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Associate Professor
Chen,Jeng-Chung

¡@
Office¡G886-3-5742513 (PHYS R106)
Fax¡G886-3-5723052
E-mail¡Gjcchen@phys.nthu.edu.tw

Education
  1. PhD, Purdue University, West Lafayette, (2003)
Professional Experience
Current position¡G
  1. 2010/8-present, Associate Professor of Physics, National Tsing Hua University
Experience¡G
  1. 2006/8-2010/7, Assistant Professor of Physics, National Tsing Hua University
  2. Prof. Komiyama¡¦s lab. Department of basic Science. Tokyo University, Postdoc
    JST Researcher (2004/01-2006/08)
Research Fields
    1. Low-dimensional Physics
    2. Semiconductor / Superconductor Physics
    3. THz/FIR photonics
Research Interests and achievement
Updated on September 3, 2006

Despite of the interest in general area of experimental condensed matter physics, my research has been mainly devoted to the development of nano-devices and the study of quantum electronics last few years. Within quantum electronics part I studied the spin entanglement signal in a double quantum dot (DQD) system by manipulating the inter-dot coupling strength. Within the nano-device part I focus on the implementing photon detector in THz / MIR range with sensitivity up to single photon level.

After joining NTHU in 2006, my research interests switch to the studying of quantum interference phenomena of the low-dimensional electron system at low temperature. Quantum interference signal is constructed by ring like interfering paths of two-dimensional electron (2DEG) gas in ballistic regime and detected in the conductance by measuring Aharonov-Bohm (AB) oscillations. The AB interference signal provides us a tool to exploit the decoherence mechanism and the tunability of the interference pattern by the presence of nano-structure. These experiments are proposed to give the key information of the robustness of the coherence in quantum state and the possibility to built quantum interference device. For practical application, we will utilize the electron phase in AB effect and plasma oscillation in a QD embedded in the annulus of the ring to develop an extremely sensitive submillimeter photon detector operated at 0.3K.


Selected Publications
  1.  "Correlation of anomalous Hall resistivity, magnetoresistance and magnetization in thin films of La2/3Sr1/3MnO3 ", J.C. Chen, S.C. Law, L.C. Tung, C.C. Chi and Weiyan Guan, Phys. Rev. B, 60, 12143 (1999).
  2. "Transition between Quantum States in a Parallel-Coupled Double-Quantum-Dot " , J.C. Chen, A.M. Chang, and M.R. Melloch, Phys. Rev. Lett, 92, 176801 (2004)
  3. "Infrared phototransistor using capacitively coupled two-dimensional electron gas layers", Zhenghua An, J.C. Chen, T. Ueda, S. Komiyama and K. Hirakawa, Appl. Phys. Lett, 86, 172106 (2005)
  4. "Meta-stable excited states of a closed quantum dot probed by Aluminum single electron transistor", J.C. Chen, Zhenghua An, T.Ueda, S.Komiyama, K.Hirakawa, V. Antonov, Phys. Rev. B, 74, 045321 (2006)
  5. "Effects of impurity scattering on the quantized conductance of a quasi-one dimensional quantum wire", J. C. Chen, Yiping Lin, Kuan-Ting Lin, T. Ueda, S. Komiyama. Appl. Phys. Lett, 94, 012105 (2009)
  6. "Negative differential conductivity of two-dimensional electron gas systems in high magnetic fields ², J. C. Chen, Yuling Tsai, Yiping Lin, T. Ueda, S. Komiyama, Phys. Rev. B, 79, 075308(2009).
  7. "Transport properties of a quantum dot in Quantum Hall regimes probed by a single-electron transistor", J. C. Chen, Ming-Yang Li, T. Ueda, S. Komiyama. Appl. Phys. Lett, 94, 232109 (2009)
  8. "The Kondo Effect in coupled-quantum dots ", A. M. Chang, J. C. Chen, Rep. Prog. Phys, 72, 096501 (2009)
  9. "Temperature- and current-dependent dephasing in an Aharonov-Bohm ring¡¨, Kuan-Ting Lin, Yiping Lin, C. C. Chi, J. C. Chen, T. Ueda, S. Komiyama, Phys. Rev. B, 81, 035312 (2010).
  10. "Observation of resonance conductance in a quantum point contact with a tunable channel potential ", Chong-Shian Wen, J. H. Hsiao, Kuan-Ting Lin, Tzay-Ming Hong, and J. C. Chen, T. Ueda, S. Komiyama, Phys. Rev. B, 82, 115416 (2010).
  11. "Characteristics of a sensitive micro-Hall probe fabricated on chemical vapor deposited graphene over the temperature range from liquid-helium to room temperature", Chiu-Chun Tang, Ming-Yang Li, L. J. Li, C. C. Chi, and J. C. Chen. Appl. Phys. Lett, 99, 112107 (2011)
  12. ¡§Asymmetric transmission-induced probe-configuration-dependent dephasing in an Aharonov-Bohm ring ², Kuan-Ting Lin, Yiping Lin, C. C. Chi, and J. C. Chen, Phys. Rev. B, 84, 235404 (2011).

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