Noncollinear magnetic phases and edge states in graphene quantum Hall bars

Application of a perpendicular magnetic field to charge neutral graphene is expected to result in a variety of broken symmetry phases, including antiferromagnetic, canted, and ferromagnetic. All these phases open a gap in bulk but have very different edge states and noncollinear spin order, recently confirmed experimentally. Here we provide an integrated description of both edge and bulk for the various magnetic phases of graphene Hall bars making use of a noncollinear mean field Hubbard model. Our calculations show that, at the edges, the three types of magnetic order are either enhanced (zigzag) or suppressed (armchair). Interestingly, we find that preformed local moments in zigzag edges interact with the quantum spin Hall like edge states of the ferromagnetic phase and can induce backscattering.

Catharine Waugh McCullouch papers in the Mary Earhart Dillon collection, 1869-1945

Collection primarily documents McCulloch's research on women's legal status, and her work with the Illinois Equal Suffrage Association, the National American Woman Suffrage Association, and the League of Women Voters. There is also documentation of women in the legal profession, of McCulloch's friendships with the other women suffragists and lawyers, and some biographical material. The papers contain little information about her family or social life.

Receipts related to the dispersal of the Croswell estate, 1785-1788

Seven handwritten receipts dated between 1785 and 1788.

Votes in Plimpton, 1788 April 7

Handwritten list of the votes cast for state government candidates in Plimpton, Massachusetts.

Copy of Andrew Croswell's executor's account, 1788 June 2

One-leaf account of the disbursements of the estate of Andrew Croswell presented to the judge of probate for Suffolk County, Massachusetts.

Payment order for Ebenezer Thayer, 1788 July 1

Handwritten order to John Sale to pay scholarship funds to Ebenezer Thayer for use by his son, signed by John Clarke, James Thwing, and Jacob Williams.

Letters from Daniel White to Andrew Hall, March 23, 1799

These two letters, both written on the same document, appear to be White's response to accusations from the father of one of his students at the Medford grammar school. Andrew Hall appears to have accused White of punishing his son too severely. In the letters, White denies Hall's accusations while defending his apparently strict approach to discipline. It is not certain whether both these letters were intended for Hall, or if one was written to another (unnamed) upset parent.

A Mourning Ditty: On the Conflagration of Harvard Hall in Cambridge New England. On the 24th Day of January 1764, [1764]

One-page handwritten copy of "A Mourning Ditty" signed "Philomusus Or A lover of the Muses"describing in a classical style the burning of Harvard Hall. The transcription is signed "Correctly Translated from the Printed Copy, by Peter Thacher." Thacher's translation is of the Latin poem "Threnodia" that appeared on the front page of the Massachusetts Gazette on February 2, 1764.

Prehistoric man, Hall of the Stone Age of the Old World / by Henry Field, Assistant Curator of Physical Anthropology. Foreword by Berthold Laufer -- 8 plates in photogravure and 1 map.

no.31(1933)

The races of mankind: an introduction to Chauncey Keep Memorial Hall / by Henry Field -- Preface by Berthold Laufer -- Introduction by Sir Arthur Keith -- 9 plates in photogravure and 1 plan of the Hall.

no.30(1933)

II. Butler bills, 1788-1794

The Butler's bills are printed quarterly bill forms that the Butler completed with his name, the name of the student, the specific quarter and its ending date, and the total owed for "permitted articles." In some years the form included a space to input the amount for "Wines and other permitted Liquors."

[Admittatur of Thomas Bartlett Hall], 1840 August 25

Printed copy of an undated abstract of laws and regulations with the admittatur of undergraduate Thomas B. Hall signed by President Josiah Quincy on August 25, 1840. The admittatur identifies Hall as a freshman.

[Certificate of admission of Thomas B. Hall], 1840 August 27

Printed copy of an undated abstract of laws and regulations with the admittatur of undergraduate Thomas Bartlett Hall to the Sophomore class on probation signed by President Josiah Quincy on August 27, 1840. The admittatur identifies Hall as a sophomore.