton , Alberta T6G 2J1 , Canada
| | - Robert A Wolkow
- Department of Physics , University of Alberta , Edmonton , Alberta T6G 2J1 , Canada
- Nanotechnology Research Centre , National Research Council Canada , Edmonton , Alberta T6G 2M9 , Canada
- Quantum Silicon, Inc. , Edmonton , Alberta T6G 2M9 , Canada
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Righetto M, Bolzonello L, Volpato A, Amoruso G, Panniello A, Fanizza E, Striccoli M, Collini E. Deciphering hot- and multi-exciton dynamics in core-shell QDs by 2D electronic spectroscopies. Phys Chem Chem Phys 2018; 20:18176-18183. [PMID: 29961782 PMCID: PMC6044327 DOI: 10.1039/c8cp02574f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
2D electronic spectroscopy maps acquired in different configurations unveil intraband hot carrier cooling and interband multi-exciton recombination dynamics.
Although the harnessing of multiple and hot excitons is a prerequisite for many of the groundbreaking applications of semiconductor quantum dots (QDs), the characterization of their dynamics through conventional spectroscopic techniques is cumbersome. Here, we show how a careful analysis of 2DES maps acquired in different configurations (BOXCARS and pump–probe geometry) allows the tracking and visualization of intraband Auger relaxation mechanisms, driving the hot carrier cooling, and interband bi- and tri-exciton recombination dynamics. The results obtained on archetypal core–shell CdSe/ZnS QDs suggest that, given the global analysis of the resulting datasets, 2D electronic spectroscopy techniques can successfully and efficiently dispel the intertwined dynamics of fast and ultrafast recombination processes in nanomaterials. Hence, we propose this analysis scheme to be used in future research on novel quantum confined systems.
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Affiliation(s)
- Marcello Righetto
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, I-35131 Padova, Italy.
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Fresch B, Bocquel J, Hiluf D, Rogge S, Levine RD, Remacle F. Implementation of Multivariable Logic Functions in Parallel by Electrically Addressing a Molecule of Three Dopants in Silicon. Chemphyschem 2017; 18:1790-1797. [PMID: 28470997 DOI: 10.1002/cphc.201700222] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 04/14/2017] [Indexed: 12/17/2022]
Abstract
To realize low-power, compact logic circuits, one can explore parallel operation on single nanoscale devices. An added incentive is to use multivalued (as distinct from Boolean) logic. Here, we theoretically demonstrate that the computation of all the possible outputs of a multivariate, multivalued logic function can be implemented in parallel by electrical addressing of a molecule made up of three interacting dopant atoms embedded in Si. The electronic states of the dopant molecule are addressed by pulsing a gate voltage. By simulating the time evolution of the non stationary electronic density built by the gate voltage, we show that one can implement a molecular decision tree that provides in parallel all the outputs for all the inputs of the multivariate, multivalued logic function. The outputs are encoded in the populations and in the bond orders of the dopant molecule, which can be measured using an STM tip. We show that the implementation of the molecular logic tree is equivalent to a spectral function decomposition. The function that is evaluated can be field-programmed by changing the time profile of the pulsed gate voltage.
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Affiliation(s)
- Barbara Fresch
- Theoretical Physical Chemistry, University of Liege, B4000, Liege, Belgium.,Department of Chemical Science, University of Padova, Via Marzolo 1, 35131, Italy
| | - Juanita Bocquel
- Centre for Quantum Computation and Communication Technology, School of Physics, The University of New South Wales, Sydney, New South Wales, 2052, Australia
| | - Dawit Hiluf
- The Fritz Haber Center for Molecular Dynamics and Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.,Current address: Department of Chemistry, Ben Gurion University of the Negev, Be'er-Sheva, 84105, Israel
| | - Sven Rogge
- Centre for Quantum Computation and Communication Technology, School of Physics, The University of New South Wales, Sydney, New South Wales, 2052, Australia
| | - Raphael D Levine
- The Fritz Haber Center for Molecular Dynamics and Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.,Crump Institute for Molecular Imaging and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine and Department of Chemistry and Biochemistry, University of California, Los Angeles, California, 90095, USA
| | - Françoise Remacle
- Theoretical Physical Chemistry, University of Liege, B4000, Liege, Belgium.,The Fritz Haber Center for Molecular Dynamics and Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
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