@article {jian_landau_2020,
title = {Landau poles in condensed matter systems},
journal = {Phys. Rev. Res.},
volume = {2},
number = {2},
year = {2020},
note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article},
month = {jun},
abstract = {The existence or not of Landau poles is one of the oldest open questions in nonasymptotic quantum field theories. We investigate the Landau pole issue in two condensed matter systems whose long-wavelength physics is described by appropriate quantum field theories: the critical quantum magnet and Dirac fermions in graphene with long-range Coulomb interactions. The critical quantum magnet provides a classic example of a quantum phase transition, and it is well described by the phi(4) theory. We find that the irrelevant but symmetry-allowed couplings, such as the phi(6) potential, can significantly change the fate of the Landau pole in the emergent phi(4) theory. We obtain the coupled beta functions of a phi(4) + phi(6) potential at both small and large orders. Already from the one-loop calculation, the Landau pole is replaced by an ultraviolet fixed point. A Lipatov analysis at large orders reveals that the inclusion of a phi(6) term also has important repercussions for the high-order expansion of the beta functions. We also investigate the role of the Landau pole in a very different system: Dirac fermions in 2 + 1 dimensions with long-range Coulomb interactions, e.g., graphene. Both the weak-coupling perturbation theory up to two loops and a low-order large-N calculation show the absence of a Landau pole. Furthermore, we calculate the asymptotic expansion coefficients of the beta function. We find that the asymptotic coefficient is bounded by that of a pure bosonic phi(4) theory, and consequently graphene is free from Landau poles if the pure (4) theory does not manifest a Landau pole. We briefly discuss possible experiments that could potentially probe the existence of a Landau pole in these systems. Studying Landau poles in suitable condensed matter systems is of considerable fundamental importance since the relevant Landau pole energy scales in particle physics, whether it is quantum electrodynamics or Higgs physics, are completely unattainable.},
doi = {10.1103/PhysRevResearch.2.023310},
author = {Jian, Shao-Kai and Barnes, Edwin and Das Sarma, Sankar}
}
@article {ISI:000457732400003,
title = {Linear-in-T resistivity in dilute metals: A Fermi liquid perspective},
journal = {Phys. Rev. B},
volume = {99},
number = {8},
year = {2019},
month = {FEB 4},
pages = {085105},
publisher = {AMER PHYSICAL SOC},
type = {Article},
abstract = {We consider a short-range deformation-potential scattering model of electron-acoustic phonon interaction to calculate the resistivity of an ideal metal (i.e., no other scattering mechanism except acoustic phonon scattering) as a function of temperature (T) and electron density (n). The resistivity calculation is based on the Boltzmann transport theory within the relaxation-time approximation in the nearly-free-electron single-band approximation. We consider both 3D metals and 2D metals and focus on the dilute limit, i.e., low effective metallic carrier density (and hence low effective Fermi wave number k(F)) of the system. The main findings are (1) a phonon-scattering-induced linear-in-T resistivity could persist to arbitrarily low temperatures in the dilute limit independent of the Debye temperature (T-D), although, eventually, the low-T resistivity turns over to the expected Bloch-Grfineisen (BG) behavior with T-5(T-4) dependence, in 3D (2D), respectively, with the crossover temperature, T-BG, from the linear-in-T to the BG behavior, being proportional to the Fermi momentum, is small in the dilute limit; (2) because of low values of n, the phonon-induced resistivity could be very high in the system, orders of magnitude above the corresponding room temperature resistivity of ordinary metals; and (3) the resistivity shows an intrinsic saturation effect at very high temperatures (for T > T-D) and, in fact, weakly decreases with increasing T above a high crossover temperature with this crossover being dependent on both T-D and n in a nonuniversal manner-this high-temperature crossover is not directly connected with the Mott-Ioffe-Regel limit and is a reflection of phonon phase-space restriction. We discuss the qualitative trends in the resistivity as a function of temperature, density, phonon velocity, and system dimensionality. We also provide {\textquoteleft}{\textquoteleft}high-temperature{{\textquoteright}{\textquoteright}} linear-in-T resistivity results for 2D and 3D Dirac materials. Our work brings out the universal features of phonon-induced transport in