Shivaji L. Sondhi | |
---|---|
Born | |
Nationality | American |
Alma mater | Hindu College, University of Delhi University of California, Los Angeles |
Known for | time crystals localization-protected quantum order spin liquid spin ice frustrated magnetism skyrmions |
Awards | Alfred P. Sloan Fellowship William L. McMillan Award David and Lucile Packard Fellowship EPS Europhysics Prize Humboldt Research Award Leverhulme International Professorship |
Scientific career | |
Fields | Quantum physics |
Institutions | University of Oxford New College, Oxford Princeton University |
Doctoral advisor | Steven Kivelson |
Doctoral students | Vedika Khemani |
Shivaji Lal Sondhi is an Indian-born theoretical physicist who is currently the Wykeham Professor of Physics in the Rudolf Peierls Centre for Theoretical Physics at the University of Oxford, known for contributions to the field of quantum condensed matter. He is son of former Lok Sabha MP Manohar Lal Sondhi. [1]
Sondhi was brought up in Delhi, India, where he was educated through high school at Sardar Patel Vidyalaya. He received a B.Sc. in physics from Hindu College, University of Delhi in 1984. [2] He enrolled in the doctoral program in physics at the State University of New York at Stony Brook and began working under the supervision of Steven Kivelson. [2] Around 1988–89, Sondhi moved with his advisor to the University of California, Los Angeles, where he received his PhD in 1992. [2] He spent three years as a postdoctoral researcher at the University of Illinois, Urbana-Champaign (formally under the joint supervision of Gordon Baym, Eduardo Fradkin, Paul Goldbart, and Michael Stone [3] at what is now the Institute for Condensed Matter Theory), before taking up an assistant professorship at Princeton in 1995. [2] At Princeton, Sondhi was promoted to associate professor in 2001, and to professor of physics in 2005. [2] He served as a Senior Fellow of the Princeton Center for Theoretical Science (which he co-founded) from 2006–08. Sondhi remained at Princeton until 2021, when he was appointed to the Wykeham Professorship at the University of Oxford, succeeding David Sherrington. [4]
Sondhi has worked extensively across a wide range of topics in theoretical condensed matter physics, notably in the areas of topological phases of matter, strongly correlated electrons, and quantum magnetism. His recent research activity focuses on the study of many-body quantum dynamics. Sondhi's most significant contributions include the discovery of skyrmions in the quantum Hall effect (with A. Karlhede, S. Kivelson and E. Rezayi), [5] the identification of a resonating valence bond liquid phase in the triangular lattice quantum dimer model (with R. Moessner), [6] the theoretical prediction of magnetic monopoles in spin ice (with C. Castelnovo and R. Moessner), [7] and for proposing the -spin glass/time crystal state of periodically driven (Floquet) systems (with V. Khemani, A. Lazarides and R. Moessner). [8]
In 1996, Sondhi was awarded the William L. McMillan Award in condensed matter physics from the University of Illinois. [9] He is a recipient of both the Alfred P. Sloan Fellowship [10] (1996) and of a David and Lucile Packard Fellowship [11] (1998), and was elected a Fellow of the American Physical Society in 2008. [12] He also received a Humboldt Research Award from the Alexander von Humboldt Foundation in 2015. [13] Sondhi was awarded a 2020 Leverhulme International Professorship to be held at the University of Oxford. [14]
In 2012, Sondhi shared the EPS Europhysics Prize with Steven T. Bramwell, Claudio Castelnovo, Santiago Grigera, Roderich Moessner, and Alan Tennant, for the prediction and experimental observation of magnetic monopoles in spin ice. [15]
Sondhi also directed a program on India and the World [16] at the Center for International Security Studies at the Woodrow Wilson School of Princeton University. Previously, he co-founded and co-directed a program on Oil, Energy and the Middle East at Princeton. [17]
In particle physics, a magnetic monopole is a hypothetical elementary particle that is an isolated magnet with only one magnetic pole. A magnetic monopole would have a net north or south "magnetic charge". Modern interest in the concept stems from particle theories, notably the grand unified and superstring theories, which predict their existence. The known elementary particles that have electric charge are electric monopoles.
A spin ice is a magnetic substance that does not have a single minimal-energy state. It has magnetic moments (i.e. "spin") as elementary degrees of freedom which are subject to frustrated interactions. By their nature, these interactions prevent the moments from exhibiting a periodic pattern in their orientation down to a temperature much below the energy scale set by the said interactions. Spin ices show low-temperature properties, residual entropy in particular, closely related to those of common crystalline water ice. The most prominent compounds with such properties are dysprosium titanate (Dy2Ti2O7) and holmium titanate (Ho2Ti2O7). The orientation of the magnetic moments in spin ice resembles the positional organization of hydrogen atoms (more accurately, ionized hydrogen, or protons) in conventional water ice (see figure 1).
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In condensed matter physics, a time crystal is a quantum system of particles whose lowest-energy state is one in which the particles are in repetitive motion. The system cannot lose energy to the environment and come to rest because it is already in its quantum ground state. Because of this, the motion of the particles does not really represent kinetic energy like other motion; it has "motion without energy". Time crystals were first proposed theoretically by Frank Wilczek in 2012 as a time-based analogue to common crystals – whereas the atoms in crystals are arranged periodically in space, the atoms in a time crystal are arranged periodically in both space and time. Several different groups have demonstrated matter with stable periodic evolution in systems that are periodically driven. In terms of practical use, time crystals may one day be used as quantum computer memory.
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