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3. Evidence of itinerant holes for long-range magnetic order in tungsten diselenide semiconductor with vanadium dopants

Author

Song, Bumsub, Yun, Seok Joon, Jiang, Jinbao, Beach, Kory, Choi, Wooseon, Kim, Young-Min, Terrones, Humberto, Song, Young Jae, Duong, Dinh Loc, and Lee, Young Hee

Subjects
Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

One primary concern in diluted magnetic semiconductors (DMSs) is how to establish a long-range magnetic order with a low magnetic doping concentration to maintain the gate tunability of the host semiconductor, as well as to increase Curie temperature. Two-dimensional van der Waals semiconductors have been recently investigated to demonstrate the magnetic order in DMSs; however, a comprehensive understanding of the mechanism responsible for the gate-tunable long-range magnetic order in DMSs has not been achieved yet. Here, we introduce a monolayer tungsten diselenide (WSe2) semiconductor with V dopants to demonstrate the long-range magnetic order through itinerant spin-polarized holes. The V atoms are sparsely located in the host lattice by substituting W atoms, which is confirmed by scanning tunneling microscopy and high-resolution transmission electron microscopy. The V impurity states and the valence band edge states are overlapped, which is congruent with density functional theory calculations. The field-effect transistor characteristics reveal the itinerant holes within the hybridized band; this clearly resembles the Zener model. Our study gives an insight into the mechanism of the long-range magnetic order in V-doped WSe2, which can also be used for other magnetically doped semiconducting transition metal dichalcogenides., Comment: 19 pages, 4 figures

Published
2020
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6. Stability-limiting heterointerfaces of perovskite photovoltaics

Author

Tan, Shaun, Huang, Tianyi, Yavuz, Ilhan, Wang, Rui, Yoon, Tae Woong, Xu, Mingjie, Xing, Qiyu, Park, Keonwoo, Lee, Do-Kyoung, Chen, Chung-Hao, Zheng, Ran, Yoon, Taegeun, Zhao, Yepin, Wang, Hao-Cheng, Meng, Dong, Xue, Jingjing, Song, Young Jae, Pan, Xiaoqing, Park, Nam-Gyu, Lee, Jin-Wook, and Yang, Yang

Published
2022
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10. Probing Inherent Optical Anisotropy in Substrates via Direct Nanoimaging of Mie Scattering

Author

Woo, Hwi Je, primary, Han, Jaewon, additional, Ji, Sangmin, additional, Shin, Bong Gyu, additional, Park, Seong Hun, additional, Lee, Sung-Gyu, additional, Lee, Chang-Won, additional, Hwang, Euyheon, additional, Kim, Deok-Soo, additional, Choi, Soobong, additional, Jeong, Mun Seok, additional, Yi, Gi-Ra, additional, Kim, Junki, additional, and Song, Young Jae, additional

Published
2024
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21. Landau Levels and Band Bending in Few-Layer Epitaxial Graphene

Author

Min, Hongki, Adam, S., Song, Young Jae, Stroscio, Joseph A., Stiles, M. D., and MacDonald, A. H.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

The carrier density distributions in few-layer-graphene systems grown on the carbon face of silicon carbide can be altered by the presence of a scanning tunneling microscope (STM) tip used to probe top-layer electronic properties, and by a perpendicular magnetic field which induces well-defined Landau levels. Hartree approximation calculations in the perpendicular field case show that charge tends to rearrange between the layers so that the filling factors of most layers are pinned at integer values. We use our analysis to provide insight into the role of buried layers in recent few-layer-graphene STM studies and discuss the limitations of our model., Comment: 7 pages, 10 figures

Published
2011
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22. Intrusion-aware Alert Validation Algorithm for Cooperative Distributed Intrusion Detection Schemes of Wireless Sensor Networks

Author

Shaikh, Riaz Ahmed, Jameel, Hassan, Auriol, Brian J. d, Lee, Heejo, Lee, Sungyoung, and Song, Young-Jae

