Siddhartha Lal
Associate Professor
Dept: Physical Sciences (DPS)
E-mail: slal [at] iiserkol.ac.in
Personal homepage: Click Here
I am a condensed matter theorist. My research involves understanding the physics of strongly interacting quantum matter, with topics ranging from strongly-correlated electronic systems, quantum magnetism, topological phases of matter, non-Fermi liquids, unconventional superconductivity, many-particle entanglement, low-dimensional systems and quantum transport. One of my primary goals is to understand the fascinating and complex phenomenology displayed by many materials studied in the laboratory. I approach the problem by studying paradigmatic model Hamiltonians that are known to capture effectively the physics at the heart of many well-known quantum materials. An excellent example involves studying the two-dimensional Hubbard model on the square lattice to understand the enduring puzzle of high-temperature superconductivity displayed by the Cuprate family of materials. Such problems are hard as inter-particle interactions are of the same order as the kinetic energies, often causing perturbative approaches to fail. For dealing with such problems, I have developed a non-perturbative framework based on the renormalisation group. This is yielded a host of fresh insights and results on several challenging problems. Please consult my personal website (link given above) for further details.
- Ph.D (Physics), Indian Institute of Science, Bangalore, 2003
- M.S. (Physics), Indian Institute of Science, Bangalore, 1998
- B.Sc. (Hons.) (Physics), Asutosh College (University of Calcutta), 1995
- Associate Professor, IISER Kolkata (current)
- Assistant Professor, IISER Kolkata (2010 - 2019)
- Postdoctoral Fellow, Department of Physics and Inst. for Cond. Matt. Theory, Univ. of Illinois at Urbana-Champaign (2008 - 2010)
- Postdoctoral Fellow, Abdus Salam International Centre for Theoretical Physics, Trieste (2006 - 2008)
- Postdoctoral Fellow, Institute for Theoretical Physics, University of Cologne (2002 - 2006)
- Ramanujan Fellowship from Department of Science and Technology, Govt. of India (2010)
- Patra, Siddhartha; Mukherjee, Abhirup; Mukherjee, Anirban; Vidhyadhiraja, N. S.; Taraphder, A. and Lal, Siddhartha. 2023."Frustration shapes multi-channel Kondo physics: a star graph perspective." Journal of Physics: Condens. Matter, 35, 315601
- Patra, Siddhartha; Basu, Somnath and Lal, Siddhartha. 2022."Unveiling topological order through multipartite entanglement." Physical Review A, 105 , 052428
- Mukherjee, Anirban and Lal, Siddhartha. 2022."Superconductivity from repulsion in the doped 2D electronic Hubbard model: an entanglement perspective." J. Phys.: Condens. Matter, 34, 275601
- Mukherjee, Anirban; Mukherjee, Abhirup; Vidhyadhiraja, N. S.; Taraphder, A. and Lal, Siddhartha. 2022."Unveiling the Kondo cloud: Unitary renormalization-group study of the Kondo model." Physical Review B, 105, 085119
- Patra, Siddhartha and Lal, Siddhartha. 2021."Origin of topological order in a Cooper-pair insulator." Physical Review B, 104, 144514