dilute metals, and we comment on possible implications of our results for strange metals, emphasizing that the mere observation of a linear-in-T metallic resistivity at low temperatures or a very high metallic resistivity at high temperatures is not necessarily a reason to invoke an underlying quantum critical strange-metal behavior. Dilute metals may very well have highly unusual (compared with normal metals) transport properties arising from quantitative, but not qualitatively new, underlying physics. We discuss the temperature variation of the effective transport scattering rate showing that, for reasonable parameters, the scattering rate could be below or above k(B)T and, in particular, purely coincidentally, the calculated scattering rate happens to be k(B)T in normal metals with no implications whatsoever for the so-called Planckian behavior. Our work manifestly establishes that an apparent Planckian dissipative behavior could arise from the usual electron-phonon interaction without implying any strange metallicity or a failure of the quasiparticle paradigm in contrast to recent claims.},
issn = {2469-9950},
doi = {10.1103/PhysRevB.99.085105},
author = {Hwang, E. H. and S. Das Sarma}
}
@article {ISI:000391851800003,
title = {Logarithmic entanglement lightcone in many-body localized systems},
journal = {PHYSICAL REVIEW B},
volume = {95},
number = {2},
year = {2017},
month = {JAN 10},
pages = {024202},
abstract = {We theoretically study the response of a many-body localized system to a local quench from a quantum information perspective. We find that the local quench triggers entanglement growth throughout the whole system, giving rise to a logarithmic lightcone. This saturates the modified Lieb-Robinson bound for quantum information propagation in many-body localized systems previously conjectured based on the existence of local integrals of motion. In addition, near the localization-delocalization transition, we find that the final states after the local quench exhibit volume-law entanglement. We also show that the local quench induces a deterministic orthogonality catastrophe for highly excited eigenstates, where the typical wave-function overlap between the pre- and postquench eigenstates decays exponentially with the system size.},
issn = {2469-9950},
doi = {10.1103/PhysRevB.95.024202},
author = {Deng, Dong-Ling and Li, Xiaopeng and Pixley, J. H. and Wu, Yang-Le and S. Das Sarma}
}
@article {ISI:000312829800033,
title = {Loop-structure stability of a double-well-lattice Bose-Einstein condensate},
journal = {Phys. Rev. A},
volume = {86},
number = {6},
year = {2012},
month = {dec},
pages = {063636},
keywords = {CMAMO, Multiple Fellows},
issn = {1050-2947},
doi = {10.1103/PhysRevA.86.063636},
author = {Hui, Hoi-Yin and Ryan Barnett and J V Porto and S. Das Sarma}
}
@article {Biddle2011,
title = {Localization in one-dimensional lattices with non-nearest-neighbor hopping: Generalized Anderson and Aubry-Andr{\'e} models},
journal = {Phys. Rev. B},
volume = {83},
number = {7},
year = {2011},
month = {feb},
pages = {075105},
keywords = {2011, Single Fellow},
issn = {1098-0121},
url = {http://prb.aps.org/abstract/PRB/v83/i7/e075105 http://prb.aps.org/abstract/PRB/v83/i8/e089901},
author = {J Biddle and Priour, D. and Bin Wang and S. Das Sarma}
}
@article { ISI:000295163300002,
title = {Low-noise conditional operation of singlet-triplet coupled quantum dot qubits},
journal = {PHYSICAL REVIEW B},
volume = {84},
number = {12},
year = {2011},
month = {SEP 23},
issn = {1098-0121},
doi = {10.1103/PhysRevB.84.121306},
author = {Yang, Shuo and S. Das Sarma}
}
@article {Biddle2009,
title = {Localization in one-dimensional incommensurate lattices beyond the Aubry-Andr{\'e} model},
journal = {Phys. Rev. A},
volume = {80},
number = {2},
year = {2009},
month = {aug},
keywords = {2009, Single Fellow},
issn = {1050-2947},
url = {http://pra.aps.org/abstract/PRA/v80/i2/e021603},
author = {J Biddle and Bin Wang and Priour, D. and S. Das Sarma}
}
@article {Lutchyn2009,
title = {Loss of superfluidity by fermions in the boson Hubbard model on an optical lattice},
journal = {Phys. Rev. A},
volume = {79},
number = {1},
year = {2009},
month = {jan},
keywords = {2009},
issn = {1050-2947},
url = {http://pra.aps.org/abstract/PRA/v79/i1/e011606},
author = {Roman M Lutchyn and Tewari, Sumanta and S. Das Sarma}
}
@article { ISI:000257289500127,
title = {Limit to two-dimensional mobility in modulation-doped GaAs quantum structures: How to achieve a mobility of 100 million},
journal = {PHYSICAL REVIEW B},
volume = {77},
number = {23},
year = {2008},
month = {JUN},
issn = {1098-0121},
doi = {10.1103/PhysRevB.77.235437},
author = {Hwang, E. H. and S. Das Sarma}
}