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Dr. Yang Liu 刘阳

Assistant Professor

 

Contact Info

Office：Rm 544, 209 Chengfu Road, Haidian District, Beijing, 100871

Tel：17812704898

Email：liuyang02@pku.edu.cn

Personal Homepage：http://catslabicqm.com

Resume

 

Education

Degree

Year

Major     

Institution

Ph.D.

2008-2014

Electric Engineering

Princeton University

M.S.

2006-2008

Electronics Engineering

Tsinghua University

B.S.

2002-2006

Electronics Engineering

Tsinghua University

 

Professional Appointments

Year

Position

Institution

2015-2018

Postdoctoral Fellow

Stanford University

2014-2015

Postdoctoral Fellow

Princeton University

 

Research Interests

Ultra-clean two-dimensional (2D) carrier systems in Modulation-doped GaAs/AlGaAs hetero-structures provide a nearly ideal testing ground for exploring quantum transport and other interaction-induced physics phenomena. This is indeed the cleanest system yet available where the electrons can travel coherently for as long as ~10 μm. At low temperatures and in the presence of a strong magnetic field, these systems exhibit fascinating, often unexpected, many-body states arising from the strong electron-electron interaction. Examples include the fractional quantum Hall liquid, the Wigner solid, and the newly discovered striped (nematic) and bubble phases in the higher Landau levels.

The rapid improvement of quantum computing technique and fast scaling of qubits put great demands on cryogenic electronic circuits operating at millikelvin temperatures. The high electron mobility transistors (HEMTs) based on high quality modulation-doped 2DES/2DHS, are the best candidates. They can be integrated with quantum devices such as qubits, SQUIDs, single-electron transistors, etc., work natively at T ≤ 4 K, have high cut-off frequency, and dissipate only a few μW of power. Moreover, the study of high mobility 2D systems reveals a rich family of quantum phenomenon and transitions such as quantum Hall effect, Wigner crystal, etc., which can be applied in developing new HEMTs.

Read the more detailed research plan.

 

Selected Publications (Publications 2024):
  1. Wenxuan Wang, Gengdong Zhou, Wenlu Lin, Zuo Feng, Miao Liang, Zaizhe Zhang, Min Wu, Le Liu, Kenji Watanabe, Takashi Taniguchi, Wei Yang, Guangyu Zhang, Kaihui Liu, Jinhua Gao, Yang Liu*, Xincheng Xie, Zhida Song* and Xiaobo Lu*, “Correlated Charge Density Wave Insulators in Chirally Twisted Triple Bilayer Graphene”, accepted by Phys. Rev. Lett.
  2. Mengmeng Wu, Xiao Liu, Renfei Wang, Xi Lin*, and Yang Liu*, "A high-speed, high-resolution thermometer using surface acoustic wave delay-line", Rev. Sci. Instrum. 95, 054903 (2024).
  3. Xin Qin, Xingyu Wang, Wenshan Hong, Yuan Li, Huiqian Luo, Shiliang Li*, and Yang Liu*, “Electronic Phase Propagation Speed in BaFe2As2 Revealed by Dilatometry”, Phys. Rev. Applied 21, L041003 (2024).
  4. Xin Qin, Guoxin Cao, Xingyu Wang, Wenshan Hong, Yuan Li, Huiqian Luo, Shiliang Li, and Yang Liu*, “An ultra-high-resolution AC dilatometry using fiber-interferometer”, accepted by Rev. Sci. Instrum. 95 053905 (2024).
  5. Daiqiang Huang, Yang Wang, He Wang*, Jian Wang and Yang Liu*, “Magneto-optic Kerr Effect Measurement of TbMn6Sn6 at mK-Temperature”, Chinese Physics Letters 41, 047801 (2024).
  6. Xiao Liu, Mengmeng Wu, Renfei Wang, Xinghao Wang, Wenfeng Zhang,  Yujiang Dong, Rui-Rui Du,  Yang Liu* and Xi Lin*, “The Interaction between Surface Acoustic Wave and Quantum Hall Effects”, Chinese Physics Letters 41, 047301 (2024).
  7. Mengmeng Wu, Xiao Liu, Renfei Wang, Yoon Jang Chung, Adbhut Gupta, K. W. Baldwin, L. N. Pfeiffer, Xi Lin*, Yang Liu*, “Morphing of Quantum Phases When Hosting Current”, Phy. Rev. Lett., 132, 076501 (2024).
  8. Shuai Yuan, Jiaojie Yan, Ke Huang, Zhimou Chen, Haoran Fan, L. N. Pfeiffer, K. W. West, Yang Liu*, Xi Lin*, “Pseudospin Polarization of Composite Fermions under Uniaxial Strain”, Phys. Rev. B 109, L081110 (2024).
  9. Wenlu Lin, Xing Fan, Lili Zhao, Yoon Jang Chung, Adbhut Gupta, K. W. Baldwin, L. N. Pfeiffer, Hong Lu, Yang Liu*, "Metastable Charge Distribution Between Degenerate Landau Levels", Phy. Rev. B 109, 035305 (2024).
  10. Lili Zhao, Wenlu Lin, Y. J. Chung, Adbhut Gupta, K. W. Baldwin, L. N. Pfeiffer, Yang Liu*, “Dynamic response of Wigner Crystals”, Phys. Rev. Lett. 130, 246401 (2023).
  11. Jiaojie Yan, Yijia Wu, Shuai Yuan, Xiao Liu, L. N. Pfeiffer, K. W. West, Yang Liu, Hailong Fu, X. C. Xie, Xi Lin*, “Anomalous quantized plateaus in two-dimensional electron gas with gate confinement”, Nature Communications 14, 1758 (2023).
  12. Huimin Sun, Yizhou Liu, Daiqiang Huang, Yu Fu, Yu Huang, Mengyun He, Xuming Luo, Wenjie Song, Yang Liu*, Guoqiang Yu, Qing Lin He*, “Nonvolatile zero-field magnetization switching in a single-layer magnetic topological insulator”, Communication Physics 6, 222 (2023).
  13. Lili Zhao, Wenlu Lin, Xing Fan, Yuanjun Song, Hong Lu*, Yang Liu*, “High Precision, Low Excitation Capactiance Measurement Methods from 10 mK- to Room-Temperature”, Review of Scientific Instruments 93, 053910 (2022).
  14. Lili Zhao, Wenlu Lin, Y. J. Chung, K. W. Baldwin, L. N. Pfeiffer, Yang Liu*, “Finite Capacitive Response at the Quantum Hall Plateau”, Chinese Physics Letters 39, 097301 (2022).
  15. Yoon Jang Chung, S. Yuan, Yang Liu, K. W. Baldwin, K. W. West, M. Shayegan, L. N. Pfeiffer*, “Heterostructure design for high-quality, high-density, GaAs two-dimensional electron system with g-factor tending to zero”, Appl. Phys. Lett. 117, 022102 (2020).
  16. Ke Huang, Pengjie Wang, L. N. Pfeiffer, K. W. West, K. W. Baldwin, Yang Liu*, and Xi Lin*, “Resymmetrizing Broken Symmetry with Hydraulic Pressure”, Phys. Rev. Lett. 123, 206602 (2019).