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Gappability Index for Quantum Many-Body Systems
Yuan Yao, Masaki Oshikawa, Akira Furusaki
We propose an index which characterizes the degree of ingappability, namely the difficulty to induce a unique ground state with a nonvanishing excitation gap, in th…
Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions
Kanta Masuki, Hiroyuki Sudo, Masaki Oshikawa +1
Dissipative quantum phase transition has been widely believed to occur in a Josephson junction coupled to a resistor despite a lack of concrete experimental evidence. Here, on the…
Adiabatic transport in one-dimensional systems with a single defect
Kazuaki Takasan, Masaki Oshikawa, Haruki Watanabe
The adiabatic transport properties of U(1) invariant systems are determined by the dependence of the ground state energy on the twisted boundary condition. We examine a one-dimensi…
Resolving the Berezinskii-Kosterlitz-Thouless transition in the 2D XY model with tensor-network based level spectroscopy
Atsushi Ueda, Masaki Oshikawa
Berezinskii-Kosterlitz-Thouless transition of the classical XY model is re-investigated, combining the Tensor Network Renormalization (TNR) and the Level Spectroscopy method based…
Two-wire Junction of Inequivalent Tomonaga-Luttinger Liquids
Yao-Tai Kang, Chung-Yu Lo, Masaki Oshikawa +2
We develop two novel numerical schemes to study the conductance of the two-wire junction of inequivalent Tomonaga-Luttinger Liquids. In the first scheme we use the static current-c…
-Symmetric Quantum Spin-Orbital Liquids on Various Lattices
Masahiko G. Yamada, Masaki Oshikawa, George Jackeli
An emergent symmetry discovered in the microscopic model for honeycomb materials [M.~G.~Yamada, M.~Oshikawa, and G.~Jackeli, Phys. Rev. Lett. \textbf{121}, 0…