233 citations · 1.8k across the 38 of their papers we have counts for
39 papers
Dissipative Majorana Chain---Anomalies and Non-Invertible Symmetries
Hung-Hsuan Teh, Tokiro Numasawa
We study symmetries and anomalies of dissipative Majorana chains described by Lindblad dynamics. Using the operator-state mapping, we represent the Lindbladian as a non-Hermitian o…
Effective Field Theory of Noncritical M-theory from Bosonization
Patrick Jefferson, Tokiro Numasawa
We extend the coadjoint orbit approach to bosonization systematized by Delacretaz-Du-Mehta-Son to double-scaled non-relativistic Fermi liquids with central inverted harmonic oscill…
Emergent Andreev Reflection from a Lattice Duality Defect
Atsushi Ueda, Tokiro Numasawa, Boris De Vos +1
Andreev reflection converts an incoming fermion into an outgoing hole and is usually tied to a superconducting interface. We show that an analogous charge-conjugating boundary cond…
Direct observation of the transverse near field of an edge excitation in a fractional quantum Hall state
Yunhyeon Jeong, Akinori Kamiyama, John N. Moore +6
Stroboscopic time-resolved photoluminescence (PL) microscopy and spectroscopy reveal that an electrically launched edge excitation in a fractional quantum Hall (FQH) state…
Spatiotemporal imaging of gate-controlled multipath dynamics of fractional quantum Hall edge excitations
Yunhyeon Jeong, Akinori Kamiyama, John N. Moore +6
Quantum Hall edge excitations, whose low-energy behavior admits a chiral conformal-field-theory description, are a promising platform for engineered dynamical experiments, includin…
Anomalous Bulk Current in Quantum Hall Systems with an Expanding Edge
Yuuki Sugiyama, Tokiro Numasawa
Understanding topological phases of matter is essential for advancing both the fundamental theory and practical applications of condensed matter physics. Recently, a theoretical fr…
Inverse Spin Hall Effect in Nonequilibrium Dirac Systems Induced by Anomalous Flow Imbalance
Hung-Hsuan Teh, Tokiro Numasawa, Shun Okumura +1
We study Dirac fermions in the presence of a space-dependent chiral gauge field and thermodynamic gradients, establishing a connection to the inverse spin Hall effect. The chiral g…
Floquet engineered inhomogeneous quantum chaos in critical systems
Bastien Lapierre, Tokiro Numasawa, Titus Neupert +1
We study universal chaotic dynamics of a large class of periodically driven critical systems described by spatially inhomogeneous conformal field theories. By employing an effectiv…
Gauging spacetime inversions in quantum gravity
Daniel Harlow, Tokiro Numasawa
Spacetime inversion symmetries such as parity and time reversal play a central role in physics, but they are usually treated as global symmetries. In quantum gravity there are no g…
Bridging two quantum quench problems -- local joining quantum quench and Möbius quench -- and their holographic dual descriptions
Jonah Kudler-Flam, Masahiro Nozaki, Tokiro Numasawa +2
We establish an equivalence between two different quantum quench problems, the joining local quantum quench and the Möbius quench, in the context of -dimensional conformal f…
Inhomogeneous Quantum Quenches of Conformal Field Theory with Boundaries
Xinyu Liu, Alexander McDonald, Tokiro Numasawa +2
We develop a method to calculate generic time-dependent correlation functions for inhomogeneous quantum quenches in (1+1)-dimensional conformal field theory (CFT) induced by sudden…
Symmetry of Open Quantum Systems: Classification of Dissipative Quantum Chaos
Kohei Kawabata, Anish Kulkarni, Jiachen Li +2
We develop a theory of symmetry in open quantum systems. Using the operator-state mapping, we characterize symmetry of Liouvillian superoperators for the open quantum dynamics by s…
On SYK traversable wormhole with imperfectly correlated disorders
Tomoki Nosaka, Tokiro Numasawa
In this paper we study the phase structure of two Sachdev-Ye-Kitaev models (L-system and R-system) coupled by a simple interaction, with imperfectly correlated disorder. When the d…
Liouville Theory and the Weil-Petersson Geometry of Moduli Space
Sarah M. Harrison, Alexander Maloney, Tokiro Numasawa
Liouville theory describes the dynamics of surfaces with constant negative curvature and can be used to study the Weil-Petersson geometry of the moduli space of Riemann surfaces. T…
Dynamical quantum phase transitions in SYK Lindbladians
Kohei Kawabata, Anish Kulkarni, Jiachen Li +2
We study the open quantum dynamics of the Sachdev-Ye-Kitaev (SYK) model described by the Lindblad master equation, where the SYK model is coupled to Markovian reservoirs with jump…
Entanglement Phase Transition Induced by the Non-Hermitian Skin Effect
Kohei Kawabata, Tokiro Numasawa, Shinsei Ryu
Recent years have seen remarkable development in open quantum systems effectively described by non-Hermitian Hamiltonians. A unique feature of non-Hermitian topological systems is…
Universal Dynamics of Heavy Operators in Boundary CFT
Tokiro Numasawa, Ioannis Tsiares
We derive a universal asymptotic formula for generic boundary conditions for the average value of the bulk-to-boundary and boundary Operator Product Expansion coefficients of any u…
Lindbladian dynamics of the Sachdev-Ye-Kitaev model
Anish Kulkarni, Tokiro Numasawa, Shinsei Ryu
We study the Lindbladian dynamics of the Sachdev-Ye-Kitaev (SYK) model, where the SYK model is coupled to Markovian reservoirs with jump operators that are either linear or quadrat…
Four coupled SYK models and Nearly AdS gravities: Phase Transitions in Traversable wormholes and in Bra-ket wormholes
Tokiro Numasawa
We study four coupled SYK models and nearly AdS gravities. In the SYK model side, we construct a model that couples two copies of two coupled SYK models. In nearly AdS grav…
Chaos exponents of SYK traversable wormholes
Tomoki Nosaka, Tokiro Numasawa
In this paper we study the chaos exponent, the exponential growth rate of the out-of-time-ordered four point functions, in a two coupled SYK models which exhibits a first order pha…
Quantum Chaos, Thermodynamics and Black Hole Microstates in the mass deformed SYK model
Tomoki Nosaka, Tokiro Numasawa
We study various aspects of the mass deformed SYK model which can escape the interiors of pure boundary state black holes. SYK boundary states are given by a simple local boundary…
Double Local Quenches in 2D CFTs and Gravitational Force
Pawel Caputa, Tokiro Numasawa, Teppei Shimaji +2
In this work we extensively study the dynamics of excited states created by instantaneous local quenches at two different points, i.e., double local quenches. We focus on setups in…
Late Time Quantum Chaos of pure states in the SYK model
Tokiro Numasawa
In this letter, we study the return amplitude, which is the overlap between the initial state and the time evolved state, in the Sachdev-Ye-Kitaev (SYK) model. Initial states are t…
Global Spacetime Structure of Compactified Inflationary Universe
Tokiro Numasawa, Daisuke Yoshida
We investigate the global spacetime structure of torus de Sitter universe, which is exact de Sitter space with torus identification based on the flat chart. We show that past incom…