Zhengyan Shi

All Publications

• Composite Bogoliubov Fermi Liquid in a Half-Filled Chern Band PHYSICAL REVIEW LETTERS Shi, Z., Nosov, P. A. 2026; 137 (6)

  View details for DOI 10.1103/wq3w-cb7f

  View details for Web of Science ID 001847502100003

• Composite Bogoliubov Fermi Liquid in a Half-Filled Chern Band. Physical review letters Shi, Z. D., Nosov, P. A. 2026; 137 (6): 066604

  Abstract

  The composite Fermi liquid in the half-filled Landau level is a cornerstone of the quantum Hall phase diagram. Recent experiments and numerics indicate that an anomalous composite Fermi liquid (ACFL) can also arise at half filling of a Chern band without any external magnetic field, opening new possibilities for paired states of composite fermions beyond the fully gapped Pfaffian phase. We argue that, in inversion-asymmetric Chern bands with lattice rotational symmetry reduced to C_{3}, as realized in experimental platforms where signatures of the ACFL have been observed, composite fermions can form a superconductor with neutral gapless Bogoliubov Fermi surfaces. We term the resulting electronic state the composite Bogoliubov Fermi liquid. This phase has a number of properties that make it distinct from both the ACFL and the fully gapped Pfaffian. For instance, it is incompressible, has quantized Hall conductance, shows no quantum oscillations as a function of magnetic field or doping, and has topological ground state degeneracy on a torus despite the presence of gapless quasiparticles. At the same time, the neutral Bogoliubov Fermi surface yields metallic T-linear specific heat, nonquantized thermal conductance, Landau damping of density fluctuations, and a nonanalytic |q|^{3} contribution to the equal-time structure factor S(q). We also discuss vortices and fractionalized daughter states induced by doping or external magnetic fields. Our results pave the way for a broader understanding of gapless topological phases arising from paired composite fermions in Chern bands beyond the conventional Landau level paradigm.

  View details for DOI 10.1103/wq3w-cb7f

  View details for PubMedID 42628061

• Anyon delocalization transitions out of a disordered fractional quantum anomalous Hall insulator PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Shi, Z., Senthil, T. 2025; 122 (51): e2520608122

  Abstract

  Motivated by the experimental discovery of the fractional quantum anomalous Hall effect, we develop a theory of doping-induced transitions out of the [Formula: see text] lattice Jain state in the presence of quenched disorder. We show that disorder strongly affects the evolution into the conducting phases described in our previous work. The delocalization of charge [Formula: see text] anyons leads to a chiral superconductor through a direct second-order transition for a smooth random potential with long-wavelength modulations. The longitudinal resistance has a universal peak at the associated quantum critical point. Close to the transition, we show that the superconducting ground state is an "Anomalous Vortex Glass" stabilized in the absence of an external magnetic field. For short-wavelength disorder, this transition generically splits into three distinct ones with intermediate insulating topological phases. If instead, the charge [Formula: see text] anyon delocalizes, then at low doping the resulting phase is a Reentrant Integer Quantum Hall state with [Formula: see text]. At higher doping this undergoes a second transition to a Fermi liquid metal. We show that this framework provides a plausible explanation for the complex phase diagram recently observed in twisted MoTe2 near [Formula: see text] and discuss future experiments that can test our theory in more detail.

  View details for DOI 10.1073/pnas.2520608122

  View details for Web of Science ID 001673073700001

  View details for PubMedID 41417607

  View details for PubMedCentralID PMC12745681

• Bidirectional Ultrafast Control of Charge Density Waves via Phase Competition PHYSICAL REVIEW LETTERS Ning, H., Oh, K., Su, Y., Shi, Z., Wu, D., Liu, Q., Lv, B. Q., Zong, A., Kang, G., Choi, H., Kim, H. J., Ha, S., Kim, J., Sarker, S., Ruff, J. P. C., Kim, B. J., Wang, N. L., Senthil, T., Jang, H., Gedik, N. 2025; 135 (24)

  View details for DOI 10.1103/b1vl-qlkk

  View details for Web of Science ID 001644454500001

• Bidirectional Ultrafast Control of Charge Density Waves via Phase Competition. Physical review letters Ning, H., Oh, K. H., Su, Y., Shi, Z. D., Wu, D., Liu, Q., Lv, B. Q., Zong, A., Kang, G., Choi, H., Kim, H. J., Ha, S., Kim, J., Sarker, S., Ruff, J. P., Kim, B. J., Wang, N. L., Senthil, T., Jang, H., Gedik, N. 2025; 135 (24): 246504

  Abstract

  The intricate competition between coexisting charge density waves (CDWs) can lead to rich phenomena, offering unique opportunities for phase manipulation through electromagnetic stimuli. Leveraging time-resolved x-ray diffraction, we demonstrate ultrafast control of a CDW in EuTe_{4} upon optical excitation. At low excitation intensities, the amplitude of one of the coexisting CDW orders increases at the expense of the competing CDW, whereas at high intensities, it exhibits a nonmonotonic temporal evolution characterized by both enhancement and reduction. This transient bidirectional controllability, tunable by adjusting photoexcitation intensity, arises from the interplay between optical quenching and phase-competition-induced enhancement. Our findings, supported by phenomenological time-dependent Ginzburg-Landau theory simulations, not only clarify the relationship between the two CDWs in EuTe_{4}, but also highlight the versatility of optical control over order parameters enabled by phase competition.

  View details for DOI 10.1103/b1vl-qlkk

  View details for PubMedID 41482294

• Doping a Fractional Quantum Anomalous Hall Insulator PHYSICAL REVIEW X Shi, Z., Senthil, T. 2025; 15 (3)

  View details for DOI 10.1103/kcm5-hx56

  View details for Web of Science ID 001590391700002

• Analytic framework for self-dual criticality in<i><i> Z</i>k</i> gauge theory with matter PHYSICAL REVIEW B Shi, Z., Chatterjee, A. 2025; 112 (8)

  View details for DOI 10.1103/9qrw-p5zn

  View details for Web of Science ID 001578735000002

• Local dynamics and the structure of chaotic eigenstates PHYSICAL REVIEW B Shi, Z., Vardhan, S., Liu, H. 2023; 108 (22)

  View details for DOI 10.1103/PhysRevB.108.224305

  View details for Web of Science ID 001141671300004

• Many-body localization transition with correlated disorder PHYSICAL REVIEW B Shi, Z., Khemani, V., Vasseur, R., Gopalakrishnan, S. 2022; 106 (14)

  View details for DOI 10.1103/PhysRevB.106.144201

  View details for Web of Science ID 000876854900003

• Holographic flows from CFT to the Kasner universe JOURNAL OF HIGH ENERGY PHYSICS Frenkel, A., Hartnoll, S. A., Kruthoff, J., Shi, Z. D. 2020

  View details for DOI 10.1007/JHEP08(2020)003

  View details for Web of Science ID 000560390100002

• Topological order in matrix Ising models SCIPOST PHYSICS Hartnoll, S. A., Mazenc, E. A., Shi, Z. D. 2019; 7 (6)

  View details for DOI 10.21468/SciPostPhys.7.6.081

  View details for Web of Science ID 000505803200010