Faculty Details

Areas of Interest

• Condensed Matter Theory
• Strongly Correlated Systems
• Frustrated Magnetism
• Quantum Spin Liquids
• Pseudo-Fermion Functional Renormalization Group and Variational Monte Carlo methods for spin systems

Current Research

Students

Current PhD Students

• PH18D022    AISHWARYA CHAUHAN
• PH19D011    SOURIN CHATTERJEE
• PH20D010    HARI PRASAAD B J
• PH19D033    SUBHOJIT ROY (Co-Guidance)
• PH21D054    AKSHAY KUMAR
• PH21D850    SASANK BUDARAJU
• PH22D078    HARSH RAJ

Recent Publications

• Classical and quantum phases of the pyrochlore S=1/2 magnet with Heisenberg and Dzyaloshinskii-Moriya interactions. Vincent Noculak, Daniel Lozano-Gómez, Jaan Oitmaa, Rajiv R. P. Singh, Yasir Iqbal, Michel J. P. Gingras, and Johannes Reuther. Phys. Rev. B. 107. 214414.
  DOI: 10.1103/PhysRevB.107.214414. 2023.
• Static and dynamical signatures of Dzyaloshinskii-Moriya interactions in the Heisenberg model on the kagome lattice. Francesco Ferrari, Sen Niu, Juraj Hasik, Yasir Iqbal, Didier Poilblanc, and Federico Becca. SciPost Phys. 14. 139.
  DOI: 10.21468/SciPostPhys.14.6.139. 2023.
• Quantum Effects on Unconventional Pinch Point Singularities. Nils Niggemann, Yasir Iqbal, and Johannes Reuther. Phys. Rev. Lett. 130. 196601.
  DOI: 10.1103/PhysRevLett.130.196601. 2023.
• Projective symmetry group classification of Abrikosov fermion mean-field ansätze on the square-octagon lattice. Atanu Maity, Francesco Ferrari, Ronny Thomale, Saptarshi Mandal, and Yasir Iqbal. Phys. Rev. B . 107. 134438.
  DOI: 10.1103/PhysRevB.107.134438. 2023.
• Tensor network study of the spin-1/2 Heisenberg antiferromagnet on the shuriken lattice. Philipp Schmoll, Augustine Kshetrimayum, Jan Naumann, Jens Eisert, and Yasir Iqbal. Phys. Rev. B. 107. 064406.
  DOI: 10.1103/PhysRevB.107.064406. 2023.
• Pinch-points to half-moons and up in the stars: The kagome skymap. Dominik Kiese, Francesco Ferrari, Nikita Astrakhantsev, Nils Niggemann, Pratyay Ghosh, Tobias Müller, Ronny Thomale, Titus Neupert, Johannes Reuther, Michel J. P. Gingras, Simon Trebst, and Yasir Iqbal. Phys. Rev. Research. 5. L012025.
  DOI: 10.1103/PhysRevResearch.5.L012025. 2023.
• Multiloop functional renormalization group approach to quantum spin systems. Dominik Kiese, Tobias Müller, Yasir Iqbal, Ronny Thomale, and Simon Trebst. Phys. Rev. Research. 4. 023185.
  DOI: 10.1103/PhysRevResearch.4.023185. 2022.
• Dimerization tendencies of the pyrochlore Heisenberg antiferromagnet: A functional renormalization group perspective. Max Hering, Vincent Noculak, Francesco Ferrari, Yasir Iqbal, and Johannes Reuther. Phys. Rev. B. 105. 054426.
  DOI: 10.1103/PhysRevB.105.054426. 2022.
• Gutzwiller projected states for the J1-J2 Heisenberg model on the Kagome lattice: Achievements and pitfalls. Yasir Iqbal, Francesco Ferrari, Aishwarya Chauhan, Alberto Parola, Didier Poilblanc, and Federico Becca. Phys. Rev. B. 104 . 144406 .
