@article { ISI:000579337200002,
title = {Fermi-surface topology and renormalization of bare ellipticity in an interacting anisotropic electron gas},
journal = {Phys. Rev. B},
volume = {102},
number = {16},
year = {2020},
month = {OCT 19},
pages = {161114},
publisher = {AMER PHYSICAL SOC},
type = {Article},
abstract = {We investigate effects of electron-electron interactions on the shape of the Fermi surface in an anisotropic two-dimensional electron gas using the {\textquoteleft}{\textquoteleft}RPA-GW{{\textquoteright}{\textquoteright}} self-energy approximation. We find that the interacting Fermi surface deviates from an ellipse but not in an arbitrary way. The interacting Fermi surface has only two qualitatively distinct shapes for most values of r(s). The Fermi surface undergoes two distinct transitions between these two shapes as r(s) increases. For larger r(s), the degree of the deviation from an ellipse rapidly increases, but, in general, our theory provides a justification for the widely used elliptical Fermi-surface approximation, even for the interacting system, since the nonelliptic corrections are quantitatively rather small except for very large r(s).},
issn = {2469-9950},
doi = {10.1103/PhysRevB.102.161114},
author = {Ahn, Seongjin and Das Sarma, S.}
}
@article { ISI:000552576600008,
title = {Fidelity of a sequence of SWAP operations on a spin chain},
journal = {Phys. Rev. B},
volume = {102},
number = {3},
year = {2020},
month = {JUL 27},
pages = {035439},
publisher = {AMER PHYSICAL SOC},
type = {Article},
abstract = {We consider the {\textquoteleft}{\textquoteleft}transport{{\textquoteright}{\textquoteright}} of the state of a spin across a Heisenberg-coupled spin chain via the use of repeated SWAP gates, starting with one of two states-one in which the leftmost spin is down and the others up, and one in which the leftmost two spins are in a singlet state (i.e., they are entangled), and the others are again all up. More specifically, we transport the state of the leftmost spin in the first case and the next-to-leftmost spin in the second to the other end of the chain, and then back again. We accomplish our SWAP operations here by increasing the exchange coupling between the two spins that we operate on from a base value J to a larger value J(SWAP) for a time t = pi(h) over bar /4J(SWAP). We determine the fidelity of this sequence of operations in a number of situations-one in which only nearest-neighbor coupling exists between spins and there is no magnetic dipole-dipole coupling or noise (the most ideal case), one in which we introduce next-nearest-neighbor coupling, but none of the other effects, and one in which all of these effects are present. In the last case, the noise is assumed to be quasistatic, i.e., the exchange couplings are each drawn from a Gaussian distribution, truncated to only nonnegative values. We plot the fidelity as a function of JSWAP to illustrate various effects, namely crosstalk due to coupling to other spins, as well as noise, that are detrimental to our ability to perform a SWAP operation. Our theory should be useful to the ongoing experimental efforts in building semiconductor-based spin quantum computer architectures.},
issn = {2469-9950},
doi = {10.1103/PhysRevB.102.035439},
author = {Throckmorton, Robert E. and Das Sarma, S.}
}
@article {ISI:000457058500007,
title = {Fractional Josephson effect with and without Majorana zero modes},
journal = {Phys. Rev. B},
volume = {99},
number = {3},
year = {2019},
month = {JAN 29},
pages = {035312},
publisher = {AMER PHYSICAL SOC},
type = {Article},
abstract = {It is known that the low-energy physics of the Josephson effect in the presence of Majorana zero modes exhibits a 4 pi periodicity as the Aharonov-Bohm flux varies in contrast to the 2 pi Josephson periodicity in usual superconducting junctions. We study this fractional Josephson effect in one-dimensional topological superconductors in Majorana nanowire systems by focusing on the features of the phase-energy relations in a superconducting semiconductor nanowire with spin-orbital coupling by including different factors operational in experimental systems, such as short wire length, suppression of superconducting gap, and the presence of an Andreev bound state. We show that even in the absence of the Majorana zero modes, some nontopological physical effects can manifest a 4 pi periodicity of the phase-energy relation in the Josephson junction, thus providing an alternative physics for fractional Josephson effect with no underlying Majorana zero modes. Furthermore, we consider several scenarios of