661 citations · 4.3k across the 54 of their papers we have counts for
12 papers · 1 filter
Highly tunable optics across a topological transition in organic polymers
Davide Romanin, Matteo Calandra, Alex W. Chin
Controllable topological phase transitions are appealing as they allow for tunable single particle electronic properties. Here, by using state-of-the-art manybody perturbation theo…
How Does the Symmetry of S1 Influence Exciton Transport in Conjugated Polymers?
Raj Pandya, Antonios M. Alvertis, Qifei Gu +7
Many optoelectronic devices based on organic materials require rapid and long-range singlet exciton transport. Key factors that control the transport of singlet excitons includes t…
Tensor Network simulation of polaron-polaritons in organic microcavities
Javier del Pino, Florian A. Y. N. Schröder, Alex W. Chin +2
In the regime of strong coupling between molecular excitons and confined optical modes, the intra-molecular degrees of freedom are profoundly affected, leading to a reduced vibrati…
Tensor network simulation of non-Markovian dynamics in organic polaritons
Javier del Pino, Florian A. Y. N. Schröder, Alex W. Chin +2
We calculate the exact many-body time dynamics of polaritonic states supported by an optical cavity filled with organic molecules. Optical, vibrational and radiative processes are…
Uncovering nonperturbative dynamics of the biased sub-Ohmic spin-boson model with variational Matrix Product States
C. Gonzalez-Ballestero, Florian A. Y. N. Schröder, Alex Chin
We study the dynamics of the biased sub-Ohmic spin-boson model by means of a time-dependent variational matrix product state (TDVMPS) algorithm. The evolution of both the system an…
Energy Efficient Dissociation of Excitons to Free Charges
Maxim Tabachnyk, Samuel L. Smith, Leah R. Weiss +4
In photovoltaics (PVs) and artificial photosynthetic systems based on excitons, the question of how energy must be lost in overcoming the Coulomb barrier, converting excitons to fr…
Simulating open quantum dynamics with time-dependent variational matrix product states: Towards microscopic correlation of environment dynamics and reduced system evolution
Florian A. Y. N. Schröder, Alex W. Chin
Many-body approaches to open quantum systems have recently become powerful tools for investigating the detailed role of dissipative environments in diverse non-equilibrium molecula…
A generalized multi-polaron expansion for the spin-boson model: Environmental entanglement and the biased two-state system
Soumya Bera, Ahsan Nazir, Alex W. Chin +2
We develop a systematic variational coherent state expansion for the many-body ground state of the spin-boson model, in which a quantum two-level system is coupled to a continuum o…
Unveiling environmental entanglement in strongly dissipative qubits
Soumya Bera, Serge Florens, Harold Baranger +3
The coupling of a qubit to a macroscopic reservoir plays a fundamental role in understanding the complex transition from the quantum to the classical world. Considering a harmonic…
Ground state and dynamics of the biased dissipative two-state system: Beyond variational polaron theory
Ahsan Nazir, Dara P. S. McCutcheon, Alex W. Chin
We propose a ground-state ansatz for the Ohmic spin-boson model that improves upon the variational treatment of Silbey and Harris for biased systems in the scaling limit. In partic…
Failure of the displaced-squeezed state for spin-boson models in the thermodynamic limit
A. W. Chin
We present an analysis of a variational coherent-squeezed state that has been discussed in the literature as a potential ground state for the spin-boson model. We show that when th…
Coherent-incoherent transition in the sub-Ohmic spin-boson model
Alex Chin, Misha Turlakov
We study the spin-boson model with a sub-Ohmic bath using a variational method. The transition from coherent dynamics to incoherent tunneling is found to be abrupt as a function of…