18 citations · 67 across the 12 of their papers we have counts for
12 papers
Magnetic-Field-Driven Dimensional Reduction in a Quantum Antiferromagnet
Subhankar Khatua, Marcin Raczkowski, Jeroen van den Brink +1
Low dimensionality enhances quantum fluctuations, triggering novel states of quantum matter to emerge. In real materials, low dimensionality usually arises from spatially strongly…
Finite-Size Spectral Signatures of Order by Quantum Disorder: A Perspective from Anderson's Tower of States
Subhankar Khatua, Griffin C. Howson, Michel J. P. Gingras +1
In frustrated magnetic systems with a subextensive number of classical ground states, quantum zero-point fluctuations can select a unique long-range ordered state, a celebrated phe…
Anharmonic Collective Oscillations in Isotropic Spin Systems and their Spectroscopic Signatures
Anna Fancelli, Matías G. Gonzalez, Subhankar Khatua +4
Spin waves are the fundamental excitations in magnetically ordered spin systems and are ubiquitously observed in magnetic materials. However, the standard understanding of spin wav…
Magnon topology driven by altermagnetism
Subhankar Khatua, Volodymyr P. Kravchuk, Kostiantyn V. Yershov +1
Altermagnets present a class of fully compensated collinear magnetic order, where the two sublattices are not related merely by time-reversal combined with lattice translation or i…
Universal temperature-dependent power law excitation gaps in frustrated quantum spin systems harboring order-by-disorder
Alexander Hickey, Jeffrey G. Rau, Subhankar Khatua +1
When magnetic moments are subject to competing or frustrated interactions, continuous degeneracies that are not protected by any symmetry of the parent Hamiltonian can emerge at th…
Ground state properties of the Heisenberg-compass model on the square lattice
Subhankar Khatua, Griffin C. Howson, Michel J. P. Gingras +1
Compass models provide insights into the properties of Mott-insulating materials that host bond-dependent anisotropic interactions between their pseudospin degrees of freedom. In t…
Pseudo-Goldstone modes and dynamical gap generation from order-by-thermal-disorder
Subhankar Khatua, Michel J. P. Gingras, Jeffrey G. Rau
Accidental ground state degeneracies -- those not a consequence of global symmetries of the Hamiltonian -- are inevitably lifted by fluctuations, often leading to long-range order,…
Berry phase in the rigid rotor: the emergent physics of odd antiferromagnets
Subhankar Khatua, R. Ganesh
The rigid rotor is a classic problem in quantum mechanics, describing the dynamics of a rigid body with its centre of mass held fixed. The configuration space of this problem is $S…
State selection in frustrated magnets
Subhankar Khatua, Sarvesh Srinivasan, R. Ganesh
Magnets with frustration often show accidental degeneracies, characterized by a large classical ground-state space (CGSS). Quantum fluctuations may `select' one of these ground sta…
Order by singularity in Kitaev clusters
Sarvesh Srinivasan, Subhankar Khatua, G. Baskaran +1
The Kitaev model is a beautiful example of frustrated interactions giving rise to deep and unexpected phenomena. In particular, its classical version has remarkable properties stem…
Effective theories for quantum spin clusters: Geometric phases and state selection by singularity
Subhankar Khatua, Diptiman Sen, R. Ganesh
Magnetic systems with frustration often have large classical degeneracy. We show that their low-energy physics can be understood as dynamics within the space of classical ground st…
The quantum spin quadrumer
Subhankar Khatua, R. Shankar, R. Ganesh
A fundamental motif in frustrated magnetism is the fully mutually coupled cluster of spins, with each spin coupled to every other spin. Clusters with and have been ex…