Subjects
Computer Science - Cryptography and Security
Abstract

Existing anomaly and intrusion detection schemes of wireless sensor networks have mainly focused on the detection of intrusions. Once the intrusion is detected, an alerts or claims will be generated. However, any unidentified malicious nodes in the network could send faulty anomaly and intrusion claims about the legitimate nodes to the other nodes. Verifying the validity of such claims is a critical and challenging issue that is not considered in the existing cooperative-based distributed anomaly and intrusion detection schemes of wireless sensor networks. In this paper, we propose a validation algorithm that addresses this problem. This algorithm utilizes the concept of intrusion-aware reliability that helps to provide adequate reliability at a modest communication cost. In this paper, we also provide a security resiliency analysis of the proposed intrusion-aware alert validation algorithm., Comment: 19 pages, 7 figures

Published
2009
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30. Standing wave patterns in graphene systems studied using scanning tunneling spectroscopy.

Author

Jang, Won-Jun, Chang, Min Hui, Kang, Min Jeong, Song, Young Jae, and Kahng, Se-Jong

Subjects
TUNNELING spectroscopy, STANDING waves, SCANNING tunneling microscopy, GRAPHENE, CHEMICAL vapor deposition, POTENTIAL barrier
Abstract

Standing wave patterns are formed near potential barriers or steps due to the interference of incident and reflected waves. Graphene systems show standing wave patterns near atomic step edges, defects, and impurities in scanning tunneling microscopy; however, there are still unexplored examples. In this study, we present our experimental results for graphene directly grown on hexagonal-BN/Cu by chemical vapor deposition. Standing wave patterns were observed in our scanning tunneling microscopy and spectroscopy, revealing linear dispersion relations with a Fermi velocity of about 106 m/s. Our study shows that graphene grown on hexagonal-BN/Cu provides a useful platform to study the electronic characteristics of graphene systems. [ABSTRACT FROM AUTHOR]

Published
2023
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34. Selective Mapping of Tip-Launched Near-Field Scattering of Surface Plasmon Polaritons for Retrieving Dispersion Relation in Silver Nanoflakes

Author

Woo, Hwi Je, primary, Ji, Sangmin, additional, Han, Jaewon, additional, Woo, Seongwon, additional, Kim, Hyuntae, additional, Kim, Seonyeong, additional, Lee, Chang-Won, additional, Choi, Soobong, additional, Kim, Deok-Soo, additional, Jeong, Mun Seok, additional, Hwang, Euyheon, additional, Lim, Byungkwon, additional, and Song, Young Jae, additional

Published
2023
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46. A QoS Oriented Broker System for Autonomic Web Services Selection

Author

Seo, Young-Jun, Song, Young-Jae, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Min, Geyong, editor, Di Martino, Beniamino, editor, Yang, Laurence T., editor, Guo, Minyi, editor, and Rünger, Gudula, editor

Published
2006
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47. LSec: Lightweight Security Protocol for Distributed Wireless Sensor Network

Author

Shaikh, Riaz Ahmed, Lee, Sungyoung, Khan, Mohammad A. U., Song, Young Jae, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Cuenca, Pedro, editor, and Orozco-Barbosa, Luiz, editor

Published
2006
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48. Components Searching System Using Component Identifiers and Request Specifics

Author

Park, Jea-Youn, Kim, Gui-Jung, Song, Young-Jae, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Gavrilova, Marina L., editor, Gervasi, Osvaldo, editor, Kumar, Vipin, editor, Tan, C. J. Kenneth, editor, Taniar, David, editor, Laganá, Antonio, editor, Mun, Youngsong, editor, and Choo, Hyunseung, editor

Published
2006
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49. A Study on Automatic Code Generation Tool from Design Patterns Based on the XMI

Author

Seo, Young-Jun, Song, Young-Jae, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Gavrilova, Marina L., editor, Gervasi, Osvaldo, editor, Kumar, Vipin, editor, Tan, C. J. Kenneth, editor, Taniar, David, editor, Laganá, Antonio, editor, Mun, Youngsong, editor, and Choo, Hyunseung, editor

Published
2006
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50. Best Web Service Selection Based on the Decision Making Between QoS Criteria of Service

Author

Seo, Young-Jun, Jeong, Hwa-Young, Song, Young-Jae, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Yang, Laurence T., editor, Zhou, Xingshe, editor, Zhao, Wei, editor, Wu, Zhaohui, editor, Zhu, Yian, editor, and Lin, Man, editor

Published
2005
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