  DOI: 10.1103/PhysRevB.104.144406. 2021.
• Pinwheel valence bond crystal ground state of the spin-1/2 Heisenberg antiferromagnet on the shuriken lattice. Nikita Astrakhantsev, Francesco Ferrari, Nils Niggemann, Tobias Müller, Aishwarya Chauhan, Augustine Kshetrimayum, Pratyay Ghosh, Nicolas Regnault, Ronny Thomale, Johannes Reuther, Titus Neupert, and Yasir Iqbal. Phys. Rev. B (Letters) [Editors' Suggestion]. 104. L220408.
  DOI: 10.1103/PhysRevB.104.L220408. 2021.
• Magnetic Field Induced Quantum Spin Liquid in the Two Coupled Trillium Lattices of K2Ni2(SO4)3. Ivica Živkovic, Virgile Favre, Catalina Salazar Mejia, Harald O. Jeschke, Arnaud Magrez, Bhupen Dabholkar, Vincent Noculak, Rafael S. Freitas, Minki Jeong, Nagabhushan G. Hegde, Luc Testa, Peter Babkevich, Yixi Su, Pascal Manuel, Hubertus Luetkens, Christopher Baines, Peter J. Baker, Jochen Wosnitza, Oksana Zaharko, Yasir Iqbal, Johannes Reuther, and Henrik M. Rønnow. Phys. Rev. Lett.. 127. 157204.
  DOI: 10.1103/PhysRevLett.127.157204. 2021.
• Nature of Unconventional Pairing in the Kagome Superconductors AV3Sb5 (A = K, Rb, Cs). X. Wu, T. Schwemmer, T. Müller, A. Consiglio, G. Sangiovanni, D. Di Sante, Y. Iqbal, W. Hanke, A. P. Schnyder, M. M. Denner, M. H. Fischer, T. Neupert, and R. Thomale. Phys. Rev. Lett. 127 . 177001 .
  DOI: 10.1103/PhysRevLett.127.177001 . 2021.
• Evidence for a three-dimensional quantum spin liquid in PbCuTe2O6. Shravani Chillal, Yasir Iqbal, Harald O. Jeschke, Jose A. Rodriguez-Rivera, Robert Bewley, Pascal Manuel, Dmitry Khalyavin, Paul Steffens, Ronny Thomale, A. T. M. Nazmul Islam, Johannes Reuther and Bella Lake . Nat. Commun. 11 . 2348 .
  DOI: 10.1038/s41467-020-15594-1. 2020.
• q=0 long-range magnetic order in centennialite CaCu3(OD)6Cl2.0.6D2O: A spin-1/2 perfect kagome antiferromagnet with J1-J2-Jd. K. Iida, H. K. Yoshida, A. Nakao, H. O. Jeschke, Y. Iqbal, K. Nakajima, S. Ohira-Kawamura, K. Munakata, Y. Inamura, N. Murai, M. Ishikado, R. Kumai , T. Okada, M. Oda, K. Kakurai, and M. Matsuda. Phys. Rev. B. 101 . 220408 .
  DOI: 10.1103/PhysRevB.101.220408. 2020.
• Projective symmetry group classifications of quantum spin liquids on the simple cubic, body centered cubic, and face centered cubic lattices. Jonas Sonnenschein, Aishwarya Chauhan, Yasir Iqbal, Johannes Reuther. Phys. Rev. B. 102 . 125140 .
  DOI: 10.1103/PhysRevB.102.125140. 2020.
• Degenerate manifolds, helimagnets, and multi-Q chiral phases in the classical Heisenberg antiferromagnet on the face-centered-cubic lattice. Péter Balla, Yasir Iqbal, Karlo Penc. Phys. Rev. Research. 2 . 043278 .
  DOI: 10.1103/PhysRevResearch.2.043278. 2020.
• Competing orders in a frustrated Heisenberg model on the Fisher lattice. Atanu Maity, Yasir Iqbal, Saptarshi Mandal. Phys. Rev. B. 102 . 224404 .
  DOI: 10.1103/PhysRevB.102.224404. 2020.