inhomogeneous chemical potential distributions in the superconducting nanowire leading to four Majorana bound states and construct the effective four-Majorana model to correctly describe the low-energy theory of the Josephson effect. In this setup, multiple Majorana zero modes can also have the 4 pi fractional Josephson effect, although the underlying physics arises from Andreev bound states since two close-by Majorana bound states effectively form Andreev bound states. Our work demonstrates that the mere observation of a fractional Josephson effect simulating 4 pi periodicity might not, by itself, be taken as the definitive evidence for topological superconductivity. This finding has important implications for the ongoing search for non-Abelian Majorana zero modes and efforts for developing topological qubits.},
issn = {2469-9950},
doi = {10.1103/PhysRevB.99.035312},
author = {Chiu, Ching-Kai and S. Das Sarma}
}
@article { ISI:000446554000001,
title = {Failure of Kohn{\textquoteright}s theorem and the apparent failure of the f-sum rule in intrinsic Dirac-Weyl materials in the presence of a filled Fermi sea},
journal = {PHYSICAL REVIEW B},
volume = {98},
number = {15},
year = {2018},
month = {OCT 5},
pages = {155112},
issn = {2469-9950},
doi = {10.1103/PhysRevB.98.155112},
author = {Throckmorton, Robert E. and S. Das Sarma}
}
@article { ISI:000415568700001,
title = {Fast pulse sequences for dynamically corrected gates in singlet-triplet qubits},
journal = {PHYSICAL REVIEW B},
volume = {96},
number = {19},
year = {2017},
month = {NOV 17},
issn = {2469-9950},
doi = {10.1103/PhysRevB.96.195424},
author = {Throckmorton, Robert E. and Zhang, Chengxian and Yang, Xu-Chen and Wang, Xin and Barnes, Edwin and S. Das Sarma}
}
@article { ISI:000379647900004,
title = {Fast control of semiconductor qubits beyond the rotating-wave approximation},
journal = {PHYSICAL REVIEW A},
volume = {94},
number = {1},
year = {2016},
month = {JUL 14},
issn = {2469-9926},
doi = {10.1103/PhysRevA.94.012321},
author = {Song, Yang and Kestner, J. P. and Wang, Xin and S. Das Sarma}
}
@article { ISI:000333559400002,
title = {Ferromagnetic response of a {\textquoteleft}{\textquoteleft}high-temperature{{\textquoteright}{\textquoteright}} quantum antiferromagnet},
journal = {PHYSICAL REVIEW B},
volume = {89},
number = {12},
year = {2014},
month = {MAR 31},
pages = {121118},
issn = {1098-0121},
doi = {10.1103/PhysRevB.89.121118},
author = {Wang, Xin and Sensarma, Rajdeep and S. Das Sarma}
}
@article { ISI:000314683100005,
title = {Finite temperature inelastic mean free path and quasiparticle lifetime in graphene},
journal = {Phys. Rev. B},
volume = {87},
number = {8},
year = {2013},
month = {FEB 5},
issn = {1098-0121},
doi = {10.1103/PhysRevB.87.085406},
author = {Li, Qiuzi and S. Das Sarma}
}
@article { ISI:000286768100007,
title = {Fractional quantum Hall effects in bilayers in the presence of interlayer tunneling and charge imbalance},
journal = {PHYSICAL REVIEW B},
volume = {82},
number = {23},
year = {2010},
month = {DEC 9},
issn = {1098-0121},
doi = {10.1103/PhysRevB.82.235312},
author = {Peterson, Michael R. and Papic, Z. and S. Das Sarma}
}
@article { ISI:000274664500043,
title = {Fractional Quantum Hall State at nu=5/2 and the Moore-Read Pfaffian},
journal = {PHYSICAL REVIEW LETTERS},
volume = {104},
number = {7},
year = {2010},
month = {FEB 19},
issn = {0031-9007},
doi = {10.1103/PhysRevLett.104.076803},
author = {Storni, M. and Morf, R. H. and S. Das Sarma}
}
@article {Lee2010,
title = {F-wave pairing of cold atoms in optical lattices},
journal = {Phys. Rev. A},
volume = {82},
number = {5},
year = {2010},
month = {nov},
keywords = {2010, Single Fellow},
issn = {1050-2947},
url = {http://pra.aps.org/abstract/PRA/v82/i5/e053611},
author = {Lee, Wei-Cheng and Wu, Congjun and S. Das Sarma}
}
@article { ISI:000257424700054,
title = {Finite-layer thickness stabilizes the Pfaffian state for the 5/2 fractional quantum Hall effect: Wave function overlap and topological degeneracy},
journal = {PHYSICAL REVIEW LETTERS},
volume = {101},
number = {1},
year = {2008},
month = {JUL 4},
issn = {0031-9007},
doi = {10.1103/PhysRevLett.101.016807},
author = {Peterson, Michael. R. and Jolicoeur, Th. and S. Das Sarma}
}
@article {Wu2007,
title = {Flat Bands and Wigner Crystallization in the Honeycomb Optical Lattice},
journal = {Phys. Rev. Lett.},
volume = {99},
number = {7},
year = {2007},
month = {aug},
keywords = {2007, Single Fellow},
issn = {0031-9007},
url = {http://prl.aps.org/abstract/PRL/v99/i7/e070401},
author = {Wu, Congjun and Doron L. Bergman and Balents, Leon and S. Das Sarma}
}