Research

 

Ultra-sensitive Optical Magnetometry and Magnetic Imaging

Our lab specializes in ultra-sensitive magneto-optical measurement and imaging using a unique instrument called loopless fiber-optical Sagnac interferometer microscope, which is developed from a loopless Sagnac interferometer technology that the PI co-invented during Ph.D. a decade ago (Physics Today "Search & discovery: Superconductor forms domains that break time-reversal symmetry", 2006). This is by far the most sensitive magneto-optical Kerr microscope in the world, and we use this unique instrument to study a wide range of materials from unconventional superconductors to vdW atomic layers to magnetic nano-structures. We have for the first time realized magnetic order in van der Waals atomic layers (Physics Today “Search and Discovery: Ferromagnetism found in two-dimensional materials”, Nature "Magnetism in flatland", 2017) that would open the door for atomic-sized spintronic devices. We are also pursuing ultra-sensitive medical magnetic imaging, which is on its way to achieving magnetic field sensitivity comparable to SQUID magnetometer. One of the major motivation is for room temperature functional brain imaging.


Selected publications:


  1. 1.S. Thomas, B. Kuiper, J. Hu, J. Smit, Z. Liao, Z. Zhong, G. Rijnders, A. Vailionis, R. Wu, G. Koster, J. Xia ,“Localized Control of Curie Temperature in Perovskite Oxide Film by Capping-layer-induced Octahedral Distortion”, Phys. Rev. Lett. , 119, 177203 (2017).

  2. 2.Cheng Gong^, Lin Li^, Zhenglu Li^, Huiwen Ji, Alex Stern, Yang Xia, Ting Cao, Wei Bao, Chenzhe Wang, Yuan Wang, Z. Q. Qiu, R. J. Cava, Steven G. Louie*, Jing Xia*, Xiang Zhang*,“Discovery of intrinsic ferromagnetism in 2D van der Waals crystals”, Nature, 546, 265-269 (2017).

  3. 3.Xinxin Gong, Mehdi Kargarian, Alex Stern, Di Yue, Hexin Zhou, Xiaofeng Jin, Victor M. Galitski, Victor M. Yakovenko and Jing Xia, “Time-Reversal-Symmetry-Breaking Superconductivity in Epitaxial Bismuth/Nickel Bilayers”, Science Advances, 3, 3, e1602579 (2017).

  4. 4.Jing Xia, E. Schemm, G. Deutscher, S.A. Kivelson, D. A. Bonn, W. N. Hardy, R. Liang, W. Siemons, G. Koster, M. M. Fejer, and A. Kapitulnik, "Polar Kerr Effect Measurements of YBa2Cu3O6+x: Evidence for Broken Symmetry Near the Pseudogap Temperature", Phys. Rev. Lett. 100, 127002 (2008).

  5. 5.Jing Xia, Maeno Yoshiteru, Peter T. Beyersdorf, M. M. Fejer, and Aharon Kapitulnik, "High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State", Phys. Rev. Lett. 97, 167002 (2006).

  6. 6.Jing Xia, Peter T. Beyersdorf, Martin M. Fejer, and Aharon Kapitulnik, "Modified Sagnac interferometer for high-sensitivity magneto-optic measurements at cryogenic temperatures", Appl. Phys. Lett. 89, 062508 (2006).

Topological Materials for Quantum Computers

We also specialize in sensitive electrical, thermal and mechanical measurements often at low temperature (mK) and high magnetic field (12 T). We are interested in the fabrication and investigation of quantum materials for constructing quantum computers and other novel electronic devices. These materials include topological insulators, atomic-thin oxide heterostructure, unconventional superconductors and v = 5/2 fractional quantum Hall state. In the past few years, our group has pioneered the study of topological Kondo insulator SmB6 (Nature “Hopes surface for exotic insulator”, 2012), and we have made perhaps one of the first working electronics devices based on SmB6: a micro RF oscillator device. Recently we have discovered the chiral edge state of Majorana fermions in a quantum anomalous Hall insulator- superconductor structure” (Science "A twist on the Majorana fermion", 2017) that could play an important role in making robust topologically protected quantum computers.


Selected publications:


  1. 1.Qing Lin He^, Lei Pan^, Alexander L. Stern, Edward Burks, Xiaoyu Che, Gen Yin, Jing Wang, Biao Lian, Quan Zhou, Eun Sang Choi, Koichi Murata, Xufeng Kou, Tianxiao Nie, Qiming Shao, Yabin Fan, Shou-Cheng Zhang, Kai Liu, Jing Xia, Kang L. Wang, (^ Co-first Authors) Chiral Majorana fermion modes in a quantum anomalous Hall insulator–superconductor structure, Science, 357(6348), 294–299 (2017).

  2. 2.A. Stern, M. Dzero, V. M. Galitski, Z. Fisk, J. Xia, “Surface-dominated conduction up to 240 K in the Kondo insulator SmB6 under strain”, Nature Materials, 16, 708-711 (2017).

  3. 3.Xinxin Gong, Mehdi Kargarian, Alex Stern, Di Yue, Hexin Zhou, Xiaofeng Jin, Victor M. Galitski, Victor M. Yakovenko and Jing Xia, “Time-Reversal-Symmetry-Breaking Superconductivity in Epitaxial Bismuth/Nickel Bilayers”, Supplementary_Information.pdf. Science Advances, 3, 3, e1602579 (2017).

  4. 4.A. Stern^, D.K. Efimkin^, V. Galitski, Z. Fisk and J. Xia, “Radio Frequency Tunable Oscillator Device Based on SmB6 Micro-crystal”, (^ Co-first Authors)  Phys. Rev. Lett. 116(16), 166603, (2016).

  5. 5.Maxim Dzero, Jing Xia, Victor Galitski, Piers Coleman, “Topological Kondo Insulators”, Annual Review of Condensed Matter Physics, Volume 7 (2016).

  6. 6.D.J. Kim, J Xia, Z. Fisk, “Topological surface state in the Kondo Insulator Samarium Hexaboride”, Nature Materials, 13, 446-470 (2014).

  7. 7.D.J. Kim^, S. Thomas^, T. Grant, J. Botimer, Z. Fisk, Jing Xia, “Robust Surface Hall Effect and Nonlocal Transport in SmB6: Indication for an Ideal Topological Insulator”, (^ Co-first Authors) Nature: Scientific Reports 3, 3150, (2013).

  8. 8.Jing Xia, J.P. Eisenstein, L.N. Pfeiffer, K.W. West, "Experimental Evidence for a Fractionally Quantized Hall State with Anisotropic Longitudinal Transport”, Nature Physics, 7(11), 845-848, (2011).

  9. 9.Jing Xia, Vaclav Cvicek, J.P. Eisenstein, L.N. Pfeiffer, K.W. West, "Tilt-Induced Anisotropic to Isotropic Phase Transition at v = 5/2", Phys. Rev. Lett. 105, 176807 (2010).

  10. 10.Jing Xia, Maeno Yoshiteru, Peter T. Beyersdorf, M. M. Fejer, and Aharon Kapitulnik, "High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State", Phys. Rev. Lett. 97, 167002 (2006).