• Affine lattice construction of spiral surfaces in frustrated Heisenberg models. Péter Balla, Yasir Iqbal, and Karlo Penc. Phys. Rev. B. 100 . 140402.
  DOI: 10.1103/PhysRevB.100.140402. 2019.
• Quantum and Classical Phases of the Pyrochlore Heisenberg Model with Competing Interactions. Yasir Iqbal, Tobias Müller, Pratyay Ghosh, Michel J. P. Gingras, Harald O. Jeschke, Stephan Rachel, Johannes Reuther, Ronny Thomale. Phys. Rev. X. 9 . 011005 .
  DOI: 10.1103/PhysRevX.9.011005. 2019.
• Characterization of quantum spin liquids and their spinon band structures via functional renormalization. Max Hering, Jonas Sonnenschein, Yasir Iqbal, Johannes Reuther. Phys. Rev. B. 99 . 100405 .
  DOI: 10.1103/PhysRevB.99.100405. 2019.
• Quantum paramagnetism and helimagnetic orders in the Heisenberg model on the body centered cubic lattice. Pratyay Ghosh, Tobias Müller, Francesco Parisen Toldin, Johannes Richter, Rajesh Narayanan, Ronny Thomale, Johannes Reuther, and Yasir Iqbal. Phys. Rev. B. 100 . 014420 .
  DOI: 10.1103/PhysRevB.100.014420. 2019.
• Breathing chromium spinels: a showcase for a variety of pyrochlore Heisenberg Hamiltonians. Pratyay Ghosh, Yasir Iqbal, Tobias Müller, Ravi T. Ponnaganti, Ronny Thomale, Rajesh Narayanan, Johannes Reuther, Michel J. P. Gingras, Harald O. Jeschke. npj Quantum Mater. 4 . 63.
  DOI: 10.1038/s41535-019-0202-z. 2019.
• Persistence of the gapless spin liquid in the breathing kagome Heisenberg antiferromagnet. Yasir Iqbal, Didier Poilblanc, Ronny Thomale, Federico Becca. Phys. Rev. B. 97 . 115127 .
  DOI: 10.1103/PhysRevB.97.115127. 2018.
• Stability of the spiral spin liquid in MnSc2S4. Yasir Iqbal, Tobias Müller, Harald O. Jeschke, Ronny Thomale, Johannes Reuther. Phys. Rev. B. 98 . 064427 .
  DOI: 10.1103/PhysRevB.98.064427. 2018.
• Signatures of a gearwheel quantum spin liquid in a spin-1/2 pyrochlore molybdate Heisenberg antiferromagnet. Yasir Iqbal, Tobias Müller, Kira Riedl, Johannes Reuther, Stephan Rachel, Roser Valentí, Michel J. P. Gingras, Ronny Thomale, Harald O. Jeschke. Phys. Rev. Materials. 1 . 071201(R).
  DOI: 10.1103/PhysRevMaterials.1.071201. 2017.
• Intertwined nematic orders in a frustrated ferromagnet. Yasir Iqbal, Pratyay Ghosh, Rajesh Narayanan, Brijesh Kumar, Johannes Reuther, Ronny Thomale. Phys. Rev. B. 94 . 224403 .
  DOI: 10.1103/PhysRevB.94.224403. 2016.
• Spin liquid nature in the Heisenberg J1-J2 triangular antiferromagnet. Yasir Iqbal, Wen-Jun Hu, Ronny Thomale, Didier Poilblanc, Federico Becca. Phys. Rev. B. 93 . 144411 .
  DOI: 10.1103/PhysRevB.93.144411. 2016.
• Functional renormalization group for three-dimensional quantum magnetism. Yasir Iqbal, Ronny Thomale, Francesco Parisen Toldin, Stephan Rachel, Johannes Reuther. Phys. Rev. B. 94 . 140408(R).
  DOI: 10.1103/PhysRevB.94.140408. 2016.
• Comment on "Z2 spin liquid phase on the kagome lattice: a new saddle point", by Tao Li [arXiv:1601.02165 (2016)]. Yasir Iqbal, Didier Poilblanc, Federico Becca. arXiv [cond-mat.str-el]. 1606.02255. arXiv: https://doi.org/10.48550/arXiv.1606.02255 2016.
• Spin-1/2 Heisenberg J1-J2 antiferromagnet on the kagome lattice. Yasir Iqbal, Didier Poilblanc, Federico Becca. Phys. Rev. B. 91 . 020402(R).
  DOI: 10.1103/PhysRevB.91.020402. 2015.
• Paramagnetism in the kagome compounds (Zn,Mg,Cd)Cu3(OH)6Cl2. Yasir Iqbal, Harald O. Jeschke, Johannes Reuther, Roser Valentí­, I. I. Mazin, Martin Greiter, Ronny Thomale. Phys. Rev. B. 92 . 220404(R).
  DOI: 10.1103/PhysRevB.92.220404. 2015.
• Lanczos steps to improve variational wave functions. Federico Becca, Wen-Jun Hu, Yasir Iqbal, Alberto Parola, Didier Poilblanc, Sandro Sorella. J. Phys.: Conf. Ser.. 640 . 012039 .
  DOI: 10.1088/1742-6596/640/1/012039. 2015.
• Vanishing spin gap in a competing spin-liquid phase in the kagome Heisenberg antiferromagnet. Yasir Iqbal, Didier Poilblanc, Federico Becca. Phys. Rev. B. 89 . 020407(R).
  DOI: 10.1103/PhysRevB.89.020407. 2014.
• Quantum-statistics-induced flow patterns in driven ideal Fermi gases. Marco Beria, Yasir Iqbal, Massimiliano Di Ventra, Markus Müller. Phys. Rev. A. 88 . 043611 .
  DOI: 10.1103/PhysRevA.88.043611. 2013.
• Gapless spin-liquid phase in the kagome spin-1/2 Heisenberg antiferromagnet. Yasir Iqbal, Federico Becca, Sandro Sorella, Didier Poilblanc. Phys. Rev. B. 87 . 060405(R).
  DOI: 10.1103/PhysRevB.87.060405. 2013.
• Valence-bond crystals in the kagome spin-1/2 Heisenberg antiferromagnet: a symmetry classification and projected wave function study. Yasir Iqbal, Federico Becca, Didier Poilblanc. New J. Phys.. 14 . 115031 .
  DOI: 10.1088/1367-2630/14/11/115031. 2012.
• Projected wave function study of Z2 spin liquids on the kagome lattice for the spin-1/2 quantum Heisenberg antiferromagnet. Yasir Iqbal, Federico Becca, Didier Poilblanc. Phys. Rev. B. 84 . 020407(R) .
  DOI: 10.1103/PhysRevB.84.020407. 2011.
• Valence-bond crystal in the extended kagome spin-1/2 quantum Heisenberg antiferromagnet: A variational Monte Carlo approach. Yasir Iqbal, Federico Becca, Didier Poilblanc. Phys. Rev. B. 83 . 100404(R) .
  DOI: 10.1103/PhysRevB.83.100404. 2011.
• Projective symmetry group classification of Abrikosov fermion mean-field ansätze on the square-octagon lattice. Atanu Maity, Francesco Ferrari, Ronny Thomale, Saptarshi Mandal, and Yasir Iqbal. Phys. Rev. B. 107. 134438.
  DOI: 10.1103/PhysRevB.107.134438. 0.

Teaching

• 2018 :  (Jan - May) - PH5720 Numerical Methods and Programming Lab; (Jul - Nov) - PH5730 Methods of Computational Physics
• 2019 :  (Jan - May) - PH1020 Physics II
• 2020 :  (Jan - May) - PH1020 Physics II
• 2021 :  (Jan - May) - PH1020 Physics II ; (Jul - Nov) - EP4040 Seminar / EP4140 Project / PH1010 Physics I
• 2022 :  (Jan - May) - EP4150 Project / PH1020 Physics II ; (Jul - Nov) - PH1010 Physics I
• 2023 :  (Jan - May) - PH1020 Physics II / PH5680 Superconductivity & Its Applications